Which of the following are characteristics/properties of permanent hardness in water? (A) Presence of bicarbonates of calcium and magnesium (B) Presence of sulphates of calcium and magnesium (C) Forms good lather when comes in contact with soap (D) Presence of chloride of calcium and magnesium (E) Can be removed by boiling the water Choose the correct answer from the options given below :

Which of the given statements about hard water is/are correct: 1. Contains sulfates, chlorides, bicarbonates of calcium and magnesium. 2. Hard water forms lather with both soap and detergent.

A

Only 1

B

Only 2

C

Both 1 and 2 are correct

D

Neither 1 nor 2 are correct

Read the given statements carefully and answer the questions. Statement: Sunil has only Rs 100. He has to buy a soap, an oil bottle, a kilo of potatoes and a chocolate. Which of the following combinations would Sunil buy? A. An oil bottle of Rs 44, chocolate of Rs 23, soap of Rs 2 and half kg of potatoes of Rs 16. B. An oil bottle of Rs 40, chocolate of Rs 20, soap of Rs 17 and a kg of potatoes for Rs 34. C. Half a kilo potato of Rs 12, soap of Rs 23, chocolate of Rs 5 and an oil bottle of Rs 39. D. Chocolate of Rs 50, soap of Rs 7, an oil bottle of Rs 30 and a kg of potato of Rs 29 per kg.

A

C

B

A

C

B

D

Which of the following statement(s) is/are correct?
1. If sodium carbonate and washing soda is mixed in water the hardness of water can be removed.
2. The reaction of the chemicals produce sodium sulphate, sodium carbonate and insoluble calcium carbonate.
3. Magnesium sulphate chloride and magnesium carbonate is also produced.
Select the correct answer

A

Only 1

B

1, 2 and 3

C

2 and 3

D

None of these

Which among the following statements is/are true? Exposure of silver chloride to sunlight for a long duration turns grey due to 1. the formation of silver by decomposition of silver chloride 2. sublimation of silver chloride 3. decomposition of chlorine gas from silver chloride 4. oxidation of silver chloride Select the correct answer using the codes given below.

A

Only 1

B

1 and 3

C

2 and 3

D

Only 4

E

None of the above/More than one of the above

Read the instructions below and answer the questions that follow: P * Q means “some P are Q”. P – Q means “all P are Q”. P + Q means “no P is Q”. Now, statements below are followed by two conclusions. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: Ant * hall Hall * soap Soap + dog Dog * doll Conclusions: I. Ant * soap II. Soap + doll

A

Only I follows

B

Only II follows

C

Either I or II follows

D

Neither I nor II follows

E

Both I and II follow

In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?

A

Clark’s method

B

Hehner’s method

C

Versenate method

D

EDTA method

Which of the following features of the Permanent Settlements of 1793 is/are correct? 1. The Permanent Settlements vested land ownership rights in the peasants 2. The Permanent Settlement vested land ownership rights in the Zamindars 3. The Zamindars had to pay a fixed amount of rent by a particular date 4. The Zamindars benefited hugely from the Permanent Settlement while the peasants suffered Select the correct answer using the code given below:

A

1 only

B

2 and 3 only

C

4 only

D

1, 2 and 3

Assertion (A) : Synthetic detergents can lather when in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

A

Both A and R is true and R is the correct explanation of A

B

Both A and R is true but R is not a correct explanation of A

C

A is true but R is false

D

A is false but R is true

Assertion (A) : Synthetic detergents can lather when in hard water.
Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

A

Both A and R is true and R is the correct explanation of A

B

Both A and R is true but R is not a correct explanation of A

C

A is true but R is false

D

A is false but R is true

Assertion (A) Synthetic detergents can lather well in hard water.
Reason (R) Synthetic detergents form soluble calcium and magnesium salts with hard water.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true, but R is not the correct explanation of A

C

A is true, but R is false

D

A is false, but R is true

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