Question

(a)If both (A) and (R) are true and the (R) is the correct explanation of the (A).

(b) If both (A) and (R) are true but the (R) is not the correct explanation of the (A).

(c) If (A) is true but (R) is false.

(d) If(A) is false but (R) is true.


25. Assertion:-Refractive index is a quality which does not have any unit.

Reason:- Refractive index is the ratio of two similar quantities.


26.Assertion:-Blood pressure is arterial Blood pressure.

Reason:- It is measured by sphygmomanometer.


27.Assertion:-Fe2O3 + 2Al = Al2O3 + 2Fe

The above chemical equation is an example of displacement reaction.

Reason:- Aluminium being more reactive than iron displace iron from its oxide.



28. Assertion:-Electrical wires are be made up of copper.

Reason:- Copper is a bad conductor of electricity.


29. Assertion:-Phenolphthalein gives pink colour in basic solution.

Reason:- Phenolphthalein is a natural indicator.

Answer 1

EXPLANATION

(a) Both (A) and (R) are true and the (R) is the correct explanation of the (A).

because reason is always helpful and

assertion is such a sentence

FINAL ANSWER

(a) Both (A) and (R) are true and the (R) is the correct explanation of the (A).

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Answer 2

Thanks for your question...

Your required answer :

1. (b) If both (A) and (R) are true but the (R) is not the correct explanation of the (A).
2. Both A and R are true
3. (c) If (A) is true but (R) is false.
4. (a)If both (A) and (R) are true and the (R) is the correct explanation of the (A).
5. c) If (A) is true but (R) is false.
6. (a)If both (A) and (R) are true and the (R) is the correct explanation of the (A).