5 moles of A B 2 weigh 125 × 10 - 3 k g and 10 moles of A 2 B 2 weigh 300 × 10 - 3 k g . The molar mass of A ( M A ) and molar mass of B ( M B ) in k g m o l - 1 are:

M A = 5 × 10 - 3 and M B = 10 × 10 - 3

M A = 25 × 10 - 3 and M B = 50 × 10 - 3

M A = 50 × 10 - 3 and M B = 25 × 10 - 3

M A = 10 × 10 - 3 and M B = 5 × 10 - 3

MEDIUM

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One litre of a gas at STP weights $1.16 g .$ The possible gas is:

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Important Questions on Some Basic Concepts of Chemistry

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

1 g

of an organic compound containing

C

and

H

, on complete combustion produced

3.04 g

{CO}_{2}

and

1.53 g

H_{2} O

. Find the approximate percentage composition of

C

and

H

in the compound.

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The empirical formula and molecular mass of a compound are

{CH}_{2} O

and

180 g

respectively. The molecular formula of the compound will be

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Calculate the mass of

AgCl

precipitated, when

25 ml

35 %

solution of

{AgNO}_{3}

and

25 ml

11.6 %

solution of

NaCl

are mixed is

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

In the crystalline solid

M S O_{4} \cdot n {II}_{2} O

of molar mass

250 g {mol}^{- 1},

the percentage of anhydrous salt is

64

by weight. The value of

n

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

An organic compound contains

C, H

and

S

. The minimum molecular weight of the compound containing

8 %

Sulphur is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

A metal

M

(specific heat

0.16

) forms a metal chloride with

65 %

chlorine present in it. The formula of the metal chloride will be

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

In a compound

C, H

and

N

are present in

9 : 1 : 3.5

by weight. If molecular weight of compound is

108

, the molecular formula of compound is

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

An organic compound contains

46.78 %

of a halogen

X

. When

2.00 g

of this compound is heated with fuming

{HNO}_{3}

in the presence of

{AgNO}_{3}, 2.21 g AgX

was formed. The halogen

X

is [Given : atomic weight of

Ag = 108, F = 19, Cl = 35.5

Br = 80, I = 127]

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The percentage composition of carbon by mole in methane is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

5

moles of

A B_{2}

weigh

125 \times 10^{- 3} k g

and

10

moles of

A_{2} B_{2}

weigh

300 \times 10^{- 3} k g

. The molar mass of A

(M_{A})

and molar mass of

B (M_{B})

k g {m o l}^{- 1}

are:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Which of the following has the largest number of atoms?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The number of water molecules is maximum in

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

At S.T.P. the volume of

7.5 g

of a gas is

5.6 L

. The gas is

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

How many moles of electrons will weigh one kilogram ?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The number of moles of water present in a spherical water droplet of radius

1.0 cm

is,
[Given : Density of water in the droplet

= 1.0 g {cm}^{- 3}

]

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The mass of oxygen gas which occupies

5.6

liters at

STP

would be

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Number of electrons present in

3.6 mg

{NH}_{4}^{+}

are

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Which of the following has the largest number of moles?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Suppose the elements

X

and

Y

combine to form two compounds

X Y_{2}

and

X_{3} Y_{2}

. When

0.1 mole

X Y_{2}

weighs

10 g

and

0.05 mole

X_{3} Y_{2}

weighs

9 g

, the atomic weights of

X

and

Y

are

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The amount of sugar

(C_{12} H_{22} O_{11})

required to prepare

2 L

of its

0 .1 M

aqueous solution is:

One litre of a gas at STP weights 1.16 g. The possible gas is:

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

One litre of a gas at STP weights $1.16 g .$ The possible gas is: