Number of incorrect statements among following? (a) Largest single use of dihydrogen is synthesis of NH 3 (b) Clark's method is used for removal of permanent hardness (c) Hydrogen economy is re

Question

Number of incorrect statements among following?

(a) Largest single use of dihydrogen is synthesis of $NH_{3}$

(b) Clark's method is used for removal of permanent hardness

(c) Hydrogen economy is related to transportation and storage of energy in the form of solid or liquid $H_{2}$

(d) Group 7 elements form metallic hydrides

(e) $D_{2} O$ have lesser B.P. than $H_{2} O$

(f) LiH is not saline hydride

(g) PAN stands for peroxyacetyl nitrate

TestHub · Accepted Answer

Let's analyze each statement:

(a) Largest single use of dihydrogen is synthesis of $NH_{3}$ . (CORRECT)

(b) Clark's method is used for removal of permanent hardness. (INCORRECT - Clark's method removes temporary hardness)

(c) Hydrogen economy is related to transportation and storage of energy in the form of solid or liquid $H_{2}$ . (CORRECT)

(d) Group 7 elements form metallic hydrides. (INCORRECT - Group 7 elements form covalent hydrides, metallic hydrides are formed by d- and f-block elements)

(e) $D_{2} O$ have lesser B.P. than $H_{2} O$ . (INCORRECT - $D_{2} O$ has a higher boiling point due to stronger hydrogen bonding)

(f) LiH is not saline hydride. (INCORRECT - LiH is a saline (ionic) hydride)

(g) PAN stands for peroxyacetyl nitrate. (CORRECT)

Number of incorrect statements = 4.

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