What colour does methyl orange indicator turn when added to a base or alkali (such as sodium hydroxide)?

Important Questions on Acids, Bases and Salts

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 7

What colour does litmus indicator turn when added to a base or alkali (such as sodium hydroxide)?

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 7

What colour does red cabbage extract turn when added to a base or alkali (such as sodium hydroxide)?

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 8

When a solution is added to a cloth strip treated with onion extract, the smell of onion cannot be detected. Is the given solution acidic or basic?

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 9

When a solution is added to vanilla extract, then the characteristic smell of vanilla can still be detected. Is the given solution acidic or basic?

EASY

10th CBSE

IMPORTANT

New Millenium Science - Chemistry Class X>Chapter 2 - Acids, Bases and Salts>PRACTICE QUESTIONS SET>Q 10

When dry

HCl

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

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.