Choose the best: Types of chemical reactions — task. Science CBSE, Class 10.

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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 \Ca(NO_3)_2\) is heated, it gives \(CaO\), \(NO_2\)(g) and \(O_2\)(g). The correct number of moles of \(Ca(NO_3)_2\), \(CaO\), \(NO_2\)(g) and \(O_2\)(g) are present in the reaction are respectively

\(1\), \(3\), \(4\), \(1\)
\(2\), \(1\), \(3\), \(2\)
\(2\), \(2\), \(4\), \(1\)
\(2\), \(1\), \(1\), \(2\)

2. Which one of the following involve a chemical reaction?

Evaporation of water
Keeping petrol in a china dish in open
Storing on nitrogen gas under pressure
Heating magnesium wire in the presence of air at high temperature

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33. Choose the best: Types of chemical reactions

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