Problem 22
Mortar is a mixture of: (a) Slaked lime \(+\) silica \(+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{CaCO}_{3}+\) silica \(+\mathrm{H}_{2} \mathrm{O}\) (c) Slaked lime \(+\) plaster of paris \(+\mathrm{H}_{2} \mathrm{O}\) (d) Plaster of paris + silica
Problem 23
The reaction of slaked lime with \(\mathrm{Cl}_{2}\) gas gives: (a) A mixture of \(\mathrm{Ca}(\mathrm{OCl})_{2}, \mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{CaCl}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) (b) Quick lime (c) Baryta water (d) Only \(\mathrm{Ca}(\mathrm{OCl})_{2}\)
Problem 24
Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and: (a) \(\mathrm{P}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{P}_{2} \mathrm{O}_{5}\) (c) \(\mathrm{NaH}_{2} \mathrm{PO}_{2}\) (d) \(\mathrm{Na}_{3} \mathrm{PO}_{3}\)
Problem 25
Metals having \(\mathrm{ns}^{1}\) as the valence electronic configuration: (a) Have a first ionization potential of more than \(10 \mathrm{eV} /\) atom (b) Are highly electropositive (c) Are highly electronegative (d) Act as strong oxidizing reagents
Problem 26
An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of: (a) Weak acid and weak base (b) Weak acid and strong base (c) Strong acid and strong base (d) Strong acid and weak base
Problem 27
In solvay process of manufacture of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\), the by products are: (a) \(\mathrm{CaCl}_{2}, \mathrm{CO}_{2}, \mathrm{NH}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{CO}_{2}\) (c) \(\mathrm{NH}_{4} \mathrm{Cl}, \mathrm{CaO}\) (d) \(\mathrm{CaO}, \mathrm{Na}_{2} \mathrm{CO}_{3}\)
Problem 28
Aqueous solution of Carnalite gives positive test for: (a) Potassium, magnesium and chloride ions (b) Potassium ions only (c) Potassium and chloride ions only (d) Chloride ions only
Problem 29
Which of the following set of raw materials are used in the manufacture of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) by Solvay process? (a) \(\mathrm{CaCl}_{2}, \mathrm{NH}_{3}, \mathrm{CO}_{2}\) (b) \(\mathrm{NaOH}, \mathrm{NH}_{3}, \mathrm{CO}_{2}\) (c) \(\mathrm{NaCl}, \mathrm{NH}_{3}, \mathrm{CO}_{2}\) (d) \(\mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{NH}_{3}, \mathrm{CO}_{2}\)
Problem 31
Which of the following covalent molecules in an exception of octet rule? (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{BeCl}_{2}\) (d) \(\mathrm{H}_{2} \mathrm{O}\)
Problem 33
Which is insoluble in water? (a) \(\mathrm{CaF}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{HgCl}_{2}\) (d) \(\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}\)
