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Standard VI

Chemistry

Main Components

Then boiling ...

Question

Then boiling water ______ to it and the mixture is stirred vigorously.

had been added

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is being added

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was added

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is added

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Solution

The correct option is D is added
For a sentence in the simple present tense, while changing it from active to passive voice, we must add a 'to be' verb (is/am/are) followed by the past participle form of the verb. From the options given, options A) and B) are wrong because they are not in the right tense in this context.
Option C) was added is wrong because it has 'was' and not 'is'.
Option D) is added is the right answer.

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Similar questions

Q. A calorimeter contains

0.2 k g

of water at

30^{\circ} C

0.1 k g

of water at

60^{\circ} C

is added to it, the mixture is well stirred and the resulting temperature is found to be

35^{\circ} C

. The thermal capacity of the calorimeter is

Q. A calorimeter contains

0.2 k g

of water at

30^{\circ} C

0.1 k g

of water at

60^{\circ} C

is added to it, the mixture is well stirred and the resulting temperature is found to be

35^{\circ} C

. The thermal capacity of the calorimeter is ( specific heat of water

= 4200 J k g^{- 1} K^{- 1}

When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass remains unchanged. Give a reason.

Write down the changes that will be seen in each instance and explain the reason behind it.

(a) 50ml water is added to 50ml solution of copper sulphate.

(b) Two drops of the indicator phenlphthalein were added to 10ml solution of sodium hydroxide.

(d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.

(e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.

(f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.

(g) Dilute HCl was added to limestone.

(h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

(i) Dilute H 2 SO 4 was taken in an electrolytic cell and electric current was passed through it.

Assetion (A) When methyl alcohol is added to water, boiling point of water increases.
Reason (R) When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

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