Metals, Non-Metals and Noble Gases

Q: Carbonates and bicarbonates reacts with acids to release:

(a) :  CO
(b) :  CO2
(c) :  NO
(d) :  NO2
(e) :  None of the Above
Answer:  CO2
Explanation:  CaCO3 CaO+CO2

Q: Li₂O + H₂O → 2LiOH(aq) the reaction is:

(a) :  redox
(b) :  oxidation and reduction
(c) :  acid-base
(d) :  decomposition
(e) :  None of the Above
Answer:  acid-base
Explanation:  Litium oxide behaves as base and water as oxide

Q: Which of the following halides is not likely to be present in sea water?

(a) :  KBr
(b) :  NaBr
(c) :  CaBr2
(d) :  AgBr
(e) :  None of the Above
Answer:  AgBr
Explanation:  All other halides are present in seawater except silver bromide (AgBr).

Q: KOH is called:

(a) :  caustic potash
(b) :  Washing soda
(c) :  Soda ash
(d) :  Baking soda
(e) :  None of the Above
Answer:  caustic potash
Explanation:  

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