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 Chemistry Questions

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Q:

Which of the following bonds are weakest in nature?

A) Single bond B) Double bond
C) Triple bond D) Hydrogen bond
 
Answer & Explanation Answer: D) Hydrogen bond

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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:

NaHCO3 is chemical formula for ___________.

A) Borax B) Vinegar
C) Lime D) Baking soda
 
Answer & Explanation Answer: D) Baking soda

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Q:

Which one of the following is a physical change?

A) Burning of coal B) Burning of wood
C) Heating of a platinum crucible D) Heating of potassium chlorate
 
Answer & Explanation Answer: C) Heating of a platinum crucible

Explanation:

In Burning of coal, burning of wood and Heating of Potassium Chlorate there will be some sort of chemical change, but Heating of a Platinum crucible is a physical change.

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Q:

The chemical formula of Ammonia is _____ .

A) NH B) NH1
C) NH2 D) NH3
 
Answer & Explanation Answer: D) NH3

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Q:

Which one of the following forms of phosphorus is most reactive?

A) Black phosphorus B) White phosphorus
C) Violet phosphorus D) Red phosphorus
 
Answer & Explanation Answer: B) White phosphorus

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Q:

The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?

A) 40 B) 60
C) 50 D) 20
 
Answer & Explanation Answer: A) 40

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Q:

When iron rusts, its weight .....

A) decreases B) increases
C) remains the same D) first increases and then decreases
 
Answer & Explanation Answer: B) increases

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