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

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Mole fraction of ${C H}_{3} O H$ in mixture containing ${C H}_{3} O H$ and $C_{2} H_{5} O H$ is 0.5. Hence mass percentage of ${C H}_{3} O H$ in the mixture is -

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Important Questions on Some Basic Concepts of Chemistry

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The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g of water is

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8 g

NaOH

is dissolved in

18 g

H_{2} O

. Mole fraction of

NaOH

in solution and molality (in

mol {kg}^{- 1}

) of the solution respectively are:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

If Avogadro's number is

A_{0}

, the number of sulphur atoms present in 200 mL of 1N

H_{2} {SO}_{4}

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

Which of the following is dependent on temperature?

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An organic compound contains

C, H

and

S

. The minimum molecular weight of the compound containing

8 %

Sulphur is

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What quantity (in

mL

) of a

45 %

acid solution of a mono-protic strong acid must be mixed with a

20 %

solution of the same acid to produce

800 mL

of a

29.875 %

acid solution?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

What is mole fraction of the solute in a

1.00

m aqueous solution?

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A solution is prepared by dissolving

20 g NaOH

1250 mL

of a solvent of density

0.8 g / mL .

Then the molality of the solution is;

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

The percentage composition of carbon by mole in methane is:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

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:

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Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is :

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

The number of water molecules is maximum in

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

The volume of 0.1 M strong dibasic acid sufficient to neutralize 1g of a base that furnishes 0.04 mole of

O H^{-}

in aqueous solution is :

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A solution (5 mL) of an acid X is completely neutralized by y mL of 1M NaOH. The same volume (y mL) of 1M NaOH is required to neutralize 10 mL of 0.6 M

H_{2} S O_{4}

completely. The normality (N) of the acid X is

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The mole fraction of a solvent in aqueous solution of a solute is

0.8 .

The molality (in mol

{k g}^{- 1}

) of the aqueous solution is:

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In which one of the following reactions, entropy decreases?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

The standard enthalpies of formation of

H_{2} O (l)

and

{CO}_{2} (g)

are respectively

- 286 kJ {mol}^{- 1}

and

- 394 kJ {mol}^{- 1}

. If the standard heat of combustion of

{CH}_{4} (g)

- 891 kJ {mol}^{- 1},

then the standard enthalpy of formation of

{CH}_{4} (g)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

In which case the number of molecules of water maximum?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Reactions in Solutions

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

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The amount of sugar

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

required to prepare

2 L

of its

0 .1 M

aqueous solution is:

Mole fraction of CH3OH in mixture containing CH3OH and C2H5OH is 0.5. Hence mass percentage of CH3OH in the mixture is -

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

Mole fraction of ${C H}_{3} O H$ in mixture containing ${C H}_{3} O H$ and $C_{2} H_{5} O H$ is 0.5. Hence mass percentage of ${C H}_{3} O H$ in the mixture is -