1099+ Important Chemistry MCQ Questions Answers

Q:

Fill in the blank with the most appropriate option.

Ethanol is denatured to ___.

A) make it unsuitable for drinking	B) make it suitable for drinking
C) increase its stability	D) make it suitable as an antiseptic

Answer & Explanation Answer: A) make it unsuitable for drinking

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

1 17822

Q:

Which solution is most concentrated?

A) 6 g of solute in 10 ml of solution	B) 20.5 g of solute in 50 ml of solution
C) 30 g of solute in 120 ml of solution	D) 2.6 g of solute in 2 ml of solution

Answer & Explanation Answer: D) 2.6 g of solute in 2 ml of solution

Explanation:

A concentrated solution will contain the most solute molecules per solvent molecules.

Here in the given options,

1) 6/10 = 0.6

2) 20.5/50 = 0.41

3) 30/120 = 0.25

4) 2.6/2 = 1.3

Hence, option D) is most concentrated.

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams , GATE
Job Role: Analyst , Bank Clerk , Bank PO

21 17807

Q:

Which one of the following mixture is homogeneous?

A) Water and oil	B) Starch and sugar crystals
C) Graphite and charcoal	D) Alloys

Answer & Explanation Answer: D) Alloys

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

1 17695

Q:

Which of the following statements is/are true or false?

Statements :

A) H2S burns in air to give H2O and SO2

B) The decomposition of Ferrous Sulphate into Fe2O3, SO2 and SO3 occurs in the presence of heat.

A) Statements A and B both are true	B) Statement A is true, while B is false
C) Statements A and B are false	D) Statement B is true, while A is false

Answer & Explanation Answer: A) Statements A and B both are true

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 17471

Q:

NH3 oxidation number?

A) -1	B) +1
C) 0	D) -3

Answer & Explanation Answer: C) 0

Explanation:

NH3, Ammonia is a neutral compound as the individual oxidation numbers elements that make up the compound NH3 are Nitrogen (N) and Hydrogen (H) sum to zero.

We do not speak of the oxidation number of a molecule. We can speak of the oxidation numbers of the individual elements that make up the compound.

Here the oxidation number of Nirogen is -3 and that of Hydrogen is +1.

Now, NH3 = 1(-3) + 3(+1) = -3 + 3 = 0.

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO , Database Administration , IT Trainer

31 17466

Q:

The absolute value of charge on electron was determined by

A) J.J.Thomson	B) R.A. Millikan
C) Rutherford	D) Chadwick

Answer & Explanation Answer: B) R.A. Millikan

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

59 17247

Q:

Which among the following statements are TRUE regarding synthetic fibre?

I. They melt after catching fire.

II. They are more durable.

III. They are prepared by a number of processes using petrochemicals.

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: D) All I, II and III

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 17050

Q:

The discovery of neutron became very late because

A) it is present in nucleus	B) it is a fundamental particle
C) it does not move	D) it does not carry any charge

Chemistry Questions

Quick Links