Chemistry - Study Mode
[#601] Air is said to be saturated when :
Correct Answer
(A) It contains maximum content of water vapour
Explanation
Solution: Air is said to be saturated when the amount of water vapour in the air is the maximum possible at an existing temperature and pressure. Air is said to be saturated at 100 percent relative humidity when it contains the maximum amount of moisture possible at that specific temperature.
[#602] For extinguishing fire, we use
Correct Answer
(C) Carbon Dioxide
Explanation
Solution: For extinguishing fire, we use Carbon Dioxide.
[#603] Dry powder fire extinguishers contain
Correct Answer
(D) Sand and sodium bicarbonate
Explanation
Solution: Dry powder fire extinguishers contain Sand and sodium bicarbonate.
[#604] Dry ice is the solid form of :
Correct Answer
(B) Carbon dioxide
Explanation
Solution: Dry ice, carbon dioxide in its solid form, a dense, snow like substance that sublimes (passes directly into the vapour without melting) at −78.5 °C (−109.3 °F), used as a refrigerant, especially during shipping of perishable products such as meats or ice cream.
[#605] Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
Correct Answer
(A) Copper at cathode and oxygen at anode
Explanation
Solution: Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives copper at cathode and oxygen at anode.