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RH₂ (ion exchange resin) can replace Ca²⁺ ions in hard water ${RH}_{2} + {Ca}^{2 +} \to RCa + 2 H^{+}$ . If 1 L of hard water after passing through RH₂ has pH = 3 then hardness in parts per million of Ca²⁺ is :

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Important Questions on Some Basic Concepts of Chemistry

EASY

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

What would be the molality of 20% (mass/mass) aqueous solution of

K I

? (molar mass of

K I = 166 g m o l^{- 1}

)

EASY

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

Which of the following is dependent on temperature?

MEDIUM

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

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:

MEDIUM

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

In which one of the following reactions, entropy decreases?

HARD

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}

MEDIUM

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)

MEDIUM

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

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 :

MEDIUM

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

A gas mixture contains

25 %

He

and

75 % {CH}_{4}

by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately ___ .

MEDIUM

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

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

MEDIUM

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

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

MEDIUM

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

The mole fraction of glucose

(C_{6} H_{12} O_{6})

in an aqueous binary solution is

0.1 .

The mass percentage of water in it, to the nearest integer, is

\dots \dots \dots

EASY

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?

EASY

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

Dissolving

120 g

of urea in

1000 g

of water gave a solution of density

1.15 g / mL .

The molarity of the solution is:

MEDIUM

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

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;

EASY

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

Calculate the concentration of the

2 % (w / w) NaCl

solution in terms of molality.

EASY

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

While combusting in air,

4 g

H_{2}

gas was completely converted into water. If

36 μmole

{CO}_{2}

from air is dissolved into that water, what is the concentration of

{CO}_{2}

EASY

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

A litre of seawater (which weighs

1030 g

) contains

6 \times 10^{- 3} g

of dissolved oxygen. The concentration of dissolved oxygen in

ppm

is:

HARD

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

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?

EASY

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

The weight percent of sucrose (formula weight

= 342 g m o l^{- 1}

) in an aqueous solution is

3.42

. The density of the solution is

1 g m L^{- 1},

the concentration of sucrose in the solution in

m o l L^{- 1}

EASY

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

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:

RH2 (ion exchange resin) can replace Ca2+ ions in hard water RH 2 + Ca 2 + → RCa + 2 H + . If 1 L of hard water after passing through RH2 has pH = 3 then hardness in parts per million of Ca2+ is :

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

RH₂ (ion exchange resin) can replace Ca²⁺ ions in hard water ${RH}_{2} + {Ca}^{2 +} \to RCa + 2 H^{+}$ . If 1 L of hard water after passing through RH₂ has pH = 3 then hardness in parts per million of Ca²⁺ is :