1099+ Important Chemistry MCQ Questions Answers

Q:

Alkali metals can

A) be highly unstable at room temperature	B) vaporize at room temperature
C) easily gain electrons	D) easily lose electrons

Answer & Explanation Answer: D) easily lose electrons

Explanation:

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Q:

______ decreases the rate of setting of cement.

A) Alumina	B) Silica
C) Gypsum	D) Magnesium oxide

Answer & Explanation Answer: C) Gypsum

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Q:

Which of the following gases is not generated in a biogas plant?

A) H2S	B) CO2
C) CH4	D) CO

Answer & Explanation Answer: D) CO

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Q:

How many atoms are present in a $(NH$ ₄)2SO4 molecule?

A) 15	B) 14
C) 13	D) 12

Answer & Explanation Answer: A) 15

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Q:

Which of the following is an ore of Aluminium?

A) Galena	B) Cryollite
C) Cinnabar	D) Epsom Salt

Answer & Explanation Answer: B) Cryollite

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Q:

Which element has the lowest ionization energy?

A) He	B) Ne
C) Fr	D) Rb

Answer & Explanation Answer: C) Fr

Explanation:

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.

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.

HGence, in this trend Francium (Fr) has the lowest ionization energy.

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Q:

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1st group and the 4th period?

A) 21	B) 17
C) 19	D) 9

Answer & Explanation Answer: C) 19

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Q:

Which of the following is not soluble in water?

A) Lead sulphate	B) Zinc sulphate
C) Potassium sulphate	D) Sodium sulphate

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