# Chemistry Questions

Q:

What is the third most common gas found in the air we breathe ?

 A) Argon B) Neon C) Carbondioxide D) Hydrogen

Explanation:

The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

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22 10157
Q:

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 $dm3$ at 27°C is to a volume of 100 $dm3$

 A) 42.3 J/ mole / K B) 38.3 J/ mole / K C) 35.8 J/ mole / K D) 32.3 J/ mole / K

Explanation:

$∆s=nRlnv2v1$

= $2.303×2×8.314×log10010$ =  $mol-1$$k-1$

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16 10029
Q:

' Misch metal ' is widely used in manufacture of which of the following

 A) Material of car brake B) Smoke detectors C) Cigarette lighters D) Emergency lights

Explanation:

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25 9835
Q:

Boron cannot form which one of the following anions?

(1) $BO2-$

(2) $BF63-$

(3) $BH4-$

(4) $B(OH)4-$

 A) Option 1 B) Option 2 C) Option 3 D) Option 4

Explanation:

Due to absence of low lying vacant d orbital in B, $sp3d2$hybridization is not possible hence $BF63-$will not formed.

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11 9756
Q:

Which one is not metal

 A) sulpher B) sugar C) nitogen D) all of these

Explanation:

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64 9443
Q:

What is the element present in urea

 A) C,H,O B) C,N,O C) C,N,H D) C,O,N,H

Explanation:

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20 9437
Q:

How many electrons are there in Na+

 A) 1 B) 10 C) 11 D) 12

Explanation:

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26 9317
Q:

Which one of the following elements is the poorest conductor of heat

 A) sodium B) lead C) zinc D) mercury