Water gas is produced by

passing steam through a red hot coke bed
saturating hydrogen with moisture
mixing oxygen and hydrogen in the ratio of 1: 2
heating a mixture of CO₂ and CH₄ in petroleum refineries.

Solution

Which of the following types of forces bind together the carbon atoms in diamond ?

Ionic
Covalent
Dipolar
Van der Waals.

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 :

Sodium silicate
Calcium silicate
Sodium and calcium silicate
Mixed salt of Na and Ca

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 ?

Solution

Ge is used as a semiconductor in transistors.

In aqueous solution GaCl disproportionates to

GaCl₂ and GaCl₃
Ga and GaCl₃
GaCl₂ and Ga
GaCl₃ and GaCl₅

Which one of the following exist in the oxidation state other than +3?

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 :

Peat
Lignite
Graphite
Anthractie

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

[Al(OH)₆]^3- + 3HCl
[Al(H₂O)₆]³⁺ + 3Cl^-
Al³⁺ + 3Cl^-
Al₂O₆ + 6HCl

Solution

Al₂Cl₆ + 12H₂O ⟶ 2[Al(H₂O)₂]³⁺ + 6C1^-

Boron halides behave as Lew is base, because of their :

ionic nature
acidic nature
covalent nature
electron deficient nature

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?

It is a strong tribasic acid
It is prepared by acidifying an aqueous solution of borax
It has a layer structure in which planar BO₃ units are joined by hydrogen bonds
It does not act as proton donor but acts as a Lew is acid by accepting a lone pair of electrons

Solution

H₃BO₃ is a weak mono basic acid.

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