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 Chemistry Questions

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Q:

Formation of cation occurs by

A) gain of electron B) loss of electron
C) gain of proton D) loss of proton
 
Answer & Explanation Answer: B) loss of electron

Explanation:
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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:

Which of the following is NOT a compound?

 

A) Ammonia B) Milk
C) Sodiumchloride D) Chalk
 
Answer & Explanation Answer: B) Milk

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Q:

____ are atoms/molecules/ions containing the same number of electrons.

 

A) Isotones B) Isotopes
C) Isoelectronic D) Valence Isoelectronic  
 
Answer & Explanation Answer: C) Isoelectronic

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Q:

Choose the pure substance from the list below.

 

A) Sugar B) Lemonade
C) Air D) Sea water
 
Answer & Explanation Answer: A) Sugar

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Q:

The activation energy for the reverse reaction is represented by

 

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

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Q:

A particle which is similar to electron is

A) positron B) beta particle
C) photon D) mason
 
Answer & Explanation Answer: B) beta particle

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10 6108
Q:

Which of the following processes is used to remove reducible oxides from the metal?

A) liquation B) cupellation
C) poling D) electro refining
 
Answer & Explanation Answer: C) poling

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