Question 1: Palette 1/20

JEE Advanced 2022 MSQ

To check the principle of multiple proportions, a series of pure binary compounds $\left(\mathrm{P}_{\mathrm{m}} \mathrm{Q}_{\mathrm{n}}\right)$ were analyzed and their composition is tabulated below. The correct option(s) is(are)

Compound	Weight % of $\mathrm{P}$	Weight % of $\mathrm{Q}$
1	50	50
2	44.4	55.6
3	40	60

A

If empirical formula of compound 3 is $P_{3} Q_{4}$, then the empirical formula of compound 2 is $\mathrm{P}_{3} \mathrm{Q}_{5}$.

B

If empirical formula of compound 3 is $\mathrm{P}_{3} \mathrm{Q}_{2}$ and atomic weight of element $\mathrm{P}$ is 20 , then the atomic weight of $\mathrm{Q}$ is 45 .

C

If empirical formula of compound 2 is $P Q$, then the empirical formula of the compound $\mathbf{1}$ is $\mathrm{P}_{5} \mathrm{Q}_{4}$.

D

If atomic weight of $\mathrm{P}$ and $\mathrm{Q}$ are 70 and 35 , respectively, then the empirical formula of compound $\mathbf{1}$ is $\mathrm{P}_{2} \mathrm{Q}$.

Question 2: Palette 2/20

JEE Advanced 2011 MCQ

Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is

A

1.78 M

B

2.00 M

C

2.05 M

D

2.22 M

Question 3: Palette 3/20

JEE Advanced 2009 MCQ

Given that the abundances of isotopes ⁵⁴Fe, ⁵⁶Fe and ⁵⁷Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is :

A

55.85

B

55.95

C

55.75

D

56.05

Question 4: Palette 4/20

JEE Advanced 2007 MCQ

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

3

B

4

C

5

D

6

Question 5: Palette 5/20

JEE Advanced 2003 MCQ

Mixture X = 0.02 mol of [Co(NH₃)₅SO₄]Br and 0.02 mol of [Co(NH₃)₅Br]SO₄ was prepared in 2 litre of solution.
1 litre of mixture X + excess AgNO₃ $ \to $ Y.
1 litre of mixture X + excess BaCl₂ $ \to $ Z
No. of moles of Y and Z are

A

0.01, 0.01

B

0.02, 0.01

C

0.01, 0.02

D

0.02, 0.02

Question 6: Palette 6/20

JEE Advanced 2003 MCQ

Which has maximum number of atoms?

A

24 g of C(12)

B

56g of Fe(56)

C

27g of Al(27)

D

108g of Ag(108)

Question 7: Palette 7/20

JEE Advanced 2002 MCQ

How many moles of electron weigh one kilogram?

A

$6.023 \times {10^{23}}$

B

${1 \over {9.108}} \times {10^{31}}$

C

${{6.023} \over {9.108}} \times {10^{54}}$

D

${1 \over {9.108 \times 6.023}} \times {10^8}$

Question 8: Palette 8/20

JEE Advanced 2001 MCQ

In the standardization of Na₂S₂O₃ using K₂Cr₂O₇ by iodometry, the equivalent weight of K₂Cr₂O₇ is:

A

(molecular weight)/2

B

(molecular weight)/6

C

(molecular weight)/3

D

Same as molecular weight

Question 9: Palette 9/20

JEE Advanced 2001 MCQ

An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250ml. the volume of 0.1N NaOH required to completely neutralize 10ml of this solution is :

A

40ml

B

20ml

C

10ml

D

4ml

Question 10: Palette 10/20

JEE Advanced 1991 MCQ

Read the following statement and explanation and answer as per the options given below:

STATEMENT (S): In the titration of Na₂CO₃ with HCl using methyl orange indicator, the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator.

EXPLANATION (E): Two moles of HCl are required for the complete neutralization of one mole of Na₂CO₃

A

Both S and E are true, and E is the correct explanation of S.

B

Both S and E are true, and E is not the correct explanation of S.

C

S is true but E is false

D

S is false but E is true

Question 11: Palette 11/20

JEE Advanced 1991 MCQ

The oxidation state of the most electronegative element in the products of the reaction. BaO₂ with dil. H₂SO₄ are

A

0 and -1

B

-1 and -2

C

-2 and 0

D

-2 and -1

Question 12: Palette 12/20

JEE Advanced 1988 MCQ

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

A

Molarity

B

Normality

C

Formality

D

Molality

Question 13: Palette 13/20

JEE Advanced 1986 MCQ

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

A

1000 g of solvent

B

1.0 L of solvent (1986, 1M)

C

1.0 L of solution

D

22.4 L of solution

Question 14: Palette 14/20

JEE Advanced 1981 MCQ

If 0.50 mol of BaCl₂ is mixed with 0.20 mol of Na₃PO₄, the maximum amount of Ba₃(PO₄)₂ that can be formed is

A

0.70

B

0.50

C

0.20

D

0.10

Question 15: Palette 15/20

JEE Advanced 1979 MCQ

2.76 g of silver carbonate on being strongly heated yields a residue weighing

A

2.16 g

B

2.48 g

C

2.32 g

D

2.64 g

Question 16: Palette 16/20

JEE Advanced 1979 MCQ

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

A

22

B

44

C

66

D

88

Question 17: Palette 17/20

JEE Advanced 1979 MCQ

The largest number of molecules is in

A

32 g of water

B

28 g of carbon monoxide

C

46 g of ethyl alcohol

D

54 g of nitrogen pentoxide

Question 18: Palette 18/20

JEE Advanced 1979 MCQ

A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore the ratio of their no of molecules is

A

1 : 4

B

1 : 8

C

7 : 32

D

3 : 16

Question 19: Palette 19/20

JEE Advanced 1978 MCQ

A compound was found to contain nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of compound is

A

NO

B

N₂O₃

C

N₂O₅

D

N₂O₄

Question 20: Palette 20/20

JEE Advanced 1978 MCQ

27 g of Al will react completely with how many grams if oxygen?

A

8 g

B

16 g

C

32 g

D

24 g