Problem 39
A mixture of carbon monoxide, hydrogen and hydrocarbons is known as: (a) Producer gas (b) Water gas (c) Semi water gas (d) Carbureted water gas
Problem 40
Formula for tear gas is: (a) \(\mathrm{N}_{2} \mathrm{O}\) (b) \(\mathrm{COCl}_{2}\) (c) \(\mathrm{Cl}_{3} \mathrm{NO}_{3}\) (d) none of these
Problem 41
The molecule having zero dipole moment is: (a) \(\mathrm{CCl}_{4}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{HCl}\) (d) \(\mathrm{CHCl}_{2}\)
Problem 42
Glass reacts with HF to produce: (a) \(\mathrm{H}_{2} \mathrm{SiF}_{6}\) (b) \(\mathrm{Na}_{3} \mathrm{AlF}_{6}\) (c) \(\mathrm{H}_{2} \mathrm{SiO}_{3}\) (d) \(\mathrm{SiF}_{4}\)
Problem 42
During the electrolytic reduction of alumina, the reaction at cathode is \(\ldots \ldots\) (a) \(3 \mathrm{~F}^{*} \rightarrow 3 \mathrm{~F}+3 \mathrm{e}^{-}\) (b) \(2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2}\) (c) \(2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+\overline{4} \mathrm{H}^{+}+4 \mathrm{e}^{-}\) (d) \(\mathrm{Al}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Al}\)
Problem 43
Boron compounds behave as lewis acids because of their (a) Ionisation energy (b) Electron deficient nature (c) Covalent nature (d) Ionisation energy
Problem 43
When steam is passed through red hot coke: (a) \(\mathrm{CO}\) and \(\mathrm{N}_{2}\) are formed (b) \(\mathrm{CO}_{2}\) and \(\mathrm{H}_{2}\) are formed (c) Petrol gas is obtained (d) \(\mathrm{CO}\) and \(\mathrm{H}_{2}\) are formed
Problem 44
Carbon dioxide is used for extinguishing fire because: (a) It is a colourless gas (b) It is neither combustile nor a supporter of combution (c) It has a relatively high critical temperature (d) In solid state, it is called dry ice
Problem 44
Boron halides behave as Lewis acids because they (a) Have only six electron in the valence shell (b) Have a lone pair of electrons on the \(\mathrm{B}\) atom (c) Are covalent compounds (d) Are ionic compounds
Problem 45
What is the compound formed when acetaldehyde is reacted with \(\operatorname{LiAlH}_{4} ?\) (a) \(\mathrm{CH}_{3} \mathrm{COOH}\) (b) \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) (d) \(\mathrm{C} 2 \mathrm{H}_{5} \mathrm{OC}_{2} \mathrm{H}_{5}\)
