9. Salts of which of the following elements provide colours to fireworks?

Zinc and sulphur

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Potassium and mercury

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Strontium and barium

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Chromium and nickel

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Solution

The correct option is C Strontium and barium
Strontium and barium, both belongs to group 2 of the periodic table. They are also called alkaline earth metals.They have common property of getting tarnished in air due to their high reactivity and imparting characteristic colour to fireworks. Strontium nitrate produces red colour nitrate while barium nitrate produces green flames barium chlorate is used in producing green flames

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