datavorous/entrance-exam-dataset huggingface dataset:
Which of the following best explains why a horse cannot pull a cart and run in empty space?

Options:
A Newton's third law of motion states that every action has an equal and opposite reaction, so there's nothing for the horse to push against in empty space.
B Horses lack the necessary strength to pull a cart and run simultaneously.
C Empty space lacks the friction required for a horse to generate traction and pull a cart.
D Horses cannot maintain their balance while pulling a cart and running in the absence of a solid surface.

The correct answer is:
Newton's third law of motion states that every action has an equal and opposite reaction, so there's nothing for the horse to push against in empty space.

Solution:
Correct Option is : (A)
Newton's third law of motion states that every action has an equal and opposite reaction, so there's nothing for the horse to push against in empty space.

Topic: Chemistry, Laws of Motion, NEET
Which of the following best illustrates "feedback" in development?

Options:
A Tissue $\mathrm{X}$ secretes RNA which changes the development of tissue Y.
B As tissue $\mathrm{X}$ develops, it secretes enzymes that inhibit the development of tissue $Y$.
C As tissue $\mathrm{X}$ develops, it secretes something that induces tissue $\mathrm{Y}$ to develop.
D As tissue $\mathrm{X}$ develops, it secretes something that slows down the growth of tissue Y.

The correct answer is:
As tissue $\mathrm{X}$ develops, it secretes something that induces tissue $\mathrm{Y}$ to develop.

Solution:
As tissue $\mathrm{X}$ develops, it secrets something that induce tissue $\mathrm{Y}$ to develop indicating positive feedback mechanism.
Related Theory
Feedback mechanism is the mechanism of the body to maintain the levels of hormones in the body in the desired limits. An increase or decrease in the levels of the hormones triggers the feedback mechanism. Whenever there is a change in the normal state, the messages are sent to 'increase' secretions if there is a fall below normal or to 'decrease' secretions if there is a rise above normal to restore the normal body state. Such a mechanism is called a negative feedback mechanism.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2013 (Karnataka)
Which of the following biomolecules is common to respiration mediated breakdown of fats, carbohydrates, and proteins?

Options:
A Glucose - 6 - phosphate
B Fructose 1, 6 - bisphosphate
C Pyruvic acid
D Acetyl CoA

The correct answer is:
Acetyl CoA

Solution:
The organic substances which are oxidised to produce energy during respiration are called respiratory substrates. Carbohydrates are the main respiratory substrates as our food contains 65-70% carbohydrates. The most preferred substrate is glucose as it is the most available carbohydrate. Fats are used as the respiratory substrate in deficiency of carbohydrates. Proteins are rarely used as a respiratory substrate. (only in deficiency of carbohydrates and fats).When carbohydrates and fats are used as respiratory substrates, the process is called floating respiration.

When glucose is used as a respiratory substrate, it undergoes glycolysis. First glucose is converted to glucose-6-phosphate with the help of ATP and the enzyme hexokinase. Then through a series of reactions, it produces two molecules of pyruvic acid.

Pyruvic acid (pyruvate) undergoes oxidative decarboxylation in mitochondria to form acetyl co A in the presence of enzyme Pyruvate dehydrogenase and magnesium ions as co-factor. The hydrogen released during this reaction is accepted by coenzyme NAD+(Nicotinamide Adenine Dinucleotide) and it is reduced to form NADH2. This reaction is called link reaction or transition reaction or gateway reaction of aerobic respiration.

The acetyl co-A produced in the mitochondria undergoes TCA cycle to produce 3 molecules of NADH2, 1 molecule of FADH2, and 2 molecules of carbon dioxide

When fats are used as respiratory substrates, they are broken down into fatty acids and glycerol. Fatty acids undergo beta-oxidation to produce many acetyl co-A and thus enter TCA cycle. Glycerol which is also a breakdown product of fats, gets converted into Dihydroxy acetone phosphate (DHAP). DHAP isomerises to 3-PGAL and enters the glycolytic pathway.

When proteins are used as respiratory substrate, the process is called protoplasmic respiration. Proteins are broken down into amino acids. These amino acids undergo various chemical reactions are converted into pyruvic acid. This is converted to acetyl co-A which enters the TCA cycle.

Thus it is evident that, whatever may be the respiratory substrate it will ultimately enter the TCA cycle for generating energy.

