Chemistry MCQ: Practice Questions & Answers (Marathi) - Page 5

ChemistryEasySolids, Liquids And Gases

81.

Boiling happens when

A

a gas turns to a solid

B

a liquid turns to a gas

C

a solid turns to a gas

D

a solid turns to a liquid

ChemistryEasySolids, Liquids And Gases

82.

A substance with a fixed shape is called a

A

foam

B

gas

C

liquid

D

solid

ChemistryEasySolids, Liquids And Gases

83.

A substance that is a liquid is

A

crystal

B

ice

C

steam

D

water

ChemistryEasySolids, Liquids And Gases

84.

A gas can be compressed because

A

gases have always got air in them

B

the particles can be squeezed

C

the particles shrink

D

there are gaps between the particles

ChemistryEasyRedox Reactions

85.

For the feasibility of redox reaction in a cell, the e.m.f. should be

A

Positive

B

Fixed

C

Zero

D

Negative

ChemistryEasyRedox Reactions

86.

The oxide, which cannot act as a reducing agent is

A

$CO_2$

B

$ClO_2$

C

$NO_2$

D

$SO_2$

ChemistryEasyRedox Reactions

87.

Oxidation state of Fe in $Fe_3O_4$ is

A

5/4

B

4/5

C

3/2

D

8/3

ChemistryEasyRedox Reactions

88.

Oxidation numbers of P in $PO_4^{3-}$ , of S in $SO_4^{2-}$ and that of Cr in $Cr_2O_7^{2-}$ are respectively

A

+3, +6 and +5

B

+5, +3 and +6

C

–3, +6 and +6

D

+5, +6 and +6

ChemistryEasyRedox Reactions

89.

What is n-factor?

A

Equal to product of Number of moles of electrons when Lost or gained by one mole of reductant or oxidant

B

When Number of moles of electrons Lost or gained by one mole of reductant or oxidant is not same.

C

Equal to Number of moles of electrons Lost or gained by one mole of reductant or oxidant

D

None of the above

ChemistryEasyRedox Reactions

90.

The tendency of an electrode to lose electrons is known as

A

Electrode Potential

B

Reduction Potential

C

Oxidation Potential

D

E.M.F.

ChemistryEasyRedox Reactions

91.

What is known as Autooxidation?

A

Formation of $H_2O$ by the oxidation of $H_2O_2$

B

Formation of $H_2O_2$ by the oxidation of $H_2O$

C

Both (1) and (2) are true

D

None of the above

ChemistryEasyRedox Reactions

92.

Which of the following elements does not show disproportionation tendency?

A

Cl

B

Br

C

F

D

I

ChemistryEasyRedox Reactions

93.

The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configurations the element will exhibit largest oxidation number?

A

3d14s2

B

3d2 4s2

C

3d54s1

D

3d54s2

ChemistryEasyRedox Reactions

94.

The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?

A

The oxidation number of hydrogen is always +1.

B

The algebraic sum of all the oxidation numbers in a compound is zero.

C

An element in the free or the uncombined state bears oxidation number zero.

D

In all its compounds, the oxidation number of fluorine is -1.

ChemistryEasyRedox Reactions

95.

Which reaction is not feasible?

A

2KI + $Br_2$ -> 2KBr + $I_2$

B

2KBr + $I_2$ -> 2KI + $Br_2$

C

2KBr + $Cl_2$ -> 2KCl+ $Br_2$

D

2H2O + 2F2 -> 4HF+ $O_2$

ChemistryEasyRedox Reactions

96.

Which of the following is a redox reaction?

A

$NaCl$ + $KNO_3$ -> $NaNO_3$ + $KCl$

B

$CaC_2O_4$ + 2HCl -> $CaCl_2$ + $H_2C_2O_4$

C

Mg (OH)2 + 2NH4Cl -> $MgCl_2$ + 2NH4OH

D

Zn + 2AgCN -> 2Ag + Zn (CN)2

ChemistryEasyRedox Reactions

97.

In oxygen di fluoride the oxidation number of oxygen is

A

-2

B

-1

C

2

D

+1, -2

ChemistryEasyRedox Reactions

98.

The oxidation number of Sulphur in $Na_2S_4O_6$ is

A

1.5

B

2.5

C

3

D

2

ChemistryEasyRedox Reactions

99.

A metal ion M3+ loses 3 electrons, its oxidation number will be

A

3

B

6

C

-3

ChemistryEasyRedox Reactions

100.

The oxidation number of Cl in $Cl_2O_7$ is

A

+7

B

5

C

3

D

-7

Chemistry : Practice Questions and Answers

Chemistry : Practice Questions and Answers