Water gas is produced by
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Solution
Which of the following types of forces bind together the carbon atoms in diamond ?
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Solution
In diamond each carbon atom is sp3 hybridized and thus forms covalent bonds with four other carbon atoms lying at the corners of a regular tetrahedron.
Ordinary glass is :
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Solution
Normal glass is calcium alkali silicate glass made by fusing the alkali metal carbonate, CaCO3 and SiO2.
Which of the following is a semiconductor ?
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Solution
Ge is used as a semiconductor in transistors.
In aqueous solution GaCl disproportionates to
Which one of the following exist in the oxidation state other than +3?
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Solution
Boron (B), aluminium (Al) and gallium (Ga) are present in group 13. They show + 3 oxidation state. While cerium (Ce) is a lanthanoid. It presents in lanthanide series. It shows + 3 and + 4 oxidation states.
Among the following the hardest is :
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Solution
Anthracite is a coal of hard variety burning with little flame & smoke. Graphite layers are held together by weak van der waal forces so it is very soft. Lignite is soft brown coal showing traces of plant structure,intermediate between coal &Peat. peat is vegetable matter decomposed in water and partly carbonized.
Aluminium chloride exists as dimer, (Al2Cl6) in solid state as well as in solution of non-polar solvents such as benzene.When dissolved in water, it gives
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Solution
Al2Cl6 + 12H2O ⟶ 2[Al(H2O)2]3+ + 6C1-
Boron halides behave as Lew is base, because of their :
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Solution
Boron halides behave as Lewis acid because of their electron deficient nature. Boron halide like BCl3 has only six electrons around Boron, which is less than required for octat rule.So it has a tendency to attract electron from others. Thus it behaves as an acid.
Which of the following statements about H3BO3 is not correct?
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Solution
H3BO3 is a weak mono basic acid.