Problem 16
Which of the following compound react with \(\mathrm{BF}_{3} ?\) (a) \(\mathrm{Al}_{2} \mathrm{Cl}_{6}\) (b) \(\mathrm{NH}_{3}\) (c) Ethers (d) All of these
Problem 16
CO forms a volatile compound with: (a) Copper (b) Nickel (c) Aluminium (d) Sodium
Problem 17
The purest form of coal is: (a) Anthracite (b) Peat (c) Bituminous coal (d) Lignite
Problem 17
What is the molecular formula of borazole? (a) \(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{3}\) (b) \(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\) (c) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (d) \(\mathrm{B}_{6} \mathrm{~N}_{6} \mathrm{H}_{6}\)
Problem 19
Which of the following sets of elements does not belong to transitional element set? (a) \(\mathrm{Cu}, \mathrm{Ag}, \mathrm{Au}\) (b) \(\mathrm{Tl}, \mathrm{Zr}\), Hf (c) Ga, In, Tl (d) \(\mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}\)
Problem 19
The silicates which contain discrete tetrahedral units are: (a) Ortho silicates (b) Sheet silicates (c) Three dimensional silicates (d) Pyrosilicate
Problem 20
Which of the following is used in the preparation of ammonal? (a) \(\mathrm{NaOH}+\mathrm{CaO}\) (b) Al powder (c) \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{CaCN}_{2}+\mathrm{C}\) (graphite)
Problem 21
In the ground state of carbon atom has unpaired electrons: (a) 4 (b) 3 (c) 2 (d) \(\mathrm{No}\)
Problem 21
Among the halides of the elements of group-13 the one which is most acidic is (a) \(\mathrm{AlCl}_{3}\) (b) \(\mathrm{BBr}_{3}\) (c) \(\mathrm{BF}_{3}\) (d) \(\mathrm{BCl}_{3}\)
Problem 22
Which one of the following boron compounds is optically active? (a) Boron anhydride (b) Sodium tetraborate (c) Borosalicylic acid (d) Boron trifluoride
