Some Basic Concepts of Chemistry - Result Question 8 — JEE PYQ Chapterwise

8. The volume strength of $1 M H _2 O _2$ is

(Molar mass of $H _2 O _2=34 g mol^{-1}$ )

(2019 Main, 12 Jan II)

(a) 16.8

(b) 22.4

(c) 11.35

5.6

Show Answer

Answer:

Correct Answer: 8. (c)

Solution:

Concentration of $H _2 O _2$ is expressed in terms of volume strength,

i.e. “volume of $O _2$ liberated by $H _2 O _2$ at NTP”. Molarity is connected to volume strength as:

Molarity $(M)=\dfrac{x}{22.4}$ or $x=$ Molarity $\times 22.4$

where, $x=$ concentration

So, for $1 M H_2 O_2$, $x=1 \times 11.2=11.2$

Among the given options, 11.35 is nearest to 11.3.

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