गिव द फॉर्मूला एंड वैलेंसी ऑफ़ एलुमिनेट
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Formula of aluminate is AlO₃ and valancey =-1 formula of chromate is CrO₄ ⁻² and valancey =2 formula of aluminium is Al and Valancey=3
formula of cupric isCu(ll) and Valancey=2.
hope it helps you
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