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Select the correct option for the given question:
Answer variants:
Curd contains lactic acid.
Slaked lime - gas \(Ca(OH)_2\), Lime water - solid \(Ca(OH)_5\)
Red litmus will turn blue colour in ammonium hydroxide.
1. What is the colour of litmus in a solution of ammonium hydroxide?
2. Curd is not kept in copper and brass utensils, why?
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