Chemistry Questions

Q:

The number of neutrons in dipositive Zinc ion is

A) 34 B) 36
C) 38 D) 40
 
Answer & Explanation Answer: D) 40

Explanation:
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Q:

Dry distillation of calcium formate gives

A) HCOOH B) CH3COOH
C) HCHO D) CH3CHO
 
Answer & Explanation Answer: C) HCHO

Explanation:

Dry distillation of calcium acetate and calcium formate leads to the formation of aldehydes and ketones.

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Q:

What is the systematic name of Mg(NO3)2?

A) Manganese nitrite B) Magnesium nitrite
C) Magnesium nitrate D) Manganese nitrate
 
Answer & Explanation Answer: C) Magnesium nitrate

Explanation:

Mg(NO3)2 is Magnesium nitrate.

 

In the case of Mg(NO3)2, the metal in the compound is magnesium (Mg), and the non-metal here is called the nitrate ion (NO3). This makes the name of the compound simply magnesium nitrate.

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Q:

The activity of rradioisotope change with

A) temperature B) pressure
C) chemical environment D) None of these
 
Answer & Explanation Answer: D) None of these

Explanation:
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Q:

Leakage of which of the following gases caused the Bhopal gas tragedy ?

A) Carbon monoxide B) Methyl isocyanate
C) Nitrous oxide D) Hydrogen sulphide
 
Answer & Explanation Answer: B) Methyl isocyanate

Explanation:
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Q:

Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

A) Chloroform B) 2, 2, 2-Trichloroethanol
C) Trichloromethanol D) 2, 2, 2-Trichloropropanol
 
Answer & Explanation Answer: B) 2, 2, 2-Trichloroethanol

Explanation:

Cl|Cl-C-CHO|ClCannizzaro's ReactionNaOH Cl|Cl-C-COONa|Cl+ Cl|Cl-C-CH2 |21Cl-OH

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Q:

Oxidation Number of 'S' in H2SO4?

A) +6 B) +2
C) -6 D) -2
 
Answer & Explanation Answer: A) +6

Explanation:

In H2SO4,

Hydrogen has a charge of +2, with each hydrogen has +1.

Oxygen has  a charge of -8, with each oxugen has -2.

Total charge = (2 - 8) = -6

Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.

 

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Q:

Which compound matches the IR Spectrum?

Which_compound_matches_the_IR_Spectrum11562648897.png image

A) 3 – Hexanol B) Trans – 4 – Octene
C) 1, 5 – Hexadiene D) None of the above
 
Answer & Explanation Answer: C) 1, 5 – Hexadiene

Explanation:

Infrared spectroscopy involves the interaction of infrared radiation with matter. It is used by chemists to determine functional groups in molecules. IR Spectroscopy measures the vibrations of atoms, and based on this it is possible to determine the functional groups.

Here in the given spectrum, there is no alcohol stretch present in the spectrum. There is no vinyl bending present in the spectrum.
 

Hence, both options B and C are compounds that are not matching with IR spectrum. 1, 5 – Hexadiene is the compound matches the IR Spectrum.

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