Topic: Biology, Respiration in Plants, NEET, NEET 2016 (Phase 2)
Which of the following biphenyls is optically active?

Options:
A
B
C
D

The correct answer is:

Solution:
This molecule is optically active because this does not have the plane of symmetry due to restriction rotation around the bond, due to the large size atoms are attached to it.
It is optically active (Non super imposable on its mirror image)

Topic: Chemistry, General Organic Chemistry, JEE Main
Which of the following blood plasma proteins is correctly matched with its function?

Options:
A Albumin : Maintain water level and osmolarity of blood
B Globulin : Helps to provide antibody mediated immunity (AMI)
C Fibrinogen : Helps in coagulation of blood.
D All of these

The correct answer is:
All of these

Solution:
There are three main types of plasma proteins:

Albumin: It retains water level in plasma, therefore, maintains osmolarity.

Globulin: It is the protein of plasma as antibodies or immunoglobulin molecules that provide AMI.

Fibrinogen: This plasma protein is converted into fibrin threads by thrombin enzyme at the time of blood coagulation/clotting.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following bonds has the highest bond energy

Options:
A $\mathrm{Se}-\mathrm{Se}$
B $\mathrm{Te}-\mathrm{Te}$
C $S-S$
D $O-O$

The correct answer is:
$S-S$

Solution:
Bond energy:- "Bond energy is a measure of the bond strength of a chemical bond."
- It is the amount of energy required to break the atoms involved in a molecular bond into free atoms.
$\mathrm{S}-\mathrm{S}$ have the highest bond energy, which is due to lower size and less electron-electron repulsion. As on moving down the group, the size increases due to which the $M-M$ bond becomes weaker.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main
Which of the following Boolean expression is a tautology ?

Options:
A p∧q∨p∨q
B p∧q∨p→q
C p∧q∧p→q
D p∧q→p→q

The correct answer is:
p∧q→p→q

Solution:
p	q	p∧q	p→q	p∧q→p→q

T	T	T	T	T

T	F	F	F	T

F	T	F	T	T

F	F	F	T	T

p∧q→p→q is tautology

Topic: Mathematics, Mathematical Reasoning, JEE Main, JEE Main 2021 (16 Mar Shift 1)
Which of the following Boolean expressions is not a tautology?

Options:
A (p⇒q)∨(~q⇒p)
B (q⇒p)∨(~q⇒p)
C (p⇒~q)∨(~q⇒p)
D (~p⇒q)∨(~q⇒p)

The correct answer is:
(~p⇒q)∨(~q⇒p)

Solution:
1 (p⇒q)∨(~q⇒p)

By applying a⇒b≡~a∨b & ~~a=a, we get

=(~p∨q)∨(q∨p)

Since, the operation disjunction is commutative, hence, we have

=(~p∨q)∨(p∨q)

Now, applying the distributive law i.e. a∨b∨c≡a∨b∨a∨c, we get

=(~p∨p)∨q

Also, we know that ~a∨a≡t & t∨a≡t, where t represents tautology.

Thus, we have

=t∨q=t.

Hence, the option A is a tautology.

2 (q⇒p)∨(~q⇒p)

Again, using the same definitions, we get

=(~q∨p)∨(q∨p)

=(~q∨q)∨p

=t∨p=t.

Hence, the option B is also a tautology.

3 (p⇒~q)∨(~q⇒p)

=(~p∨~q)∨(q∨p)

=(~p∨p)∨(~q∨q)

=t∨t=t.

Hence, the option C is also a tautology.

4 (~p⇒q)∨(~q⇒p)

=(p∨q)∨(q∨p)

=(p∨q)∨(p∨q)

=p∨q.

Which is not a tautology.

Topic: Mathematics, Mathematical Reasoning, JEE Main, JEE Main 2021 (22 Jul Shift 1)
Which of the following can attack glass?

Options:
A \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
B \( \mathrm{HI} \)
C \( \mathrm{HCl} \)
D \( \mathrm{HF} \)

The correct answer is:
\( \mathrm{HF} \)

Solution:
Glass being a mixture of sodium and calcium silicates reacts with hydrofluoric (HF) and forming sodium and calcium fluorosilicates respectively. So, HF is not stored in glass vessels.

