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Standard XII

Chemistry

Types of Redox Reactions

Which of the ...

Question

Which of the following are irreversible processes?

Mixing of two gases

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Evaporation of water at

373 K

and 1 atm in a closed system

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Dissolution of

N a C l

in water

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H_{2} O (s)

- 4^{\circ} C

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Solution

The correct options are
B Mixing of two gases
C Dissolution of $N a C l$ in water
An irreversible process increases the entropy of the universe.

In a irreversible reaction, the reactants react to form the products, which cannot revert back into reactants. In reversible reactions, as the reactants react with other reactants to form products, the products are reacting with other products to form reactants. Example, mixing of two gases and dissolution of salt in water.

Suggest Corrections

Similar questions

Q. For

1

molar solution of

N a C l

in water at

25^{o}

C and

1

-atm pressure show that:

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K. If pressure of the system is increased to 2 atm while keeping temperature constant, which of the following would be the correct observation ?

Q. (a) Classify the following processes as reversible or irreversible:
(i) Dissolution of sodium chloride.
(ii) Evaporation of water at

373 K

and

1 a t m

pressure.
(iii) Mixing of two gases by diffusion.
(iv) Melting of ice without rise in temperature.
(b) When an ideal gas expands in vaccum, there is neither absorption nor revalutions of what? why?

Q. The molar enthalpy change for

H_{2} O (l) ⇌ H_{2} O (g)

373

K and

1

atm is

41 k J / m o l

. Assuming ideal behavior, the internal energy change for vaporization of

1

mol of water at

373 K

and

1

atm in kJ mol

^{- 1}

is:

Q. Fill in the blanks with the correct words.

1. All the three states of water are .................... (reversible/irreversible).
2. Water freezes to ice at .................... (100/0)°C.
3. The continuous circulation of water in natural is called the .................... (hydrogen/hydrological) cycle.
4. .................... (Dams/Wells) are built on rivers to regulate water flow and distribute water more evenly.
5. Water levels in rivers increase greatly during .................... (winter/monsoon).

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