Q5) 5 A salt is produced in each of the following reactions.P magnesium + dilute hydrochloric acidQ zinc oxide + dilute sulfuric acidR sodium hydroxide + dilute hydrochloric acidS copper carbonate + dilute sulfuric acidWhich statements about the products of the reactions are correct?(i) A flammable gas is produced in reaction P.(ii) Water is formed in all reactions.(iii) All the salts formed are soluble in water.A i, ii and iii B i and ii only C i and iii only D ii and iii only
Question
Q5) 5 A salt is produced in each of the following reactions.P magnesium + dilute hydrochloric acidQ zinc oxide + dilute sulfuric acidR sodium hydroxide + dilute hydrochloric acidS copper carbonate + dilute sulfuric acidWhich statements about the products of the reactions are correct?(i) A flammable gas is produced in reaction P.(ii) Water is formed in all reactions.(iii) All the salts formed are soluble in water.A i, ii and iii B i and ii only C i and iii only D ii and iii only
Solution
The correct answer is D ii and iii only.
Here's why:
(i) A flammable gas is produced in reaction P. This statement is correct. When magnesium reacts with dilute hydrochloric acid, it produces magnesium chloride (a salt) and hydrogen gas. Hydrogen gas is flammable.
(ii) Water is formed in all reactions. This statement is also correct. All of these reactions are examples of acid-base reactions, which typically result in the formation of a salt and water.
(iii) All the salts formed are soluble in water. This statement is correct as well. The salts formed in these reactions (magnesium chloride, zinc sulfate, sodium chloride, and copper sulfate) are all soluble in water.
So, statements ii and iii are correct, but statement i is not correct for all reactions, only for reaction P. Therefore, the correct answer is D ii and iii only.
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