1 This question is about gases.(a) The following substances are gases at room temperature.letter A B C D E F G Hsubstance SO 2 Ar CO Cl 2 NH 3 CO2 CH 4 C 3 H 8Identify, by letter:(i) a gas which combines with water to form acid rain ...................................................... [1](ii) two gases which exist as diatomic molecules ........................................................
Question
1 This question is about gases.(a) The following substances are gases at room temperature.letter A B C D E F G Hsubstance SO 2 Ar CO Cl 2 NH 3 CO2 CH 4 C 3 H 8Identify, by letter:(i) a gas which combines with water to form acid rain ...................................................... 1 two gases which exist as diatomic molecules ........................................................
Solution
(i) The gas which combines with water to form acid rain is SO2 (letter A). This is because when sulfur dioxide (SO2) mixes with rainwater, it forms sulfurous acid, which is a component of acid rain.
(ii) Two gases which exist as diatomic molecules are Cl2 (letter D) and CO (letter C). Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements. In this case, Chlorine (Cl2) and Carbon Monoxide (CO) are both composed of two atoms.
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