Problem 12
\(\mathrm{D}_{2} \mathrm{O}\) is used in/as: (a) Insecticide (b) Industry (c) Medicine (d) Nuclear reactor
Problem 13
A variety of water which contains soluble salts of Ca and \(\mathrm{Mg}\) is known as: (a) Soft water (b) Heavy water (c) Conductivity water (d) Hard water
Problem 14
The boiling point of water is exceptionally high because: (a) There is covalent bond between \(\mathrm{H}\) and \(\mathrm{O}\) (b) Water molecule is not linear (c) Water molecule is linear (d) Water molecules associate due to hydrogen bonding
Problem 15
The process used for the removal of hardness of water is: (a) Baeyer (b) Hoope (c) Calgon (d) Serpeck
Problem 16
The metal that cannot displace hydrogen from diluted \(\mathrm{HCl}\) is: (a) \(\mathrm{Fe}\) (b) \(\mathrm{Cu}\) (c) \(\mathrm{Zn}\) (d) \(\mathrm{Mg}\)
Problem 17
Hydride ion: (a) Is a strong conjugate base of \(\mathrm{H}_{2}\) (b) Is a strong conjugate acid of \(\mathrm{H}_{2}\) (c) Is a strong conjugate base of \(\mathrm{H}^{-}\) (d) Is a strong conjugate acid of \(\mathrm{H}^{+}\)
Problem 18
Aluminium reacts with concentrated HCl and concentrated \(\mathrm{NaOH}\) to liberate the gases \(\ldots \ldots\). respectively. (a) \(\mathrm{H}_{2}\) and \(\mathrm{H}_{2}\) (b) \(\mathrm{O}_{2}\) and \(\mathrm{O}_{2}\) (c) \(\mathrm{O}_{2}\) and \(\mathrm{H}_{2}\) (d) \(\mathrm{H}_{2}\) and \(\mathrm{O}_{2}\)
Problem 19
\(\mathrm{NH}_{3}\) and \(\mathrm{H}_{2} \mathrm{O}\) form \(\mathrm{NH}_{4} \mathrm{OH}\) by: (a) Covalent bond (b) Coordinate bond (c) Electrovalent bond (d) None of these
Problem 22
The \(\mathrm{H}-\mathrm{O}-\mathrm{H}\) angle in water molecule is about: (a) \(90^{\circ}\) (b) \(105^{\circ}\) (c) \(135^{\circ}\) (d) \(180^{\circ}\)
Problem 23
Which group element of d-block do not form hydride at all? (a) 7 (b) 9 (c) 8 (d) All of these
