question_answer

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. ‘A’ imparts a deep golden yellow colour to a smokeless flame of bunsen burner A, B, C and D respectively are:                        [AIPMT 1998]

A) \[Na,\,{{H}_{2}},\,NaOH,\,Zn\]

B) \[K,\,{{H}_{2}},\,KOH,\,Al\]      

C) \[Ca{{H}_{2}},\,Ca{{(OH)}_{2}},\,Sn\]

D) \[Ca{{C}_{2}},\,{{C}_{2}}{{H}_{2}},\,Ca{{(OH)}_{2}},\,Fe\]

Correct Answer: A

Solution :

[a] Only Na gives golden colour to bunsen flame. So, A is Na.

Na, produces golden yellow colour with smokeless flame of bunsen burner.