Problem 1
Metal hydride on treatment with water gives (a) hydrogen (b) acid (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\)
Problem 2
Hydrogen from HCl can be prepared by (a) \(\mathrm{P}\) (b) \(\mathrm{Mg}\) (c) \(\mathrm{Hg}\) (d) \(\mathrm{Cu}\)
Problem 3
Hydrogen will not reduce (a) heated cupric oxide (b) heated ferric oxide (c) heated stannic oxide (d) heated aluminium oxide
Problem 4
Reaction of potassium with water is (a) hydrolysis (b) absorption (c) exothermic (d) endothermic
Problem 5
A metal which does not liberate \(\mathrm{H}_{2}(\mathrm{~g})\) from acids is (a) \(\mathrm{Fe}\) (b) \(\mathrm{Zn}\) (c) \(\mathrm{Mn}\) (d) \(\mathrm{Cu}\)
Problem 6
Which gas is liberated, when alkaline formaldehyde solution is treated with \(\mathrm{H}_{2} \mathrm{O}_{2} ?\) (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{O}_{2}\)
Problem 7
Ortho and para hydrogen differ (a) in the molecular weight (b) in the number of protons (c) in the nature of spin of electrons (d) in the nature of spin of protons
Problem 8
Hydrogen burns in air or oxygen with (a) invisible pale blue flame (b) red flame (c) golden flame (d) blue flame
Problem 10
Which of the following cannot be oxidized by \(\mathrm{H}_{2} \mathrm{O}_{2} ?\) (a) \(\mathrm{O}_{3}\) (b) \(\mathrm{PbS}\) (c) \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) (d) \(\mathrm{Kl}+\mathrm{HCl}\)
Problem 12
There are three isotopes of hydrogen and three naturally occurring isotopes of oxygen \(\left(\mathrm{O}^{16}, \mathrm{O}^{17}\right.\) and \(\mathrm{O}^{18}\) ). How many kinds of water are possible? (a) 9 (b) 16 (c) 8 (d) 18
