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Question

Yellow coloured aqueous solution of sodium chromate changes to orange when acidified with sulphuric acid because:


A
H+ ions convert chromate ions to dichromate ions
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B
H+ ions react with sodium chromate to give sodium ions which turn solution orange
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C
Cr+ ions are liberated in the solution which turn the solution orange
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D
sodium hydroxide is formed during the reaction which imparts orange colour to the solution
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Solution

The correct option is A $$H^+$$ ions convert chromate ions to dichromate ions
The reaction between Sodium Chromate and  Sulphuric acid is given as:

2$$Na_2CrO_4$$ +  $$H_2SO_4$$ $$\rightarrow$$ $$Na_2Cr_2O_7$$  + $$H_2O$$ +  $$Na_2SO_4$$

$$CrO_4^{2-}$$ (chromate ion) is yellow in colour. When it is oxidized by H$$^+$$ in $$Cr_2O_7^{2-}$$ (dichromate ion), the colour changes to orange.

Chemistry

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