Paper on reaction with concentrated-turns black and has a burnt look-boric acidlactic acidconc- sulphuric aciddil- hydrochloric acid

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Standard VII

Chemistry

Acids

Paper on reac...

Question

Paper on reaction with concentrated ___ turns black and has a burnt look.

conc. sulphuric acid

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lactic acid

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boric acid

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dil. hydrochloric acid

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Solution

The correct option is A conc. sulphuric acid
Concentrated sulphuric acid is a very good dehydrating agent. When it comes in contact with the paper, it reacts with the paper and removes the water content from the paper. As a result, color of the paper changes to black and it appears to be burnt.

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Similar questions

(c) Write balanced equations for the following reactions:
(i) dissolving sulphur trioxide in water.
(ii) Aluminium powder is warmed with hot and concentrated caustic soda solution.
(iii) Concentrated nitric acid is added to copper turnings kept in a beaker.
(iv) Red lead (trilead tetroxide) is warmed with concentrated hydrochloric acid.

Write word equations and then balanced equations for the reaction taking

place when −

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(b) dilute hydrochloric acid reacts with magnesium ribbon.

(d) dilute hydrochloric acid reacts with iron filings.

Q. Paper on reaction with concentrated ___ turns black and has a burnt look.

Q. Give a chemical test to distinguish between :
(a) dilute sulphuric acid and dilute hydrochloric acid.
(b) dilute sulphuric acid and concentrated sulphuric acid.
[4 MARKS]

Q. A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid & copper turnings?

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Paper on reaction with concentrated ___ turns black and has a burnt look.

The correct option is A conc. sulphuric acidConcentrated sulphuric acid is a very good dehydrating agent. When it comes in contact with the paper, it reacts with the paper and removes the water content from the paper. As a result, color of the paper changes to black and it appears to be burnt.

The correct option is A conc. sulphuric acid
Concentrated sulphuric acid is a very good dehydrating agent. When it comes in contact with the paper, it reacts with the paper and removes the water content from the paper. As a result, color of the paper changes to black and it appears to be burnt.