Problem 63
In laboratory burners, we use: (a) Coal gas (b) Oil gas (c) Gobar gas (d) Producer gas
Problem 63
Which of the following does not form ionic compound easily? (a) Thalium (b) Aluminium (c) Boron (d) Galium
Problem 64
\(\mathrm{BF}_{3}\) used as a catalyst in several industrial processes due to its (a) Weak reducing action (b) Strong reducing nature (c) Weak lewis acid character (d) Reducing nature
Problem 64
Tungsten carbide is an example of: (a) Passive solid solution (b) Interstitial solid solution (c) Sandwich solid solution (d) Substitutional solid solution
Problem 65
Silicons are: (a) Water repelling in nature (b) With high dielectric strength (c) With high thermal stability (d) All of these
Problem 65
Boron and silicon resembles in all respects except (a) Both form halides which are Lewis acids (b) Their chlorides hydrolyse to their respectively acids (c) Both form acidic oxides (d) Their hydrates are stable
Problem 66
Which is strongest Lewis acid? (a) \(\mathrm{BBr}_{3}\) (b) \(\mathrm{BI}_{3}\) (c) \(\mathrm{BF}_{3}\) (d) \(\mathrm{BCl}_{3}\)
Problem 67
Ga is below \(\mathrm{Al}\) in the periodic table, but atomic radius of Ga is less than Al. It is because of (a) Lanthanoid contraction (b) Greater screening effect (c) Inert pair effect (d) None of these
Problem 67
Which of the following pairs liberate a gas when they react with each other: (a) \(\mathrm{Mg}, \mathrm{B}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{Mg}, \mathrm{CO}_{2}\) (c) Fused \(\mathrm{NaOH}, \mathrm{C}\) (d) \(\mathrm{SiO}_{2}, \mathrm{Na}\)
Problem 68
Coal gas is a mixture of: (a) \(\mathrm{H}_{2}\) saturated and unsaturated hydrocarbons \(\mathrm{CO}\), \(\mathrm{CO}_{2}, \mathrm{~N}_{2}\) and \(\mathrm{O}_{2}\) (b) \(\mathrm{CO}\) and \(\mathrm{H}_{2}\) (c) \(\mathrm{CO}, \mathrm{CO}_{2}, \mathrm{CH}_{4}\) (d) Saturated and unsaturated hydrocarbons:
