Problem 28
Which of the following is an electron deficient compound? (a) \(\mathrm{NaCl}\) (b) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (c) \(\mathrm{KCl}\) (d) \(\mathrm{NaH}\)
Problem 28
The substance used as a smoke screen in warfare is: (a) \(\mathrm{PH}_{3}\) (b) Acetylene (c) \(\mathrm{SiCl}_{4}\) (d) \(\mathrm{PCl}_{4}\)
Problem 29
For prevention of rusting of iron, which is used in paints? (a) \(\mathrm{PbO}\) b) \(\mathrm{PbO}_{2}\) (c) \(\mathrm{Pb}_{3} \mathrm{O}_{4}\) (d) \(\mathrm{PbSO}_{4}\)
Problem 29
What is the formula of diaspore? (a) \(\mathrm{AlPO}_{4}\) (b) \(\mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{Al}_{2} \mathrm{O}_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
Problem 30
\(\mathrm{BCl}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{X}\) The products formed in above reaction are (a) \(\mathrm{B}_{2} \mathrm{H}_{6}+\mathrm{HCl}\) (b) \(\mathrm{B}_{2} \mathrm{O}_{3}+\mathrm{HOCl}\) (c) \(\mathrm{H}_{3} \mathrm{BO}_{3}+\mathrm{HCl}\) (d) No reaction
Problem 30
Amorphous form of silica is: (a) Cristobalite (b) Tridymite (c) Asbestos (d) Fumed silica
Problem 31
What is the \(\mathrm{C}-\mathrm{C}\) bond length (in angstroms) in diamond? (a) \(5.2\) (b) \(2.0\) (c) \(1.54\) (d) \(3.35\)
Problem 31
On strong heating, boric acid yields (a) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{B}\) (c) \(\mathrm{BO}_{2}\) (d) \(\mathrm{B}_{2} \mathrm{O}_{3}\)
Problem 32
Which of the following oxides is amphoteric in character? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{SiO}_{2}\) (c) \(\mathrm{SnO}_{2}\) (d) \(\mathrm{CaO}\)
Problem 33
Orthoboric acid \(\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)\) and metaboric acid \(\left(\mathrm{HBO}_{2}\right)\) differ in respect of (a) Structure (b) Basicity (c) Melting point (d) All of these