Na2SiO3+3H2F2→Na2SiF4+3H2OCaSiO3+3H2F2→CaSiF4+3H2O

The etching of glass is based on these reactions.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main
Which of the following can be represented by the configuration $[K r] 5 s^2$ ?

Options:
A $\mathrm{Ca}$
B $\mathrm{Sr}$
C $\mathrm{Ba}$
D $\mathrm{Ra}$

The correct answer is:
$\mathrm{Sr}$

Solution:
Correct option is $\mathrm{2} . \mathrm{Sr}$
Electronic Configuration of Strontium is Hence Option "2" is the correct answer

Topic: Chemistry, s Block Elements, JEE Main
Which of the following can be used to prevent the decomposition of H2O2?

Options:
A Urea
B Formaldehyde
C Formic acid
D Ethanol

The correct answer is:
Urea

Solution:
H2O2 decomposes slowly on exposure to light.
2H2O2l→2H2Ol+O2g
In the presence of metal surfaces or traces of alkali (present in glass containers), the above reaction is catalysed. It is, therefore, stored in wax-lined glass or plastic vessels in dark. Urea can be added as a stabiliser. It is kept away from dust because dust can induce explosive decomposition of the compound. Urea act as negative catalysts in the decomposition of hydrogen peroxide.

Topic: Chemistry, Hydrogen, JEE Main, JEE Main 2022 (26 Jul Shift 1)
Which of the following can convert acetic acid into ethanol?

Options:
A \( \mathrm{Sn} / \mathrm{HCl} \)
B \( \mathrm{H}_{2} / \mathrm{Pt} \)
C \( \mathrm{LiAlH}_{4} / \) ether
D \( \mathrm{Na} / \mathrm{alcohol} \)

The correct answer is:
\( \mathrm{LiAlH}_{4} / \) ether

Solution:
Acetic acid or ethanoic acid can be converted to ethanol by reduction. The strong reducing agent like LiAlH4 is used to do so.

Topic: Chemistry, Carboxylic Acid Derivatives, JEE Main
Which of the following can exhibit cis-trans isomerism

Options:
A $\mathrm{HC} \equiv \mathrm{CH}$
B $\mathrm{ClCH}=\mathrm{CHCl}$
C $\mathrm{CH}_3 \cdot \mathrm{CHCl} . \mathrm{COOH}$
D $\mathrm{ClCH}_2-\mathrm{CH}_2 \mathrm{Cl}$

The correct answer is:
$\mathrm{ClCH}=\mathrm{CHCl}$

Solution:
Correct option is (2). $\mathrm{ClCH}=\mathrm{CHCl}$
$\mathrm{ClCH}=\mathrm{CHCl}$ molecule can exhibit cis - trans isomerism.

Topic: Chemistry, General Organic Chemistry, JEE Main
Which of the following can give iodoform test ?

(I) CH 3 - C O || - CH 2 - C O || - CH 3

(II) C 6 H 5 - CH 2 - C O || - CH 3

(III) CH 3 - CHO

(IV) C 6 H 5 - C O || - CH 3

Options:
A Only IV
B II and IV
C III and IV
D All of these

The correct answer is:
All of these

Solution:
Anything that has group gives positive iodoform

Topic: Chemistry, Aldehydes and Ketones, JEE Main
Which of the following can lead to infertility in males?

Options:
A Any kind of reproductive tract infection like filariasis
B Undersecretion of hormones like FSH and adrenaline
C Improper structure of sperm produced in Leydig cells
D Damaged to accessory duct

The correct answer is:
Damaged to accessory duct

Solution:
CAUSES OF INFERTILITY IN MALES:

1) Hyposecretion of gonadotropic hormones FSH and LH.

2) Improper development of sex organs.

3) Bacterial or viral infections in the sex organs or STDs.

4) Damage or blockage of vas-deferens.

5) Oligospermia: Less sperm count in ejaculated semen, i.e., less than 20 millions sperms.

6) Azoospermia: Absence of motile sperms in the semen.

7) Asthenozoospermia: It is a condition of sperms without tail.

8) Impotency: Inability to have or maintain erection of penis.

9) Production of abnormal sperms.

10) Round-headed sperm is produced due to the Golgi apparatus not transformed into acrosomes.

11) Any damage or hyposecretion from secretory ducts results in reduced fertilization due to reduced movement of sperms in the acidic environment of the uterus.

