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Chemistry MCQ Questions with answers

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Learn Chemistry MCQs [Page 1 of Department 10]

B

Brijesh Goswami • 9.45K Points
Tutor III

1) Which Noble Gas has the highest First Ionization Energy?

(A) Neon
(B) Helium
(C) Argon
(D) Xenon
Correct Answer - Option (B)

Explanation:
Helium has the highest First Ionization Energy in the Noble Gases group. Ionization Energy :: Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells. Noble Gases have a very stable electron configuration, therefore, they have the highest amount of ionization energy within their periods. It decreases down a family because electrons farther from the nucleus are easier to remove. Ionization Energy levels of Noble Gases group in Descending Order :: He, Ne, Ar, Kr, Xe, Rn

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B

Brijesh Goswami • 9.45K Points
Tutor III

4) Methane contributes towards global warming so it is called a _________________ gas.

(A) poisonous
(B) carcinogenic
(C) infectious
(D) greenhouse
Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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B

Brijesh Goswami • 9.45K Points
Tutor III

6) Which one among the following is the heaviest

(A) 1 mole of water molecules
(B) 1 mole of ammonia molecules
(C) 1 mole of sodium atoms
(D) 1 mole of hydrogen molecules
Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

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B

Brijesh Goswami • 9.45K Points
Tutor III

9) Ethanol is converted into ethoxy ethane,

(A) by heating excess of ethanol with conc. H2SO4 at 140°C
(B) by treating with conc. H2SO4 at room temperature
(C) by treating with conc. H2SO4 at 273 K
(D) by heating Ethanol with excess of conc. H2SO4 at 443 K
Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

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