When dry $HCl$ gas is passed over blue litmus paper strip, it does not turn red. What may be the probable reason?

Important Questions on Acids, Bases and Salts

MEDIUM

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 11

A student was provided with three test-tubes. One test-tube contained distilled water and the other two contained an acidic and a basic solution respectively. The student was provided only blue litmus paper. How can he identify the contents of each test-tube?

HARD

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 12

A piece of white cloth has a yellow stain of curry. When soap is applied on this cloth during washing, the yellow stain turns reddish-brown. On rinsing the cloth with excess of water, the reddish-brown stain again turns yellow.
(a) Name the indicator that may be present in the curry stain.
(b) Explain the changes in colour observed.
(c) Is the soap acidic or basic?

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>ANSWER/HINTS SET>Q 1

Define an acid and a base. Give one example of each.

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>ANSWER/HINTS SET>Q 2

Give the names and formulae of two strong acids and two weak acids.

HARD

10th CBSE