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JEE Advanced > Some Basic Concepts of Chemistry

Explore popular questions from Some Basic Concepts of Chemistry for JEE Advanced. This collection covers Some Basic Concepts of Chemistry previous year JEE Advanced questions hand picked by experienced teachers.

Q 1.

Correct4

Incorrect-1

{tex} 27 \mathrm { g } {/tex} of {tex}\mathrm {Al}{/tex} will react completely with how many grams of oxygen?

A

{tex} 8 \mathrm g {/tex}

B

{tex} 16 \mathrm { g } {/tex}

C

{tex} 32 \mathrm { g } {/tex}

{tex} 24 \mathrm { g } {/tex}

Explanation

Q 2.

Correct4

Incorrect-1

A compound was found to contain nitrogen and oxygen in the ratio {tex}\mathrm{28gm}{/tex} and {tex}\mathrm{80gm}{/tex} respectively. the formula of the compound is

A

{tex} \mathrm { NO } {/tex}

B

{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 3 } {/tex}

{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 5 } {/tex}

D

{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 4 } {/tex}

Explanation

Q 3.

Correct4

Incorrect-1

The largest number of molecules is in

{tex} 36 \mathrm { g } {/tex} of water

B

{tex} 28 \mathrm { g } {/tex} of carbon monoxide

C

{tex} 46 \mathrm { g } {/tex} of ethyl alcohol

D

{tex}54 \mathrm g {/tex} of nitrogen pentoxide

Explanation

Q 4.

Correct4

Incorrect-1

The total number of electrons in one molecule of carbon dioxide is

22

B

44

C

66

D

88

Explanation

Q 5.

Correct4

Incorrect-1

A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore the ratio of their number of molecules is

A

1:4

B

1:8

7:32

D

3:16

Explanation


Q 6.

Correct4

Incorrect-1

{tex} 2.76 \mathrm { g } {/tex} of silver carbonate on being strongly heated yields a residue weighing

{tex} 2.16 \mathrm { g } {/tex}

B

{tex} 2.48 \mathrm g {/tex}

C

{tex} 2.32 \mathrm { g } {/tex}

D

{tex} 2.64 \mathrm g {/tex}

Explanation

Q 7.

Correct4

Incorrect-1

{tex}\mathrm M {/tex} is molecular weight of {tex} \mathrm { KMnO } _ { 4 } {/tex}. The equivalent weight of {tex} \mathrm { KMnO } _ { 4 } {/tex} when it is converted into {tex} \mathrm { K } _ { 2 } \mathrm { MnO } _ { 4 } {/tex} is

{tex} \mathrm M{/tex}

B

{tex} \mathrm { M } \mathrm / \mathrm 3 {/tex}

C

{tex} \mathrm { M } / \mathrm { 5 } {/tex}

D

{tex} \mathrm { M } \mathrm / \mathrm 7 {/tex}

Explanation

Q 8.

Correct4

Incorrect-1

If {tex}0.50{/tex} mole of {tex} \mathrm { BaCl } _ { 2 } {/tex} is mixed with {tex} 0.20 \mathrm { mol } {/tex} of {tex} \mathrm { Na } _ { 3 } \mathrm { PO } _ { 4 } {/tex}, the maximum number of moles of {tex} \mathrm { Ba } _ { 3 } \left( \mathrm { PO } _ { 4 } \right) _ { 2 } {/tex} that can be formed is

A

0.7

B

0.5

C

0.2

0.1

Explanation

Q 9.

Correct4

Incorrect-1

One mole of {tex} \mathrm { N } _ { 2 } \mathrm { H } _ { 4 } {/tex} loses ten moles of electrons to form a new compound {tex}\mathrm Y {/tex}. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in {tex} \mathrm Y {/tex} (There is no change in the oxidation state of hydrogen).

A

{tex}\mathrm -1{/tex}

B

{tex}\mathrm -3{/tex}

{tex}\mathrm + 3 {/tex}

D

{tex} \mathrm + 5 {/tex}

Explanation

Q 10.

Correct4

Incorrect-1

The oxidation number of carbon in {tex} \mathrm { CH } _ { 2 } \mathrm { O } {/tex} is

A

{tex} - 2 {/tex}

B

{tex} + 2 {/tex}

{tex}\mathrm 0{/tex}

D

{tex} + 4 {/tex}

Explanation

Q 11.

Correct4

Incorrect-1

A molal solution is one that contains one mole of a solute in:

{tex} 1000 \mathrm { g } {/tex} of the solvent

B

one litre of the solvent

C

one litre of the solution

D

{tex} \mathrm 22.4 {/tex} litres of the solution

Explanation

Q 12.

Correct4

Incorrect-1

The brown ring complex compound is formulated as {tex} \left[ \mathrm { Fe } \left( \mathrm { H } _ { 2 } \mathrm { O } \right) _ { 5 } ( \mathrm { NO } ) \right] \mathrm { SO } _ { 4 } {/tex}. The oxidation state of iron is:

A

{tex}\mathrm 1{/tex}

{tex}\mathrm 2{/tex}

C

{tex}\mathrm 3{/tex}

D

{tex}\mathrm 0{/tex}

Explanation

Q 13.

