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Class 10
Solutions to CBSE Sample Paper - Science Class 10

In which of the following setups would the bulb glow?

Q 30 - following setups would the bulb glow - Teachoo.jpg

(A) i and ii 

(B) i and iv 

(C) ii, iii and iv 

(D) i, ii and iv

 

Answer - 

Acids and Bases , when dissolved in water, conducts electricity … because it forms ions.

Hydronium Ions-01.jpg

From our options

  1. For (i) - Since HCl is acidic, it forms ions in water. Thus, it conducts electricity.
  2. For (ii) - Alcohol does not form ions in water. Thus, it does not conduct electricity.
  3. For (ii) - Alcohol does not form ions in water. Thus, it does not conduct electricity.
  4. For (iv) - Since Lime Water (Ca(OH) 2 ) is basic, it forms ions in water. Thus, it conducts electricity.

 

Thus, (i) and (iv) are correct

So, the correct answer is (b)

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