KVPY SA Exam 05-Nov-2017 Question Paper

Question : 40 of 80

Marks: +1, -0

X g of Ca [atomic mass = 40] dissolves completely in concentrated HCl solution to produce 5.04 L of H

_2

gas at STP. The value of X is closest to

Solution:

Ca + 2HCl →CaCl_2 + H_2 (g)

x/40\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;5.04/22.4

⇒

x/40=5.04/22.4⇒x=9

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