Chemistry Questions

Q:

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

A) Argon B) Neon
C) Carbondioxide D) Hydrogen
 
Answer & Explanation Answer: A) Argon

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
 
Answer & Explanation Answer: B) 38.3 J/ mole / K

Explanation:

s=nRlnv2v1 

=2.303 nR logv2v1 = 2.303×2×8.314×log10010 = 38.3 J mol-1k-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
 
Answer & Explanation Answer: C) Cigarette lighters

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
 
Answer & Explanation Answer: B) Option 2

Explanation:

Due to absence of low lying vacant d orbital in B, sp3d2hybridization 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
 
Answer & Explanation Answer: 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
 
Answer & Explanation Answer: 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
 
Answer & Explanation Answer: B) 10

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
 
Answer & Explanation Answer: B) lead

Explanation:
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24 8450