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10th CBSE
IMPORTANT
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A student took two test tubes containing 2 mL of dilute hydrochloric acid and added zinc granules to test tube (A) and solid sodium carbonate to test tube (B) as shown below.

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The correct observation would be

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Important Questions on Practical Chemistry

MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 25
A salt on reacting with dil. H2SO4 gives a reddish brown gas. The salt is 
MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 26
When H2S is passed through a ammonical salt solution X, a white precipitate is obtained. X can be a
MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 27
While preparing soap, a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt?
MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 28
Which of the following does not give borax bead test?
MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 29
Which of the following salts give white ppt. with ammonium hydroxide?
MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 30
Separation of organic compounds by column chromatography is due to
MEDIUM
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 31
Two volatile liquids X and Y differ in their boiling points by 15 °C. The process which can be used to separate them is
EASY
10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 10 - Practical Chemistry>EXERCISE>Q 32
A colourless, odourless, neutral gas which does not turn lime water milky, does not support combustion and is not combustible is