12) Early ejaculation (discharge of semen before insertion of the penis into the vagina).

Topic: Biology, Reproductive Health, NEET
Which of the following can not be made by reduction of ketone or aldehyde with NaBH4?

Options:
A 1-Butanol
B 2-Butanol
C 2-Methyl-1-propanol
D 2-Methyl-2-propanol

The correct answer is:
2-Methyl-2-propanol

Solution:
2-methyl-2-propanol is OH CH 3 - C | | - CH 3 CH 3 .
It can not be obtained by reduction of an aldehyde or ketone with NaBH4.

Topic: Chemistry, Aldehydes and Ketones, JEE Main
Which of the following can participate in linkage isomerism?

Options:
A $\mathrm{NO}_{2} \quad$
B $\mathrm{H}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}$
C $\mathrm{H}_{2} \mathrm{O}$
D $: \mathrm{NH}_{3}$

The correct answer is:
$\mathrm{NO}_{2} \quad$

Solution:
Linkage isomerism can be shown by compound containing ambidentate ligand. $\mathrm{In} \mathrm{NO}_{2}, \mathrm{NO}_{2}$ can bind either by $N$ or by $O$.
e.g. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)\right] \mathrm{Cl}_{2}$ (yellow) and $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{ONO}_{\mathrm{Y}} \mathrm{Cl}_{2}\right.$ (blue)

Topic: Chemistry, Coordination Compounds, JEE Main
Which of the following can possibly be used as analgesic without causing addiction and modification?

Options:
A Morphine
B N-Acetyl-para-aminophenol
C Diazepam
D Tetrahydrocatenol

The correct answer is:
N-Acetyl-para-aminophenol

Solution:
N-acetyl-para-aminophenol can be used as an analgesic without causing addiction and modification.It is non-narcotic analgesic. Rest all can cause addiction and modification.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which of the following can reduce decomposition of H2O2 on exposure to light

Options:
A Urea
B Alkali
C Glass containers
D Dust

The correct answer is:
Urea

Solution:
H2O2 decomposes on exposure to sunlight or on heating. It also decomposes on standing but at a slow rate. These reactions occur explosively when H2O2 is in contact with dust. Urea acts as a negative catalyst to this reaction and slow down the decomposition of hydrogen peroxide.

Topic: Chemistry, Hydrogen, JEE Main, JEE Main 2023 (08 Apr Shift 2)
Which of the following can show positive deviation from Raoult's law?

Options:
A Water-hydrochloric acid
B Water-nitric acid
C Benzene-methanol
D Acetone-chloroform

The correct answer is:
Water-nitric acid

Solution:
In solution showing positive type of deviation the partial pressure of solution is greater than the vapour pressure as expected according to Raoult's law. In solution of methanol & benzene methanol molecules are held together due to hydrogen bonding as shown below. On adding benzene, the benzene molecules get in between the molecule of methanol thus breaking the hydrogen bonds. As the resulting solution has weak intermolecular attraction, the escaping tendency of alcohol and benzene molecule from the solution increases. Consequently the vapour pressure of the solution is greater than the vapour pressure as expected from Raoult's law.

Topic: Chemistry, Solutions, JEE Main
Which of the following cannot act as a Lewis or Bronsted acid

Options:
A $B F_3$
B $\mathrm{AlCl}_3$
C $\mathrm{SnCl}_4$
D $\mathrm{CCl}_4$

The correct answer is:
$\mathrm{CCl}_4$

Solution:
$\mathrm{CCl}_4$ is not a Lewis or bronsted acid. It does not contain $\mathrm{H}^{+}$.

Topic: Chemistry, Ionic Equilibrium, JEE Main
Which of the following cannot act both as Bronsted acid and as Bronsted base?

