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Question

Ni is metal but dissolved in CO gas due to formation of A. A decomposes into metal.
(a)What is A ?
(b) A is formed at what temperature
(c) A decomposes into metal at what temperature

A
(a) Ni(CO)4; (b)280C (c) 2300C
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B
(a) Ni(CO)4; (b)480C (c) 3300C
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C
(a) Ni(CO)2; (b)140C (c) 2300C
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D
(a) Ni(CO)2; (b)560C (c) 1250C
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Solution

The correct option is A (a) Ni(CO)4; (b)280C (c) 2300C
Ni combines with CO to form Ni(CO)4. Hence, the compound A is Ni(CO)4.
It is formed at 28oC.
It decomposes at 230oC.
Ni+4CONi(CO)4

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