A salt is produced in each of the following reactions.
P magnesium + dilute hydrochloric acid
Q zinc oxide + dilute sulfuric acid
R sodium hydroxide + dilute hydrochloric acid
S copper carbonate + dilute sulfuric acid
Which statements about the products of the reactions are correct?
1 A flammable gas is produced in reaction P.
2 Water is formed in all reactions.
3 All the salts formed are soluble in water.
1 )
1, 2 and 3
2 )
1 and 2 only
1 and 3 only
4 )
2 and 3 only
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