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 Chemistry Questions

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Q:

Among the given nutrients, milk is a poor source of

A) Calcium B) Protein
C) Vitamin C D) Carbohydrates
 
Answer & Explanation Answer: C) Vitamin C

Explanation:
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Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid D) Potassium dichromatic-sulphuric acid
 
Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

Explanation:
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114 29152
Q:

Place these hydrocarbons in order of decreasing boiling point.

1. Paraffin

2. Octadecane

3. Hexane

4. Neohexane and

5. Ethane

A) Paraffin > Octadecane > Neohexane > Hexane > Ethane B) Paraffin > Octadecane > Hexane > Neohexane > Ethane
C) Hexane > Paraffin > Octadecane > Neohexane > Ethane D) None of the above
 
Answer & Explanation Answer: B) Paraffin > Octadecane > Hexane > Neohexane > Ethane

Explanation:

In hydrocarbon, the boiling point directly varies with the length of carbon chain. On increasing the number of carbon atom, the boiling point of the compound also increases. Paraffin contains highest number of carbon atoms whereas, ethane is comprised of two carbon atoms.

 

The decreasing order of boiling point of mention compounds is written as follows:

Paraffin > Octadecane > Hexane > Neohexane > Ethane

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Q:

Brass gets discoloured in air because of the presence of which of the following gases in air  ?

A) Hydrogen sulphide B) Oxygen
C) Nitrogen D) Carbon dioxide
 
Answer & Explanation Answer: A) Hydrogen sulphide

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Q:

Which of the following reactions are exothermic?

 

1)   C + O2  → CO22)  2Mg + O2  → 2MgO3)  CuSO4 + 5H2O  → CuSO4.5H2O4)  All the above

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: D) 4

Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

 

Generally all the combining reactions are exothermic in nature.

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Q:

What is the IUPAC name for the following compound?

 

H3C-C≡C-H

A) Acetylene B) Methyl acetylene
C) Butanol D) Decanoic Acid
 
Answer & Explanation Answer: B) Methyl acetylene

Explanation:

The IUPAC name of the compound is Methyl Acetylene or Propyne.

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Q:

What is the structure of IF7 ?

A) Triagonal bipyramid B) Pentagonal bipyramid
C) Square pyramid D) tetrahedral
 
Answer & Explanation Answer: B) Pentagonal bipyramid

Explanation:

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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195 27483
Q:

what is the chemical name of the compound 

Cu2CO3

A) copper (ii) carbonate B) copper (iii) carbonate
C) copper (i) carbonate D) copper carbonate
 
Answer & Explanation Answer: C) copper (i) carbonate

Explanation:

The chemical name of the compound 

Cu2CO3 is Copper (i) carbonate and is also called as cuprous carbonate.

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