Correct4

Incorrect-1

The equivalent weight of {tex}\mathrm{MnSO_{4}}{/tex}, is half of its molecular weight when it is converted to:

A

{tex} \mathrm { Mn } _ { 2 } \mathrm { O } _ { 3 } {/tex}

{tex} \mathrm { MnO } _ { 2 } {/tex}

C

{tex} \mathrm {{ MnO} _ { 4 }}^{-} {/tex}

D

{tex} \mathrm { MnO } _ { 4 } ^ { 2- } {/tex}

Explanation

Q 14.

Correct4

Incorrect-1

In which mode of expression, the concentration of a solution remains independent of temperature?

A

Molarity

B

Normality

C

Formality

Molality

Explanation

Q 15.

Correct4

Incorrect-1

The oxidation number of phosphorus in {tex} \mathrm { Ba } \left( \mathrm { H } _ { 2 } \mathrm { PO } _ { 2 } \right) _ { 2 } {/tex} is:

A

{tex}\mathrm +3{/tex}

B

{tex} \mathrm+2 {/tex}

{tex} \mathrm +1 {/tex}

D

{tex} \mathrm- 1 {/tex}

Explanation

Q 16.

Correct4

Incorrect-1

The oxidation states of the most electronegative element in the products of the reaction, {tex} \mathrm { BaO } _ { 2 } {/tex} with dil. {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} is

A

{tex} \mathrm 0 {/tex} and {tex} - 1 {/tex}

{tex} - 1 {/tex} and {tex} - 2 {/tex}

C

{tex} - 2 {/tex} and {tex} \mathrm 0 {/tex}

D

{tex} - 2 {/tex} and {tex} - 1 {/tex}

Explanation

Q 17.

Correct4

Incorrect-1

For the redox reaction:
{tex} \mathrm { MnO } _ { 4 }^{-} + \mathrm { C } _ { 2 } \mathrm { O } _ { 4 } ^ { 2- } + \mathrm { H } ^ { + } \rightarrow \mathrm { Mn } ^ { 2 + } + \mathrm { CO } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O } {/tex}
the correct coefficients of the reactants for the balanced reaction are
{tex} \mathrm { MnO } _ { 4}^{-} \quad \mathrm { C } _ { 2 } \mathrm { O } _ { 4 } ^ { 2- } \quad \mathrm {H}^{+} {/tex}

{tex} 2 \quad 5 \quad 16 {/tex}

B

{tex} 16 \quad 5 \quad 2 {/tex}

C

{tex} 5 \quad 16 \quad 2 {/tex}

D

{tex} 2 \quad 16 \quad 5 {/tex}

Explanation

Q 18.

Correct4

Incorrect-1

The normality of {tex} 0.3 \mathrm { M } {/tex} phosphorous acid {tex} \left( \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } \right) {/tex} is,

A

{tex}\mathrm 0.1{/tex}

B

{tex}\mathrm 0.9{/tex}

C

{tex} \mathrm 0.3 {/tex}

{tex} \mathrm 0.6 {/tex}

Explanation

Q 19.

Correct4

Incorrect-1

The oxidation number of sulphur in {tex} \mathrm { S } _ { 8 } , \mathrm { S } _ { 2 } \mathrm { F } _ { 2 } , \mathrm { H } _ { 2 } \mathrm { S } {/tex} respectively, are

{tex} 0 , + 1 {/tex} and {tex} - 2 {/tex}

B

{tex} + 2 , + 1 {/tex} and {tex} - 2 {/tex}

C

{tex} 0 , + 1 {/tex} and {tex} + 2 {/tex}

D

{tex} - 2 , + 1 {/tex} and {tex} - 2 {/tex}

Explanation

Q 20.

Correct4

Incorrect-1

Amongst the following identify the species with an atom in {tex} + 6 {/tex} oxidation state

A

{tex} \mathrm { MnO } _ { 4 }^{-}{/tex}

B

{tex} \mathrm { Cr } ( \mathrm { CN } ) _ { 6 } ^ { 3 -} {/tex}

C

{tex} \mathrm { NiF } _ { 6 } ^ { 2- } {/tex}

{tex} \mathrm { CrO } _ { 2 } \mathrm { Cl } _ { 2 } {/tex}

Explanation

Q 21.

Correct4

Incorrect-1

In the standardization of {tex} \mathrm { Na } _ { 2 } \mathrm { S } _ { 2 } \mathrm { O } _ { 3 } {/tex} using {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex} by iodometry, the equivalent weight of {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex} is

A

(molecular weight) {tex} / 2 {/tex}

(molecular weight) {tex} / 6 {/tex}

C

(molecular weight) {tex} / 3 {/tex}

D

same as molecular weight

Explanation

Q 22.

Correct4

Incorrect-1

Which has maximum number of atoms?

{tex} 24 \mathrm { g } {/tex} of {tex} \mathrm { C } ( 12 ) {/tex}

B

{tex} 56 \mathrm g {/tex} of {tex} \mathrm { Fe } ( 56 ) {/tex}

C

{tex} 27 \mathrm g {/tex} of {tex} \mathrm { Al } ( 27 ) {/tex}

D

{tex} 108 \mathrm g {/tex} of {tex} \mathrm { Ag } ( 108 ) {/tex}

Explanation