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K_{2} C r_{2} O_{7}

ও গাঢ়

H_{2} S O_{4}

K_{2} C r_{2} O_{7}

গাঢ় ও হালকা

H_{2} S O_{4}

K_{2} C r_{2} O_{7}

ও

H_{2} S O_{4}

K_{2} C r_{2} O_{7}

গাঢ় ও হালকা

H_{2} S O_{4}

ANS : 1

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