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 Chemistry Questions

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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:

Isotones have always ______

A) Same number of protons B) Same atomic number
C) Same number of neutron D) Same number of proton and same numbe of neutron
 
Answer & Explanation Answer: C) Same number of neutron

Explanation:
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Q:

Bauxite is an ore/mineral of

A) Aluminium B) Beryllium
C) Lead D) Tin
 
Answer & Explanation Answer: A) Aluminium

Explanation:
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Q:

Bee sting contains________________

A) An acidic liquid B) a salt solution
C) an alkaline liquid D) a corrosive liquid
 
Answer & Explanation Answer: A) An acidic liquid

Explanation:
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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

Explanation:
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Q:

Which of the following can be beaten and converted into thin sheets?

A) Zinc B) Phosphorus
C) Sulphur D) Oxygen
 
Answer & Explanation Answer: A) Zinc

Explanation:
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Q:

The Chemical formula of Aluminium Chloride is _____.

A) AlCl B) AlCl2
C) AlCl3 D) Al2Cl3
 
Answer & Explanation Answer: C) AlCl3

Explanation:
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Q:

There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as

A) isotones B) isochores
C) isobars D) isotopes
 
Answer & Explanation Answer: C) isobars

Explanation:

Isotopes-These  are  atoms  of  the elements  having  the  same  atomic number but different mass number.,  Isobars-These  are atoms of same mass number but different atomic  number.,  Isotones-These are  atoms  of  different  elements having same number of neutrons.

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