Uses of Slaked Lime

Q. What is chemical formula of slaked lime ?

1. $Ca(OH{)}_2$
2. $CaO$
3. $CaO+C{O}_2$
4. $CaC{O}_3$

Q.

Suspension of slaked lime in water is known as
(a) lime water (b) quick lime (c) milk of lime (d) Aqueous solution of slaked lime

Q. 0.1 M aqueous solution of K4 [Fe(CN)6] will have the same freezing point as 0.1 M aqueous solution of 1) Fe(SO4)3 2) Al2 (SO4)3 3) AlCl3 4) K3PO4

Q.

Name the substance that on treatment with Chlorine yields bleaching powder.

Q.

Which gas turns lime water milky?

Q.

A, B, and C are three isomers (molecular formula ${\mathrm{C}}_8{\mathrm{H}}_{11}\mathrm{N}$) that gave the following result.

A and C$\stackrel{\mathrm{diazotisation}}{\to }$P+Q$\underset{\left(\mathrm{ii}\right)\mathrm{Oxidation}\left({\mathrm{KMnO}}_4+{\mathrm{H}}^{+}\right)}{\overset{\left(\mathrm{i}\right)\mathrm{Hydrolysis}}{\to }}$R(Product of A)+S (Product of C)

R has a lower boiling point than S, B$\stackrel{{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{SO}}_2\mathrm{Cl}}{\to }$a alkali-insoluble product

What are A, B, and C?

1. 

2. 

3. 

4. 

Q.

Write the chemical name of the following compound.

(f) ${\mathrm{CuCO}}_3$

Q. If excess of $Ca(OH{)}_2$ is added to hard water in clark’s method.

1. Permanent hardness is removed
2. Temporary hardness is not removed
3. Temporary hardness occurs
4. Permanent hardness occurs

Q. The reagent used to determine hardness of water titrimetrically is

1. Oxalic acid
2. EDTA
3. Sodium citrate
4. Sodium thiosulphate

Q.

Write the balanced chemical equation for the reaction of zinc oxide with hydrogen.

Q.

Which is more soluble in water $\mathrm{NaCl}\mathrm{or}\mathrm{KCl}$?

Q. Which of the following statements is correct?

1. Single phase is obtained in immiscible solution.
2. In partially miscible solution, single phase will be attained at a set of composition.
3. Single phase will be attained at a set of composition for ink in water solution.
4. Water in 1-Butanol is a completely miscible solution.

Q.

When Chlorine $\left({\mathrm{Cl}}_2\right)$ gas combines with cold, dilute aqueous Sodium hydroxide $\mathrm{NaOH}$, the products are

1. ${\mathrm{Cl}}^{-}\mathrm{and}{\mathrm{ClO}}^{-}$

2. ${\mathrm{Cl}}^{-}\mathrm{and}{{\mathrm{ClO}}_2}^{-}$

3. ${\mathrm{ClO}}^{-}\mathrm{and}{{\mathrm{ClO}}_3}^{-}$

4. ${{\mathrm{ClO}}_2}^{-}\mathrm{and}{\mathrm{ClO}}_3$

Q. Products obtained by the reaction of $Ca{C}_2$ and $A{l}_4{C}_3$ with heavy water respectively are:

1. $C{D}_4\text{and}{C}_2{D}_6$
2. $C_3{D}_4\text{and}{C}_2{D}_2$
3. $C_2{D}_2\text{and}C{D}_4$
4. $C_2{D}_6\text{and}C{D}_4$

Q. How can slaked lime be prepared from quick lime?

1. By adding water to quick lime
2. By adding water to calcium chloride
3. By heating quick lime
4. By adding water to Calcium carbonate

Q. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas (A) and an alkaline solution. The solution on exposure to air produces a thin solid layer of (B) on the surface. When $C{O}_2$ gas passed into the alkaline solution, then which of the following product will be formed?

1. $C{a}_3{N}_2$
2. $CaC{O}_3$
3. $CaS{O}_4$
4. None of these

Q.

Calcium imide on hydrolysis gives gas (P) which on oxidation by bleaching powder gives gas (Q), gas (Q) on reaction with magnesium gives compound (R) which on hydrolysis again gives gas (P). Identity (P), (Q), and (R)

1. ${\mathrm{N}}_2,{\mathrm{N}}_2{\mathrm{O}}_5,\mathrm{Mg}\left({\mathrm{NO}}_3\right)$

2. ${\mathrm{N}}_2,{\mathrm{NH}}_3,{\mathrm{MgNH}}_4$

3. ${\mathrm{NH}}_3,{\mathrm{NO}}_2,\mathrm{Mg}{\left({\mathrm{NO}}_2\right)}_2$

4. ${\mathrm{NH}}_3,{\mathrm{N}}_2,{\mathrm{Mg}}_3{\mathrm{N}}_2$

Q. The product obtained on passing excess carbondioxide through lime water is ___

1. $Ca(HC{O}_3{)}_2$
2. $CaHC{O}_3$
3. $CaC{O}_3$
4. $C{a}_{2}C{O}_3$

Q. The temporary hardness of water due to calcium bicarbonate can be removed by:

1. Adding
2. Filtration
3. Boiling
4. Adding HCl

Q. The reagent (s) used for softening the temporary hardness of water is/are:

1. $N{a}_{2}C{O}_3$
2. $Ca(OH{)}_2$
3. $NaOCl$
4. $C{a}_3(P{O}_4{)}_2$

Q.

Give a balanced equation for the following conversation:

(D). Potassium oxide to a strong alkali

Q.

Bleaching powder is obtained by treating chlorine with ________.

1. ${\text{CaSO}}_4$

2. $\text{CaO}$

3. ${\text{CaCO}}_3$

4. ${\text{Ca(OH)}}_2$

Q.

A gas Y of pungent smell is obtained when a substance X is heated with slaked lime. Name both the substances X and Y . Also give the balanced equation.

Q. 20. What is scum? Whu scum is formed when hard water is treated with soap?

Q. When $C{O}_2$ is passed through lime water, it turns milky due to formation of

1. $CaC{O}_3$
2. $CaO$
3. $Ca(HC{O}_3{)}_2$
4. $C{O}_2$

Q. Which one of the following statement is/are true about slaked lime?

1. Used in preparation of bleaching powder
2. It is a white amorphous powder.
   
3. Used in the preparation of mortar, a building material.
   
4. All of the above.

Q.

Answer in brief.

Why does lime water turn milky when it comes in contact with air?

Q.

Why when lumps of calcium carbonate are added to dilute sulphuric acid, only a few bubbles of gas are seen?

Q. The suspension of slaked lime in water is known as

1. Quick lime

2. Lime water

3. Milk of lime

4. Aqueous solution of slaked lime

Q. What happens when calcium reacts with water?