Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ]

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Question 50 (Case Based MCQ) - Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ] - Solutions to CBSE Sample Paper - Science Class 10

Last updated at August 14, 2026 by

How many grams of Magnesium Sulphate are present in 135g of solid left by evaporation of sea water?  

(A) 6g 

(B) 12g 

(C) 18g 

(D) 24g 

 

Answer - 

 

From our table

Q 49 - compound in the table reacts with acids - Teachoo.jpg

  • In 45 g solid, we have 6g Magnesium Sulphate
  • In 1 g solid, we have 6/45 g Magnesium Sulphate
  • In 135 g solid, we have 6/45 × 135 g = 6 × 3 = 18g  Magnesium Sulphate

 

So, the correct answer is (c)

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