Examine the experimental setup and answer any four questions.
A. The reaction between metal and _______ is shown in the above experimental set-up shows
(i) Acid
(ii) Metal carbonate
(iii) Metal hydrogen carbonate
(iv) Metal oxide
B. Name the gas liberated during the process.
(i) Hydrogen gas
(ii) Carbon dioxide gas
(iii) Nitrogen gas
(iv) Nitrogen sulphide gas
C. Which of the following is the correct balanced equation for the above reaction?
(i) $Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$
(ii) $2 Z n + 2 H_{2} S O_{4} \to 2 Z n S O_{4} + 2 H_{2}$
(iii) $Z n + 2 H_{2} S O_{4} \to 2 Z n S O_{4} + H_{2}$
(iv) $2 Z n + H_{2} S O_{4} \to 2 Z n S O_{4} + H_{2}$
D. What will happen if dil. sulphuric acid is replaced with NaOH and the test tube is heated.
(i) It will produce sodium zincate (salt) and hydrogen gas.
(ii) It will produce sodium sulphate and hydrogen gas.
(iii) It will produce sodium zincate (salt) and carbon dioxide gas.
(iv) It will produce sodium sulphate and carbon dioxide gas.
E. Which of the following test will correctly identify the gas evolved?
(i) Bring a glowing splint near the test tube; it will reignite.
(ii) Bring moist litmus paper placed in a test tube of this gas; it turns red.
(iii) Bring a burning splint near the opening of a test tube containing this gas; a popping sound occurs.
(iv) Using universal litmus solution

Question

Examine the experimental setup and answer any four questions.
A. The reaction between metal and _______ is shown in the above experimental set-up shows
(i) Acid
(ii) Metal carbonate
(iii) Metal hydrogen carbonate
(iv) Metal oxide
B. Name the gas liberated during the process.
(i) Hydrogen gas
(ii) Carbon dioxide gas
(iii) Nitrogen gas
(iv) Nitrogen sulphide gas
C. Which of the following is the correct balanced equation for the above reaction?
(i) $Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$
(ii) $2 Z n + 2 H_{2} S O_{4} \to 2 Z n S O_{4} + 2 H_{2}$
(iii) $Z n + 2 H_{2} S O_{4} \to 2 Z n S O_{4} + H_{2}$
(iv) $2 Z n + H_{2} S O_{4} \to 2 Z n S O_{4} + H_{2}$
D. What will happen if dil. sulphuric acid is replaced with NaOH and the test tube is heated.
(i) It will produce sodium zincate (salt) and hydrogen gas.
(ii) It will produce sodium sulphate and hydrogen gas.
(iii) It will produce sodium zincate (salt) and carbon dioxide gas.
(iv) It will produce sodium sulphate and carbon dioxide gas.
E. Which of the following test will correctly identify the gas evolved?
(i) Bring a glowing splint near the test tube; it will reignite.
(ii) Bring moist litmus paper placed in a test tube of this gas; it turns red.
(iii) Bring a burning splint near the opening of a test tube containing this gas; a popping sound occurs.
(iv) Using universal litmus solution

Infinity Learn · Accepted Answer

A.

The above experimental setup shows the reaction between metal and acid. Hence option (i) Acid is correct.

B.

Hydrogen gas is liberated during the process as hydrogen gas is liberated when an acid reacts with a metal.

C.

$Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$

Hence option (i) is correct.

D.

If we used NaOH in place of dilute sulphuric acid and the tube is heated, the reaction can be as follows.

$2 N a O H (a q) + Z n (s) \to N a_{2} Z n O_{2} (a q) + H_{2} (g)$

In the above reaction, there is the formation of hydrogen. However, such reactions are not possible with all metals.
Hence option (i) It will produce sodium zincate (salt) and hydrogen gas, is correct.

E.

Bring a burning splint near the opening of a test tube containing this gas, and a popping sound occurs. Hydrogen gas can immediately catch fire, followed by the “pop sound”. Therefore by using this property, we can detect whether the hydrogen gas is getting evolved in a reaction or not. Hence option (iii) Bring a burning splint near the opening of a test tube containing this gas; a popping sound occurs is correct.

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