Day 225: CBSE Class 10 Science

1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   Strong acid, weak acid, neutral, strong base
2. B.
   Weak acid, neutral, weak base, strong base
3. C.
   Weak acid, neutral, strong base, weak base
4. D.
   Weak acid, neutral, strong base, strong acid

Tap an option to check your answer.

1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false, but Reason (R) is true.

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1. A.
   The polish over the jewellery was removed after wearing for a few months.
2. B.
   The jewellery comes in contact with air, moisture and acids and corrodes.
3. C.
   Dust particles over the jewellery change its colour.
4. D.
   Its colour changes due to rusting.

Tap an option to check your answer.