Question

SECTION C(CCT)
A substance X, which is an oxide of an element, is used
intensively in the cement industry, This element is present in
bones also. On treatment with water, it forms a solution which
turns red litmus blue.
Substance X

49. The substance X is an oxide of:
(A)copper (b) carbon
© calcium (d) none of the above
50. What is the common name of substance _X
Slaking of lime (b) quick lime
(c) both (a) and (b) (d) none of the above
51. Which of the following is a correct observation when water is added to substance _X
(a) vigorous bubbling and a hissing sound
(b) slow bubbling with no sound
(c) vigorous bubbling with evolution of heat and a hissing sound
(d) only hissing sound
52Reaction of substance X with water is
(a)Decomposition reaction
(b)Combination reaction
(c)Displacement reaction
(d)Double displacement reaction​

Answer 1

Answer:

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Answer 2

Answer:

Explanation:

Use language that's easy-to-understand. If there's a piece of vocabulary that you feel needs clarifying, define it!