Objective question
Channel: Doubtnut
Date: 05/07/2020

Objective question .  i. A certains compound has the molecular formula `X_(4) O_(6)`. If `10 g of X_(4) O_(6)` has `5.72 g X`, then atomic mass of `X` is: a. 32 amu    b. 42 amu     c. 98 amu     d. 37 amu  ii. For 109% labelled oleum, if the number of moles of `H_(2)SO_(4)` and free `SO_(3)` be `p` and `q`, respectively, then what will be the value of `(p - q)/(p + q)` a. `1//9`     b. 9       c. 18      d. `1//3`  iii. Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation, `2H_(2) O_(2) (aq) rarr 2 H_(2) O (l) + O_(2) (g)`  Under conditions where 1 mol gas occupies `24 dm^(3), 100 cm^(3)` of `X M` solution of `H_(2) O_(2)` produces `3 dm^(3)` of `O_(2)`. Thus, `X` is  a. 2.5      b. 0.5       c. 0.25     d. 1  iv. `4 g` of sulphur is burnt to form `SO_(2)` which is oxidised by `Cl_(2)` water. The solution is then treated with `BaCl_(2)` solution. The amount of `BaSO_(4)` precipitated is:  a. 0.24 mol      b. 0.5 mol  c. 1 mol          d. 0.125 molv. A reaction occurs between 3 moles of `H_(2)` and 1.5 moles of `O_(2)` to give some amount of `H_(2) O`. The limiting reagent in this reaction is  a. `H_(2)` and `O_(2)` both         b. `O_(2)`  c. `H_(2)`       d. Neither of them  vi. `4 I^(ɵ) + Hg^(2+) rarr HgO_(4)^(-)`, 1 mole each of `Hg^(2+)` and `I^(ɵ)` will form:  a. 1 mol of `HgI_(4)^(2-)`  b. 0.5 mol of `HgI_(4)^(-2)`  0.25 mol of `HgI_(4)^(2-)`  2 mol of `HgI_(4)^(-2)`