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 Chemistry Questions

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Q:

Which among the following compounds has the strongest hydrogen bond?

A) HI B) HCl
C) HF D) HBr
 
Answer & Explanation Answer: C) HF

Explanation:
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Q:

A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.

A) Six months B) Ten months
C) Twelve Months D) Twenty four months
 
Answer & Explanation Answer: C) Twelve Months

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Q:

Which metal is liquid at room temperature?

A) Bromine B) Chlorine
C) Mercury D) Cesium
 
Answer & Explanation Answer: C) Mercury

Explanation:

Mercury is the only metal that remains in liquid at room temperature.

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Q:

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

A) B2H6 B) Ne
C) C6H14 D) O3
 
Answer & Explanation Answer: D) O3

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Q:

....... is the property of attracting electrons by the halogen atoms in a molecule

A) Electron affinity B) Electro positivity
C) Electro chemistry D) Electro negativity
 
Answer & Explanation Answer: D) Electro negativity

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Q:

If the atomic number of Krypton is 36, then its electronic configuration is:

A) 2,8,18,8 B) 2,8,20,6
C) 2,18,16 D) 2,18,8,8
 
Answer & Explanation Answer: A) 2,8,18,8

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Q:

Which of the following molecules is joined by a double covalent bond?

A) Cl2 B) O2
C) N2 D) He2
 
Answer & Explanation Answer: B) O2

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Q:

Which process is a chemical change?

A) Burning gasoline B) Boiling water
C) Evaporating water D) Melting ice
 
Answer & Explanation Answer: A) Burning gasoline

Explanation:

Burning gasoline is the only process that involving in a chemical change in the given options. A chemical change is a change in the starting substances that are called reactants from the formed new substances that are called products. 

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