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Q:

A/an ___ flame is produced when the oxygen supply is sufficient.

 

A) red B) orange
C) blue D) green
 
Answer & Explanation Answer: C) blue

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Q:

Which category of Hydrogen releases water vapour and a by product when burnt?

 

A) Green Hydrogen B) Blue Hydrogen
C) Red Hydrogen D) Black Hydrogen
 
Answer & Explanation Answer: A) Green Hydrogen

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Q:

What is the purpose of adding Gypsum to the cement?

 

A) For lubrication B) To slow down its rate of setting
C) To increase its rate of setting D) To make it strong
 
Answer & Explanation Answer: B) To slow down its rate of setting

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Q:

Fill in the blank with the most appropriate option.

 


An element attains stability when it achieves ________ state.

 

A) an only-duplet B) an only-octet
C) a duplet or octet D) a heptate
 
Answer & Explanation Answer: C) a duplet or octet

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Q:

Hydrogen bomb is based on the principle of  

A) nuclear fission B) nuclear fusion
C) natural radioactivity D) artificial radioactivity
 
Answer & Explanation Answer: B) nuclear fusion

Explanation:

Hydrogen Bomb is based on the principle of Nuclear Fusion.

Hydrogen_bomb_is_based_on_the_principle_of1552385714.jpg image

 

  • Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.

 

  • The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
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Q:

Match List -I with List -II and select the correct answer using the code given below the Lists :

            List -I                               List-II

(Compound/Molecule)         (Shape of Molecule)

A. CH3F                            1. Trigonal planar

B. HCHO                           2. Tetrahedral

C. HCN                             3. Trigonal pyramidal

D. NH3                             4. Linear

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

Explanation:

HCHO: The carbon and and the oxygen are bonded through a double bond which counts as "one electron pair". Hence the molecule has three electron pairs and is trigonal planar.

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Q:

The properties of several unknown solids were measured. Choose the correct option.

 

 

 

A) A, C B) A, C, D
C) B, D D) A, B, C, D
 
Answer & Explanation Answer: D) A, B, C, D

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Q:

Which one of the following statements is not correct?

 

A) Fischer projection represents the molecule in an eclipsed conformation B) Newman projection can be represented in eclipsed, staggered and skew conformations
C) Fischer projection of the molecule is its most stable conformation D) In Sawhorse projections, the lines are inclined at an angle of 120 deg to each other.
 
Answer & Explanation Answer: C) Fischer projection of the molecule is its most stable conformation

Explanation:

Fischer projections were originally proposed for the depiction of carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.A Fischer projection always uses an eclipsed conformation. A Newman diagram can represent either an eclipsed conformation or a staggered conformation or a skew conformation.

 

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