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Options are  calcium oxide and calcium hydroxide.

I have written calcium oxide and i am very confident.

Am I right or not
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Sorry, but your answer is wrong

The correct answer would be: calcium hydroxide

the substance may be lime water,ie, calcium hydroxide. It turns milky when Carbon dioxide is passed through it.

Ca(OH)2 + CO2 = CaCO3 + H2O

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But I think his answer is right. Since sugar +water is sugar solution therefore X+water will be Xsolution. So here a solution of X means X +water so the right answer will be CaO because CaO +water will Ca(OH)2 which is for testing CaO2.

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