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

If Avogadro number N A , is changed from 6.022 × 10 23 m o l - 1 to 6.022 × 10 20 m o l - 1 , this would change:

The definition of mass in units of grams

The ratio of chemical species to each other in a balanced equation.

The ratio of elements to each other in a compound.

MEDIUM

Earn 100

$0.05 cm$ thick coating of silver is deposited on a plate of $0.05 m^{2}$ area. The number of silver atoms deposited on plate are ____________ $\times 10^{23}$ . (At mass Ag $= 108, d = 7.9 g {cm}^{- 3})$

Round off to the nearest integer.

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Important Questions on Some Basic Concepts of Chemistry

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

The first and second ionisation enthalpies of a metal are

496

and

4560 k J m o l^{- 1}

, respectively. How many moles of

H C l

and

H_{2} S O_{4},

respectively, will be needed to react completely with

1

mole of the metal hydroxide?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

The amount of oxygen in

3.6

moles of water is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

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:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

Which of the following has the largest number of moles?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

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

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

One mole of carbon atom weighs

12 g

, the number of atoms in it is equal to, (Mass of carbon

- 12

1.9926 \times 10^{- 23} g)

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

Which of the following has the largest number of atoms?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :(Atomic wt. of

Cl = 35 .5 u;

Avogadro constant

= 6 .023 \times 10^{23} {mol}^{- 1}

)

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

The volume of oxygen at STP required to burn 2.4 g of carbon completely is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

Calculate the number of sulphate ions present in

100 ml

0.001 M H_{2} {SO}_{4} ?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

If Avogadro number

N_{A}

, is changed from

6.022 \times 10^{23} m o l^{- 1}

6.022 \times 10^{20} m o l^{- 1}

, this would change:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

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

Which one of the followings has maximum number of atoms?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

How many moles of electrons will weigh one kilogram ?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

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

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

An amount of

18 g

glucose corresponds to:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

A mixture of gases contains

H_{2}

and

O_{2}

gases in the ratio of

1 : 4

(w/w). What is the molar ratio of the two gases in the mixture?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept

The number of water molecules is maximum in

0.05 cm thick coating of silver is deposited on a plate of 0.05 m2 area. The number of silver atoms deposited on plate are ____________×1023. (At mass Ag =108, d=7.9 g cm-3 Round off to the nearest integer.

Important Questions on Some Basic Concepts of Chemistry

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$0.05 cm$ thick coating of silver is deposited on a plate of $0.05 m^{2}$ area. The number of silver atoms deposited on plate are ____________ $\times 10^{23}$ . (At mass Ag $= 108, d = 7.9 g {cm}^{- 3})$

Round off to the nearest integer.