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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.

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Some Basic Concepts of Chemistry

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Q 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

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Q 2. 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


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Q 3. 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

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Q 4. 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

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Q 5. 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

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Q 6. 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

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Q 7. 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

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Q 8. Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

A

{tex}\mathrm 3{/tex}

B

{tex}\mathrm 4{/tex}

C

{tex}\mathrm 5{/tex}

{tex}\mathrm 6{/tex}

Explanation

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Q 9.

In which of the following pairs do the two species resemble each other most closely in chemical properties?

B

C

D

Explanation

and are isotopes. Thus, they resemble very closely in their chemical properties

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Q 10.

Number of moles of reduced by 1 mol of is

B

C

D

1

Explanation

mol of mol of

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Q 11.

A mixed solution of potassium hydroxide and sodium carbonate required of an solution when titrated with phenolphthalein as an indicator. But the same amount of the solution when titrated with methyl orange as indicator required 25 mL of the same acid. the amount of KOH present in the solution is

0.014 g

B

0.14 g

C

0.028 g

D

1.4 g

Explanation

KOH +

( mmol) ( mmol)

i.

ii. and

KOH mmoles

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Q 12.

The volume strength of 1.5 N solution is

A

4.8

8.4

C

3

D

8

Explanation

68 g 22.4 L (at STP)

Mass of in 1.5 N solution of N

g

So, volume strength of 1.5 N solution

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Q 13.

A solution of 200 ppt is

A

B

Both (a) & (b)

D

None of these

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Q 14.

Which gives ppt with ?

B

C

D

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Q 15.

Mass of one atom of the element is How many atoms are contained in 1 g of the element

B

C

D

Explanation

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Q 16.

1.056 g of the was treated with of After reaction was over, 0.601 g of Sn was recovered. Thus, empirical formula of the compound formed is

A

B

C

Explanation

taken

unreacted

reacted

Thus,

Thus, empirical formula is or

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Q 17.

0.4 mole of and 0.2 mole of were dissolved in water to have of solution, the molarity of ion is

A

0.8 M

1.6 M

C

1.2 M

D

10.0 M

Explanation

Total moles solution

Thus, molarity

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Q 18.

Match the substances given in based on reactions given in select correct answer from the alternate


(Reaction)

A

B

D

Explanation

I.

II.

conc. charred

mass

III.

brown fumes

IV.

Bleaching agent

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Q 19.

A mixture contains and . Following steps have been adopted but written in disorder

I: Filter, boil of

II: Filter, add and pass gas

III: Pass gas into acidified solution of mixture

A

I, II, III

III, I, II

C

III, II, I

D

I, III, II

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Q 20.

The reaction between yttrium metal and dilute produces and ions. The molar ratio of yttrium to that hydrogen produced is

2:3

B

3:2

C

1:2

D

2:1

Explanation

1 eq if Y = 1 eq of

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Q 21.

A 500 g toothpaste contains 0.2 g fluoride. The concentration of fluoride in terms of ppm is

A

100

B

250

400

D

450

Explanation

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Q 22.

at NTP is obtained by heating g of pure is

A

100 g

200 g

C

50 g

D

44.8 g

Explanation

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Q 23.

A hydrate of has 50% water by mass. It is

A

B

D

Explanation

Mole

Ratio: 1:7

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Q 24.

Potassium selenate is isomorphous with potassium sulphate and contains 50.0% of Se. Find the atomic weight of Se

142

B

71

C

47.33

D

284

Explanation

and are isomorphous

of of Se

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Q 25.

Oxalic acid forms two series of salt and If 0.9 g of oxalic acid is in solution, and have normality respectively

A

0.1 N, 0.1 N

0.1 N, 0.2 N

C

0.2 N, 0.2 N

D

0.2 N, 0.1 N

Explanation

Upto stage I-monobasic acid

II-dibasic acid