Choose the best: Chemical reactions and equations

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Choose the best answer:

1. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of-

a decomposition reaction
a combination reaction
a double decomposition reaction
a reduction reaction

2. Sam added dilute \(HCl\) to a test tube containing zinc granules and made following observations:

a gas evolved which burnt with a pop sound
the solution remained colourless
the zinc surface became dull and black
the solution becomes blue in colour

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18. Choose the best: Chemical reactions and equations

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