41) Which mineral is used making plaster and paper? Answer: Gypsum. 42) M is the molecular weight of KMnO4. The equivalent weight of KMnO4when it is
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Question

41) Which mineral is used making plaster and paper?Answer: Gypsum. 

42) M is the molecular weight of KMnO4. The equivalent weight of KMnO4 when it is converted into K2MnO4 is

(a) M (b) M/3 (c) M/5 (d) M/7

Answer: A.

 

43) Which is the metal as strong as steel but half as much in weight?

Answer: Titanium.

 

44) Which material is used in display devices, such as digital watches?

Answer: Liquid crystal.

 

45) Which metal is extracted by the Mond process?

Answer: Nickel.

 

46) If 0.50 mole of BaCl2 is mixed with 0.20 mol of Na3 PO4, the maximum number of moles of Ba3 (PO4) 2 that can be formed is

(a) 0.70 (b) 0.50 (c) 0.20 (d) 0.10

Answer: D.

 

47) Which is the most stable compound?

Answer: Sodium hydroxide.

 

48) Which chemical compound may soon be used as a fuel for driving vehicles?

Answer: Ethanol.

 

49) What is the purest form of iron?

Answer: Wrought iron.

 

50) One mole of N2H4 loses ten moles of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation state of hydrogen).

(a) -1 (b) -3 (c) +3 (d) +5

Answer: C.

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