NCERT Exemplar: MCQs V — 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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1. If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Neutralise the acid with a strong alkali.
Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.
After washing with plenty of water, apply solution of sodium hydroxide on the hand.
Wash the hand with saline solution.

2. Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
(i) It turns lime water milky
(ii) It extinguishes a burning splinter
(iii) It dissolves in a solution of sodium hydroxide
(iv) It has a pungent odour

(ii), (iii) and (iv)
(i) and (ii)
(i) and (iv)
(i), (ii) and (iii)

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26. NCERT Exemplar: MCQs V

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