The vapour density of a gas depend upon the:

total number of electron in the molecules

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total numbers of neutrons in the molecules

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total number of molecules

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molecular mass of gas

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Solution

The correct option is A total number of electron in the molecules
Vapour density of gas
$= \frac{w e i g h t o f \times m o l e c u l e o f g a s}{w e i g h t o f \times m o l e c u l e s o f h y d r o g e n}$
$= \frac{m o l e c u l e s w e i g h t}{2}$
So, vapour density depends upon the molecular mass of gas..

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Q. Complete the following table.

(i)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
9	-	10	-	-	-

(ii)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
16	32	-	-	-	Sulphur

(iii)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
16	32	-	-	-	Sulphur

(iv)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
-	2	-	1	-	-

(v)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
-	1	0	1	1	-

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The vapour density of a gas depend upon the:

The correct option is A total number of electron in the moleculesVapour density of gas=weight of×molecule of gasweight of ×molecules of hydrogen=molecules weight2So, vapour density depends upon the molecular mass of gas..