Ques:Information: - Ali Babba bin Bello ( 1804 -- 1859 ) was the fourth Sultan of the Sokoto Caliphate from 1842 to 1859 . Ali bin Bello is known by a variety of different names in different sources , including : Ali bin Bello , Aliyu Babba ( not to be confused with his grandson and namesake , the Emir of Kano from 1894 - 1903 with the same name ) , and Mai Cinaka . - Shaihu Usman dan Fodio, born Usuman ii Foduye, (also referred to as Shaikh Usman Ibn Fodio, Shehu Uthman Dan Fuduye, Shehu Usman dan Fodio or Shaikh Uthman Ibn Fodio) (1754, Gobir 1817, Sokoto) was a religious teacher, writer and Islamic promoter, and the founder of the Sokoto Caliphate. Dan Fodio was one of a class of urbanized ethnic Fulani living in the Hausa States in what is today northern Nigeria. He was a leader who followed the Sunni Maliki school of Jurisprudence and the Qadiri branch of Sufism. - West Africa, also called Western Africa and the West of Africa, is the westernmost subregion of Africa. West Africa has been defined as including 18 countries: Benin, Burkina Faso, the island nation of Cape Verde, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, the island of Saint Helena, Senegal, Sierra Leone, Sao Tome and Principe and Togo. - The Fulani Jihad of 18041808, also known as the Fulani War or Jihad of Usman dan Fodio, was a military contest in present-day Nigeria and Cameroon. The war began when Usman dan Fodio, a prominent Islamic scholar and teacher, was exiled from Gobir by the king Yunfa, one of his former students. - Northern Nigeria was a British protectorate which lasted from 1900 until 1914 and covered the northern part of what is now Nigeria. - The Sokoto Caliphate was an independent Islamic Caliphate, in West Africa. Founded during the jihad of the Fulani War in 1809 by Usman dan Fodio, it was abolished when the British defeated the caliph in 1903 and put the area under the Northern Nigeria Protectorate. - Sokoto is a city located in the extreme northwest of Nigeria, near the confluence of the Sokoto River and the Rima River. As of 2006 it has a population of 427,760. Sokoto is the modern-day capital of Sokoto State (and its predecessor, the north-western State). Given the information above, choose from the list below the object entity that exhibits the relation 'date of birth' with the subject 'ali babba bin bello'. Choices: - 1754 - 18 - 1804 - 1808 - 1809 - 1900 - 1903 - 1914 - 2006 - 427 - 760

Ans:1808
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Ques:Information: - Anhydrite is a mineralanhydrous calcium sulfate, CaSO. It is in the orthorhombic crystal system, with three directions of perfect cleavage parallel to the three planes of symmetry. It is not isomorphous with the orthorhombic barium (baryte) and strontium (celestine) sulfates, as might be expected from the chemical formulas. Distinctly developed crystals are somewhat rare, the mineral usually presenting the form of cleavage masses. The Mohs hardness is 3.5 and the specific gravity is 2.9. The color is white, sometimes greyish, bluish, or purple. On the best developed of the three cleavages, the lustre is pearly; on other surfaces it is glassy. When exposed to water, anhydrite readily transforms to the more commonly occurring gypsum, (CaSO2HO) by the absorption of water. This transformation is reversible, with gypsum or calcium sulfate hemihydrate forming anhydrite by heating to around under normal atmospheric conditions. Anhydrite is commonly associated with calcite, halite, and sulfides such as galena, chalcopyrite, molybdenite, and pyrite in vein deposits. - Baryte or barite ( BaSO4 ) is a mineral consisting of barium sulfate . The baryte group consists of baryte , celestine , anglesite and anhydrite . Baryte is generally white or colorless , and is the main source of barium . Baryte and celestine form a solid solution ( Ba , Sr ) SO4 . - Solid is one of the four fundamental states of matter (the others being liquid, gas, and plasma). It is characterized by structural rigidity and resistance to changes of shape or volume. Unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire volume available to it like a gas does. The atoms in a solid are tightly bound to each other, either in a regular geometric lattice (crystalline solids, which include metals and ordinary ice) or irregularly (an amorphous solid such as common window glass). - Molybdenite is a mineral of molybdenum disulfide, MoS. Similar in appearance and feel to graphite, molybdenite has a lubricating effect that is a consequence of its layered structure. The atomic structure consists of a sheet of molybdenum atoms sandwiched between sheets of sulfur atoms. The Mo-S bonds are strong, but the interaction between the sulfur atoms at the top and bottom of separate sandwich-like tri-layers is weak, resulting in easy slippage as well as cleavage planes. Molybdenite crystallizes in the hexagonal crystal system as the common polytype 2H and also in the trigonal system as the 3R polytype. - A solid solution is a solid-state solution of one or more solutes in a solvent. Such a mixture is considered a solution rather than a compound when the crystal structure of the solvent remains unchanged by addition of the solutes, and when the mixture remains in a single homogeneous phase. This often happens when the two elements (generally metals) involved are close together on the periodic table; conversely, a chemical compound generally results when two metals involved are not near each other on the periodic table. Given the information above, choose from the list below the object entity that exhibits the relation 'crystal system' with the subject 'baryte'. Choices: - amorphous solid - hexagonal crystal system - orthorhombic crystal system

Ans:
orthorhombic crystal system
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