Problem 57
Which of the following aluminium salt is used to stop bleeding (a) Aluminium chloride (b) Aluminium fluoride (c) Aluminium sulphate (d) Potash alum
Problem 58
Silicon is an important constituent of: (a) Amalgams (b) Chlorophyll (c) Haemoglobin (d) Rocks
Problem 58
Maximum bond angle is present in case of (a) \(\mathrm{BCl}_{3}\) (b) \(\overrightarrow{\mathrm{BF}}_{3}\) (c) \(\mathrm{BBr}_{3}\) (d) same in all
Problem 59
Which of the following ion does not exist in octahedral aqua ions? (a) \(\mathrm{Al}\) (b) Ga (c) \(\mathrm{Tl}\) (d) B
Problem 60
Which of the following does not exist in free state? (a) \(\mathrm{BCl}_{3}\) (b) \(\mathrm{BH}_{3}\) (c) \(\mathrm{BF}_{3}\) (d) \(\mathrm{BBr}_{3}\)
Problem 60
What is the number of free electrons present on each carbon atom in graphite? (a) Zero (b) 1 (c) 2 (d) 3
Problem 61
A dry ice piece is composed of: (a) Solid \(\mathrm{C}_{6} \mathrm{H}_{6}\) (b) Solid \(\mathrm{SO}_{2}\) (c) Solid \(\mathrm{CO}_{2}\) (d) Solid He
Problem 61
Which of the following reactions does not liberate gaseous product? (a) \(\mathrm{AlCl}_{3}+\mathrm{NaOH} \rightarrow\) (b) \(\mathrm{NaOH}+\mathrm{P}(\) white \()+\mathrm{H}_{2} \mathrm{O} \rightarrow\) (c) \(\mathrm{Al}+\mathrm{NaOH} \stackrel{\Delta}{\longrightarrow}\) (d) \(\mathrm{Zn}+\mathrm{NaOH} \stackrel{\Delta}{\longrightarrow}\)
Problem 62
Which one of the following is used as an acid flux in metallurgy? (a) \(\mathrm{SiO}_{2}\) (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (d) \(\mathrm{CaO}\)
Problem 62
Inorganic graphite is (a) \(\mathrm{B}_{3} \mathrm{~N}_{3}\) (b) \(\mathrm{SiC}\) (c) \(\mathrm{P}_{4} \mathrm{~S}_{3}\) (d) \(\mathrm{Fe}(\mathrm{CO})_{5}\)
