Preparation from Manganese Dioxide

Q.

Which of the following represents the saponification reaction?

1. ${\mathrm{CH}}_3\mathrm{COONa}+\mathrm{NaOH}\to {\mathrm{CH}}_4+{\mathrm{Na}}_2{\mathrm{CO}}_3$

2. ${\mathrm{CH}}_3\mathrm{COOH}+{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\to {\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5+{\mathrm{H}}_2$

3. $2{\mathrm{CH}}_3\mathrm{COOH}+2\mathrm{Na}\to 2{\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{H}}_2$

4. ${\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5+\mathrm{NaOH}\to {\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

Q. Which of the following produces hydrolith with dihydrogen?

1. $Al$
2. $Cu$
3. $Ca$
4. $Mg$

Q. What is the use of thistle funnel in the preparation of chlorine gas?

1. To add water
2. For the discharge of chlorine gas
3. To add manganese dioxide
4. To add hydrochloric acid

Q. In the preparation of chlorine gas from manganese dioxide, concentrated sulphuric acid is added to __________ .

1. remove moisture from the gas
2. increase the moisture in the gas
3. to observe the colour change
4. heat the manganese dioxide

Q.

Name the process in which a part of the glass is reacted with hydrogen fluoride or hydrofluoric acid to make decorative glass articles.

1. Finishing

2. Annealing

3. Etching

4. Shaping

Q. Identify the compound $X$ in the following reaction?

$Mn{O}_2+4HCl\underrightarrow{heat}X+C{l}_2+2H_{2}O$

1. $Mn(OH{)}_2$
2. $MnCl$
3. $MnC{l}_2$
4. $M{n}_{2}C{l}_2$

Q. What happens when a glass rod soaked in ammonia is brought in contact with HCl vapours?

1. None of the above
2. Red fumes are formed
3. White fumes are formed
4. Green fumes are formed

Q. the volume of carbon dioxide gas evolved at STP by heating 7.3 grams Mg(HCO3)2will be = ?

Q.

______________ obtained HCl in its purest form.

1. Lavoisier

2. Joseph Priestly

3. John J Priestly

4. Shelburne

Q. The compounds used in the preparation of chlorine are manganese dioxide and .

1. sulphuric acid
2. hydrochloric acid
3. nitric acid

Q. State the odour of HCl gas.

1. Pungent, choking smell
2. Sweet smell
3. Burnt smell
4. Rotten egg smell

Q. Manganese dioxide on reaction with concentrated HCl releases chlorine in the form of ______.

1. solid
2. liquid
3. both solid and gas
4. gas