Options:
A $\mathrm{HCO}_3^{-}$
B $\mathrm{NH}_3$
C $\mathrm{HCl}$
D $\mathrm{HSO}_4^{-}$

The correct answer is:
$\mathrm{HCl}$

Solution:
Key Idea Bronsted acid is a substance which has a tendency to donate proton. Bronsted base is a substance which has a tendency to accept proton.
HCl can act as Bronsted acid becuase it can only donate proton.
$$
\mathrm{HCl}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{H}_3 \mathrm{O}^{+}+\mathrm{Cl}^{-}
$$
The remaining options contains substances which act both as Bronsted acid and Bronsted base.
$$
\begin{aligned}
\mathrm{HCO}_3^{-}+\mathrm{HCO}_3^{-} & \rightleftharpoons \mathrm{H}_2 \mathrm{CO}_3+\mathrm{CO}_3^{2-} \\
\mathrm{NH}_3+\mathrm{NH}_3 & \rightleftharpoons \mathrm{NH}_4^{+}+\mathrm{NH}_2^{-} \\
\mathrm{HSO}_4^{-}+\mathrm{HSO}_4^{-} & \rightleftharpoons \mathrm{H}_2 \mathrm{SO}_4+\mathrm{SO}_4^{2-}
\end{aligned}
$$
Thus, option (3) is correct.

Topic: Chemistry, Ionic Equilibrium, NEET, NEET 2019 (Odisha)
Which of the following cannot be emitted by radioactive substances during their decay?

Options:
A
Protons

B
Neutrinoes

C
Helium nuclei

D
Electrons

The correct answer is:
Protons

Solution:
No Solution Available

Topic: Physics, Nuclear Physics, JEE Main, JEE Main 2003
Which of the following cannot be explained by crystal field theory?

Options:
A The order of spectrochemical series
B Magnetic properties of transition metal complexes
C Colour of metal complexes
D Stability of metal complexes

The correct answer is:
The order of spectrochemical series

Solution:
The crystal field model is successful in explaining the formation, structures, colour and magnetic properties of coordination compounds to a large extent. However, from the assumptions that the ligands are point charges, it follows that anionic ligands should exert the greatest splitting effect. The anionic ligands actually are found at the low end of the spectrochemical series. So, it couldn't explain successfully the order of spectrochemical series.

Topic: Chemistry, Coordination Compounds, JEE Main, JEE Main 2023 (24 Jan Shift 2)
Which of the following cannot be hydrolysed

Options:
A A salt of weak acid and strong base
B A salt of strong acid and weak base
C A salt of weak acid and weak base
D A salt of strong acid and strong base

The correct answer is:
A salt of strong acid and strong base

Solution:
A salt of strong acid and strong base cannot be hydrolysed. In this case the equilibrium cannot shifted towards the backward.

Topic: Chemistry, Ionic Equilibrium, JEE Main
Which of the following cannot be oxidized by $\mathrm{H}_2 \mathrm{O}_2$

Options:
A $\mathrm{O}_3$
B $\mathrm{KI} / \mathrm{HCl}$
C $\mathrm{PbS}$
D $\mathrm{Na}_2 \mathrm{SO}_3$

The correct answer is:
$\mathrm{O}_3$

Solution:
$\mathrm{H}_2 \mathrm{O}_2$ reduces $\mathrm{O}_3$ to $\mathrm{O}_2$
$\mathrm{O}_3+\mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{H}_2 \mathrm{O}+2 \mathrm{O}_2$

Topic: Chemistry, Hydrogen, JEE Main
Which of the following cannot be represented by resonance structures?

Options:
A
Dimethyl ether

B
Nitrate anion

C
Carboxylate anion

D
Toluene

The correct answer is:
Dimethyl ether

Solution:
Ethers due to absence of delocalized pair of electrons do not show resonance.

Topic: Chemistry, General Organic Chemistry, JEE Main, JEE Main 2012 (07 May Online)
Which of the following cannot function as an oxidising agent?

Options:
A N3-
B SO42-
C BrO3-
D MnO4-

The correct answer is:
N3-

Solution:
An oxidising agent is a substance that oxidises other substances involved in the reaction by gaining or accepting electrons from them.

So the lowest oxidation state substance will go to the higher oxidation state, which means it reduces others. Hence, it acts as a reducing agent. -3 is the lowest oxidation state for nitrogen. Hence, it only acts as a reducing agent.

Hence option A is the answer.

Topic: Chemistry, Redox Reactions, JEE Main, JEE Main 2024 (27 Jan Shift 2)
Which of the following cannot give Cannizzaro reaction?

Options:
A
B
C
D

The correct answer is:

Solution:
Here CCl3CHO cannot give Cannizzaro reaction due to good LG nature of CCl3⊝.
All other can show Cannizzaro reaction as don't have α -H-atom.

Topic: Chemistry, Aldehydes and Ketones, JEE Main
Which of the following can't be taken as the character/function of the Sertoli cell?

