Chemistry Questions

Q:

Name the Scientist who stated that matter can be converted into energy

A) Boyle B) Lavoisier
C) Avogadro D) Einstein
 
Answer & Explanation Answer: D) Einstein

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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:

SI unit of equivalent conductance

A) ohm/cm B) Siemens m2/equivalent
C) Siemens/equivalent D) mho/cm
 
Answer & Explanation Answer: B) Siemens m2/equivalent

Explanation:

SI_unit_of_equivalent_conductance1556274980.jpg image

 

Equivalent conductance is defined as the conductance of an electrolyte solution containing one gram equivalent of the electrolyte. It is equal to the product of specific conductance (k) of the solution and the volume (V) of the solution that contains one gram equivalent of the electrolyte.

 

 λ = k x V

 

Unit of spceific conductance k is Siemens / m.

 

Volume of the solution V is m3

 

Now, required equivalent conductance unit is Siemens.m2/equivalent .

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Q:

' Yellow cake ' an item of smuggling across border s

A) A crude form of heroin B) A crude form of cocaine
C) Uranium oxide D) Unrefined gold
 
Answer & Explanation Answer: C) Uranium oxide

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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

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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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Q:

The enzyme that converts glucose to ethyl alcohol is 

A) Maltase B) Zymase
C) Diastase D) Invertase
 
Answer & Explanation Answer: B) Zymase

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Q:

Cobalt - 60 is commonly used in radiation therapy because it emits

A) alpha - rays B) beta rays
C) gamma rays D) X - rays
 
Answer & Explanation Answer: C) gamma rays

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