1099+ Important Chemistry MCQ Questions Answers

Q:

Who present the theory of radioactive disintegration

A) Rutherford and Soddy	B) Soddy and Fajan
C) Thomson and Rutherford	D) Hahn and strassman

Answer & Explanation Answer: A) Rutherford and Soddy

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

7 4388

Q:

Which of the following is a property of an acid?

A) Acids reacts with metals	B) Acids taste sour
C) Acids turn blue litmus paper red	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

The general properties of acids are as follows :-

1.They are sour to taste.

2.They turn blue litmus paper red but the red litmus paper have no effect of acids and it remains unaffected.

3.They release hydrogen ions H+ in the solution medium, making the conditions acidic.

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: Bank Exams

0 4366

Q:

The substances that are composed of to or more different elements in fixed proportion by mass are called

A) mixture	B) compound
C) element	D) None of these

Answer & Explanation Answer: B) compound

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

5 4341

Q:

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

(1) $K_{2} O < N a_{2} O < A l_{2} O_{3} < M g O$

(2) $A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O$

(3) $M g O < K_{2} O < A l_{2} O_{3} < N a_{2} O$

(4) $N a_{2} O < K_{2} O < M g O < A l_{2} O_{3}$

A) Option 1	B) Option 2
C) Option 3	D) Option 4

Answer & Explanation Answer: B) Option 2

Explanation:

While moving from left to right in periodic table basic character of oxide of elements will decrease.

$∴ \to_{I n c r e a \sin g b a s i c s t r e n g t h}^{A l_{2} O_{3} < M g O < N a_{2} O}$

and while descending in the group basic character of corresponding oxides increases.

$∴ \to_{I n c r e a \sin g b a s i c s t r e n g t h}^{N a_{2} O < K_{2} O}$

$∴ C o r r e c t O r d e r i s A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O$

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE

14 4312

Q:

Oxidation Number of 'S' in $H_{2} S O_{4}$ ?

A) +6	B) +2
C) -6	D) -2

Answer & Explanation Answer: A) +6

Explanation:

In $H_{2} S O_{4}$ ,

Hydrogen has a charge of +2, with each hydrogen has +1.

Oxygen has a charge of -8, with each oxugen has -2.

Total charge = (2 - 8) = -6

Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.

Report Error

View Answer Report Error Discuss

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

11 4260

Q:

Standard Electrode potential is measured in terms of

A) Pyrometer	B) Electrometer
C) Thermometer	D) Voltmeter

Answer & Explanation Answer: D) Voltmeter

Explanation:

Voltmeter is used to measure Standard Electrode Potential

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

6 4252

Q:

Fill in the blank with the most appropriate option.

An element attains stability when it achieves ________ state.

A) an only-duplet	B) an only-octet
C) a duplet or octet	D) a heptate

Answer & Explanation Answer: C) a duplet or octet

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

0 4250

Q:

A bond formed by sharing of electrons between atoms of the element is called

A) ionic bond	B) covalent bond
C) co ordinate bond	D) none

Chemistry Questions

Quick Links