Options:
A Release of ABP
B Contribute to major part of semen
C Nourishment to spermatids
D Formation of blood testes barrier

The correct answer is:
Contribute to major part of semen

Solution:
Sertoli cells are nurse cells or sustentacular cells present in the testes. These are present inbetween the spermatogonia. These cells are nurse cells as they provide nourishment to the developing sperms. Apart from this, they have many other functions. These cells also bring about release of Androgen binding protein (ABP) whch binds with the testosterone. These cells also form the blood testis barrier that helps to maintain luminal environment for sperm production. Semen is a mixture of Sperms and Secretions of accessory glands. Sertoli cells do not contribute to the formation of semen.

Topic: Biology, Human Reproduction, NEET
Which of the following carbocations is most stable:

Options:
A

B

C

D

The correct answer is:

Solution:
All these carbocations are stabilised by resonance. But the one which has maximum conjugation or maximum resonating structures will be most stable.

Is most stable carbocation since it has maximum conjugation and also it is stabilised due to mesomeric effect of methoxy group.

Topic: Chemistry, General Organic Chemistry, JEE Main, JEE Main 2022 (29 Jun Shift 2)
Which of the following carbonyls will have the strongest $\mathrm{C}-\mathrm{O}$ bond?

Options:
A $\operatorname{Mn}(\mathrm{CO})_6^{+}$
B $\mathrm{Cr}(\mathrm{CO})_6$
C $\mathrm{V}(\mathrm{CO})_6^{-}$
D $\mathrm{Fe}(\mathrm{CO})_5$

The correct answer is:
$\operatorname{Mn}(\mathrm{CO})_6^{+}$

Solution:
As positive charge on the central metal atom increases, the less readily the metal can donate electron density into the anti bonding $\pi$-orbitals of CO ligand to weaken the $\mathrm{C}-\mathrm{O}$ bond. Hence, the $\mathrm{C}-\mathrm{O}$ bond would be strongest in $\mathrm{Mn}(\mathrm{CO})_6^{+}$.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2011 (Mains)
Which of the following carboxylic acids is most reactive towards esterification?

Options:
A CH33CCOOH
B CH32CHCOOH
C CH3CH2COOH
D C2H52CHCOOH

The correct answer is:
CH3CH2COOH

Solution:
\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) is most reactive towards esterification as \(\mathrm{C}\) atom of carboxylic group is stericaly least hindered. Greater is the steric hinderance, lower is the reactivity.

Topic: Chemistry, Carboxylic Acid Derivatives, JEE Main
Which of the following cationic detergents?

Options:
A Sodium lauryl sulphate.
B Cetyl trimethyl ammonium bromide.
C Sodium dodecylbenzene sulphonate.
D Glyceryl oleate

The correct answer is:
Cetyl trimethyl ammonium bromide.

Solution:
In cationic detergents, the long chain part is a cation which is responsible for the surface action.
Cetyltrimethyl ammonium bromide is a cationic detergent.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which of the following cations has the strongest tendency towards complex formation?

Options:
A Sm3+
B Lu3+
C Gd3+
D Yb3+

The correct answer is:
Lu3+

Solution:
Lu3+ having smaller size and the highest effective nuclear charge will form complexes easily.

Topic: Chemistry, d and f Block Elements, JEE Main
Which of the following causes soap to lather?

Options:
A Sodium carbonate
B Sodium rosinate
C Sodium silicate
D Borax

The correct answer is:
Sodium rosinate

Solution:
Rosin is a chemical compound which is a gum that is added while making soaps. During saponification, it forms sodium rosinate which forms lathers.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which of the following cell organelles is associated with photorespiration?

Options:
A Mitochondria
B Peroxysome
C Chloroplast
D All of these

The correct answer is:
All of these

Solution:
Photorespiration ( $\mathrm{C}_2$-cycle) is a special type of respiration shown by many green plants ( $\mathrm{C}_3$-plants) when they are exposed to light. It is a light dependent process during, which $\mathrm{O}_2$ is used and $\mathrm{CO}_2$ is released. The process of photorespiration takes place only in chlorophyllous tissues of plants. Therefore, the main site for photorespiration is chloroplast. But mitochondria and peroxysomes are also required to complete the process.

Topic: Biology, Photosynthesis in Higher Plants, JIPMER, JIPMER 2012