Chemistry Class-11: Chapter –10. The s-Block Elements Part – 2
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Question: 10
Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
(i)
(ii)
(iii)
(iv)
Answer: (i)
Question: 11
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating with . The by-product obtained in this process is
(i)
(ii)
(iii)
(iv)
Answer: (i)
Question: 12
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
(i) Ammoniated electron
(ii) Sodium ion
(iii) Sodium amide
(iv) Ammoniated sodium ion
Answer: (i)
Question:13
By adding gypsum to cement
(i) setting time of cement becomes less.
(ii) setting time of cement increases.
(iii) colour of cement becomes light.
(iv) shining surface is obtained.
Answer: (ii)
Question: 14
Dead burnt plaster is
(i)
(ii)
(iii)
(iv)
Answer: (i)
Question: 15
Suspension of slaked lime in water is known as
(i) Lime water
(ii) Quick lime
(iii) Milk of lime
(iv) Aqueous solution of slaked lime
Answer: (iii)
Question: 16
Which of the following elements does not form hydride by direct heating with dihydrogen?
(i)
(ii)
(iii)
(iv)
Answer: (i)
Question: 17
The formula of soda ash is
(i)
(ii)
(iii)
(iv)
Answer: (iv)