Preparations and Uses of Sodium Bicarbonate and Common Salt

Q.

Define F- centre?

Q. What happens when baking soda is mixed with water which reaction takes place and which gas is released and why bubbles are formed

Q.

[P] on treatment with ${\mathrm{Br}}_2$ / ${\mathrm{FeBr}}_3$ in ${\mathrm{CCl}}_4$ produced a single isomer ${\mathrm{C}}_8{\mathrm{H}}_7{\mathrm{O}}_2\mathrm{Br}$ while heating [P] with soda lime gave toluene. The compound [P] is:

1. 

2. 

3. 

4. 

Q.

When boron is fused with NaOH, products formed are

1. Na₂B₄O₇ and H₂

2. NaBO₂ and H₂

3. Na₃BO₃ and H₂

4. B₂O₃ and H₂

Q.

What are the elements present in the following compound?

Baking soda

Q. To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green when the colourless gas is passed through it. The sodium salt is

1. $N{a}_{2}S{O}_3$
2. $N{a}_2{S}_2{O}_3$
3. $N{a}_{2}S$
4. $N{a}_2{S}_4{O}_6$

Q. A $10mg$ effervescent tablet containing sodium bicarbonate and oxalic acid releases $0.25ml$ of $C{O}_2$ at $T=298.15K$ and $p=1$ bar. If molar volume of $C{O}_2$ is $25.0L$ under such condition, what is the percentage of sodium bicarbonate in each tablet?
$[\text{Molar mass of}NaHC{O}_3=84gmo{l}^{-1}]$

1. $16.8$
2. $0.84$
3. $33.6$
4. $8.4$

Q.

The gas released on mixing baking soda with vinegar.

Q.

Washing Soda is the common name for?

1. Calcium carbonate

2. Magnesium carbonate

3. Sodium carbonate

4. Potassium carbonate

Q.

A hydrated salt which loses its water of crystallization on exposure to air is known as _____ salt.

1. Efflorescent

2. Deliquescent

3. Hygroscopic

Q. The addition of $N{a}_{2}C{O}_3$, to the aqueous solution of an oxide produces $C{O}_2$. This reaction indicates that

1. Oxide is basic
2. Oxide is neutral
3. Oxide is that of a metal
4. Oxide is that of a non-metal

Q. A sodium salt on treatment with $MgC{l}_2$ gives white precipitate only one heating. The anion of the sodium salt is

1. $HC{O}_3^{-}$
2. $C{O}_3^{2-}$
3. $N{O}_3^{-}$
4. $S{O}_4^{2-}$

Q.

Write the chemical formula for washing soda? How may it be obtained from baking soda? Name an industrial use of washing soda other than washing clothes.

Q.

Which of the following salts does not contain water of crystallisation?

1. Blue vitriol

2. Baking soda

3. Washing soda

4. Gypsum

Q.

What does ionized mean?

Q. The treatment of sodium phenoxide with $C{O}_2$ at 400 K and 4 - 7 atmosphere pressure followed by acidification of the reaction product gives

1. Salicyladehyde
2. Salicylic acid
3. Cumene
4. Benzaldehyde

Q.

An aqueous solution of a substance gives a white precipitate on treatment with dil HCl, which dissolved on heating. On passing $H_{2}S$ in hot acidic solution a black precipitate is formed. The substance is:

1. Hg₂²⁺ salt

2. Cu²⁺ salt

3. Pb²⁺ salt

4. Ag⁺ salt

Q. Which of the following compounds turns white on treatment with $H_2{O}_2$?

1. 
2. 
3. 
4. 

Q. Phosphine is generally prepared in the laboratory by:

1. Heating phosphorous in a current of hydrogen
2. Heating white phosphorous with aqueous solution of caustic soda
3. Decomposition of $P_2{H}_4$ at ${110}^{\circ }C$
4. Heating red phosphorous with an aqueous solution of caustic soda

Q.

A substance A is heated with slaked lime and a gas B with a pungent smell is obtained. Name substances A and B, and give the balanced equation.

Q. Which of the following salts does not contain water of crystallisation ?

1. Blue viltriol
2. Baking soda
3. Washing soda
4. Gypsum

Q.

The formula of bleaching powder is_________.

Q. Which of the following objects are soluble in water?

1. Table salt
2. Fodder
3. Clay
4. Chalk powder

Q.

Sodium hydroxide will conduct electricity only in fused or aqueous solution Why?

Q. NaCl can be used in preparation of which of the following compounds?

1. $N{a}_2{O}_2$
2. $N{a}_{2}S{O}_4$
3. $NaOH$
4. $N{a}_{2}C{O}_3$

Q.

Why does effervescence take place when a soft drink bottle is opened at room temperature?

Q. Why is tartaric acid added into baking soda to get baking powder?

Q. Why baking powder is used to prepare cake?

Q. Read the given statements and select the correct option:

1. Both statements 1 and 2 are true statement 2 is correct explanation of statement 1.
2. Statements 1 is true and statement 2 is false
3. Both statements 1 and 2 are false.
4. Both statements 1 and 2 are true both statement 2 is not the correct explanation of statement 1.

Q. Give four uses of sodium carbonate (washing soda).