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ICSE Class 10 Chemistry Question 10 of 22

Solved 2024 Question Paper ICSE Class 10 Chemistry — Question 3

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3
Question

Question 3(iii)

Mohan has three solutions P, Q and R having a pH of 13, 5 and 2 respectively. Which of the above solutions P, Q or R:

(a) will react with Magnesium to liberate hydrogen gas?

(b) will liberate ammonia gas when it reacts with ammonium chloride?

(c) will contain molecules as well as ions?

Answer

(a) Magnesium reacts with acids to liberate hydrogen gas. Therefore, Solutions Q (pH 5) and R (pH 2) will react with magnesium to liberate hydrogen gas.

(b) Ammonium chloride reacts with strong bases to release ammonia gas. A solution with a high pH (basic nature) is required for this reaction to take place. Solution P, with a pH of 13, is strongly basic and will liberate ammonia gas when it reacts with ammonium chloride.

(c) Solution Q (pH 5) will contain both molecules (of the weak acid) and ions (hydrogen ions), as it is a moderately acidic solution where some acid will be in molecular form and some in ionic form.