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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acids and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the reaction to the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.

(iv) Krati detected the pH of four unknown solutions A, B, C, and D as follows: 11, 5, 7, and 2 respectively, and noted down her results.

1. C is neutral in nature.

2. On reacting A and D, water is liberated.

3. A and C are basic in nature.

4. B and D react to form hydrogen gas.
1 All are correct  
2 1 and 2 are correct  
3 1 and 4 are correct  
4 1, 2 and 3 are correct  

Ans.

(2)