Problem 34
What are the products formed when an aqueous solution of magnesium bicarbonate is boiled? (a) \(\mathrm{Mg}, \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{Mg}(\mathrm{OH})_{2}, \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{MgCO}_{3}, \mathrm{H}_{2} \mathrm{O}, \mathrm{CO}_{2}\) (d) \(\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}, \mathrm{H}_{2} \mathrm{O}\)
Problem 35
Which of the following is calcium superphosphate? (a) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \mathrm{H}_{2} \mathrm{O}+\mathrm{CaSO}_{4}\) (b) \(\mathrm{CaSO}_{4}+\mathrm{CaO}\) (c) \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}+2 \mathrm{CaSO}_{4}\) (d) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \mathrm{H}_{2} \mathrm{O}+2\left(\mathrm{CaSO}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O}\right)\)
Problem 36
What is the molecular formula of plaster of pairs? (a) \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\) (c) \(2 \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)
Problem 37
The metal that dissolves in liquid ammonia, giving a dark blue coloured solution is: (a) Lead (b) Tin (c) Silver (d) Sodium
Problem 38
What is the molecular formula of gypsum? (a) \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\) (d) \(2 \mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)
Problem 39
In the Castner's process of extraction of sodium cathode is: (a) Nickel rod (b) Iron rod (c) Graphite rod (d) Copper rod
Problem 40
Plaster of paris is used: (a) In dentistry and surgery. (b) As a plaster for walls. (c) As a drying agent. (d) In metallurgical process.
Problem 41
Which one is used as an air purifier in spacecraft? (a) Potassium super oxide (b) Anhydrous \(\mathrm{CaCl}_{2}\) (c) Quick lime (d) Slake lime
Problem 42
Which of the following is correct pair? (a) \(\mathrm{NH}_{3}\), linear (b) \(\mathrm{BF}_{3}\), octahedral (c) \(\mathrm{BeCl}_{2}\), liner (d) \(\mathrm{CO}_{2}\), tetrahedral
Problem 43
The active constituent of bleaching powder is: (a) \(\mathrm{Ca}\left(\mathrm{ClO}_{2}\right)_{2}\) (b) \(\mathrm{Ca}(\mathrm{OCl}) \mathrm{Cl}\) (c) \(\mathrm{Ca}(\mathrm{OCl})_{2}\) (d) \(\mathrm{Ca}(\mathrm{OCl}) \mathrm{Cl}\)
