Which of the following processes enable pure water to be obtained from seawater?
I filtration
II distillation
III evaporation

I and II only

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I and III only

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II and III only

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I,II and III

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Solution

The correct option is C II and III only
Distillation and evaporation enables pure water to obtained from seawater,
both these process includes the evaporation of water and then condensing the water vapours to obtain pure form of water.

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Question 12

Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid.
(ii) Sublimation of dry ice.
(iii) Condensation of water vapours.
(iv) Evaporation of water.

(a) (i) and (iii)
(b) (ii) only
(c) (iii) only
(d) (ii) and (iv)

Which of the following process / processes release heat ?
(i) condensation (ii) vaporisation (iii) freezing (iv) melting

(a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

Q. Which of the following statements are true for pure substances ?
(i) pure substances contain only one kind of particles
(ii) pure substances may be compounds or mixtures
(iii) pure substances have the same composition throughout
(iv) pure substances can be exemplified by all elements other than nickel

(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)

Q. In the given figure, which of the following statements must be true?
(i) a + b = d + c

(ii) a + c + e = 180°

(iii) b + f = c + e

(a) (i) only

(b) (ii) only

(c) (iii) only

(d) (ii) and (iii) only

Which of the following graphs represents exothermic reaction ?

(a) Only I
(b) Only II
(c) Only III
(d) I and II

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Which of the following processes enable pure water to be obtained from seawater?I filtrationII distillationIII evaporation

The correct option is C II and III onlyDistillation and evaporation enables pure water to obtained from seawater,both these process includes the evaporation of water and then condensing the water vapours to obtain pure form of water.

Which of the following processes enable pure water to be obtained from seawater?
I filtration
II distillation
III evaporation

The correct option is C II and III only
Distillation and evaporation enables pure water to obtained from seawater,
both these process includes the evaporation of water and then condensing the water vapours to obtain pure form of water.