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

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 (B) H+ ions react with sodium chromate to give sodium ions which turn solution orange (C) Cr3+ ions are liberated in the solution which turn the solution orange (D) sodium hydroxide is formed during the reaction which imparts orange colour to the solution

Tardigrade Admin · Accepted Answer

The reaction between Sodium Chromate and Sulphuric acid is given as:

2 N a_{2} C r O_{4} + H_{2} S O_{4} \to N a_{2} C r_{2} O_{7} + H_{2} O + N a_{2} S O_{4}

C r O_{4}^{2 -}

(chromate ion) is yellow in colour. When it is oxidized by

H^{+} in C r_{2} O_{7}^{2 -}

(dichromate ion), the colour changes to orange.

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

$H^{+}$ ions convert chromate ions to dichromate ions

$H^{+}$ ions react with sodium chromate to give sodium ions which turn solution orange

$C r^{3 +}$ ions are liberated in the solution which turn the solution orange

sodium hydroxide is formed during the reaction which imparts orange colour to the solution

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

H+ ions convert chromate ions to dichromate ions

H+ ions react with sodium chromate to give sodium ions which turn solution orange

Cr3+ ions are liberated in the solution which turn the solution orange

sodium hydroxide is formed during the reaction which imparts orange colour to the solution

The reaction between Sodium Chromate and Sulphuric acid is given as: 2Na2​CrO4​+H2​SO4​→Na2​Cr2​O7​+H2​O+Na2​SO4​ CrO42−​ (chromate ion) is yellow in colour. When it is oxidized by H+inCr2​O72−​ (dichromate ion), the colour changes to orange.

$H^{+}$ ions convert chromate ions to dichromate ions

$H^{+}$ ions react with sodium chromate to give sodium ions which turn solution orange

$C r^{3 +}$ ions are liberated in the solution which turn the solution orange