Slaked lime is __________

Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ?

A

A - O₂; B - CaCO₃

B

A - CO₂; B - Ca(OH)₂

C

A - O₂; Ca(OH)₂

D

A - CO₂; B - CaCO₃

Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar.Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars.Select your answer according to the codes given below:

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 the correct explanation of A

C

A is true but R is false

D

A is false but R is true

Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar.
Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars.
Select your answer according to the codes given below:

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 the correct explanation of A

C

A is true but R is false

D

A is false but R is true

Study the following statements.
(i) Hydraulic lime is suitable for white washing,
(ii) Fat lime is suitable for whitewashing,
(iii) Hydraulic lime is suitable for making mortar,
(iv) Fat lime is suitable for making mortar.

A

(i) and (iv)

B

(ii) and (iii)

C

(i) and (ii)

D

(iii) and (iv)

This compound is conventionally used for the whitewashing of buildings. Which of the following statements is/are true about it. 1. It is obtained by treating quick lime with water. 2. It is produced when calcium carbide reacts with water. 3. It is one of the raw materials used for the manufacture of Portland cement. 4. It is called slaked lime and its chemical formula is Ca(OH)2. Select the correct answer using the code given below:

A

1 and 4 only

B

2, 3 and 4 only

C

1, 2 and 4 only

D

1, 2 and 3 only

Quick lime reacts with water to give slaked lime and heat. What type of reaction is this?

A

Combination

B

Double displacement

C

Redox

D

Displacement

Which of the following is incorrect about the formation of slaked lime from quick lime?

A

The process absorbs energy

B

The slaked lime forms dissolves in water

C

The process is an example of Combination reaction

D

The slaked lime further mixes with the Carbon di Oxide in air to give white finish

__________ of quicklime produces slaked lime.

A

Hydration

B

Dehydration

C

Hydrogenation

D

None of these

Three bags whose volumes are in the ratio of 3 : 5 : 7 are full of lime and silica. In the 1st bag the ratio of lime and silica is 5 : 1, in 2nd bag the ratio is 7 : 3 and in the 3rd bag the ratio is 3 : 4. All the three mixtures are mixed in another bag. Find the ratio of lime and silica in the final mixture.

A

4 : 3

B

3 : 2

C

3 : 4

D

2 : 3

E

2 : 1

In the question, two statements are given followed by two conclusions, I and II. You have to consider the statements to be true even if they seem to be at variance with commonly known facts. You have to decide which of the given conclusions, if any, follow(s) from the given statements. Statements: 1. Some lemons are yellow. 2. All yellow are lime. Conclusions: I. No lime are lemon. II. Some lemon are lime.

A

Only conclusion I follows

B

Neither conclusion I nor II follows

C

Only conclusion II follows

D

Both conclusions I and II follow.

Slaked lime is __________

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