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) \(\mathrm{C} 2 \mathrm{H}_{5} \mathrm{OC}_{2} \mathrm{H}_{5}\)
Problem 46
Aluminium reacts with hot concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to liberate (a) \(\mathrm{S}\) (b) \(\mathrm{SO}_{3}\) (c) \(\mathrm{SO}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{~S}\)
Problem 46
The ability of a substances to assume two or more crystalline structures is called: (a) Amorphism (b) Diamondl (c) Graphite (d) None
Problem 47
The shape of tetrahalides of group 14 elements is: (a) Tetrahedral (b) Octahedral (c) Trigonal bipyramid (d) Square planar
Problem 47
Which of the following is not a Lewis acid? (a) \(\mathrm{AlCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{SnCl}_{4}\) (c) \(\mathrm{FeCl}_{3}\) (d) \(\mathrm{AlCl}_{3}\)
Problem 48
Maximum ability of catenation is shown by: (a) Sulphur (b) Nitrogen (c) Oxygen (d) Carbon
Problem 48
Aluminium oxide is not reduced by chemical reactions since (a) Reducing agent contaminates (b) The process pollutes the environment (c) Aluminium oxide is highly stable (d) Aluminium oxide is stable
Problem 49
Lead and tin are extracted from their chief ores by: (a) Electrolysis and self reduction (b) Carbon reduction and self reduction (c) Self reduction and carbon reduction (d) Self reduction and electrolysis.
Problem 50
Which of the following is used in the preparation of aerated water (soda)? (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{HCl}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{CO}\)
Problem 51
Silicon has the characteristics of a: (a) Non metal (b) Metalloid (c) Metal (d) None of these
