Different Physical Properties of HCl

Q.

Explain why :

(a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor.
(b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air.
(c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene :
(i) has no effect on litmus, and
(ii) does not conduct electricity.
(d) thick white fumes are formed when a glass rod dipped in $N{H}_{4}OH$ is brought near the mouth of a bottle full of HCl gas.
(e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.

(f) hydrogen chloride gas is not collected over water.

Q. Write the main difference between hydrogen chloride gas and hydrochloric acid. [3 MARKS]

Q.

Hydrogen chloride gas fumes in moist air but hydrogen sulphide gas does not. Give reasons.

Q.

The diagram shows an apparatus for the laboratory preparation of hydrogen chloride.
(i) Identify A and B.
(ii) Write the equation for the reaction.
(iii) How would you check whether or not the gas jar is filled with hydrogen chloride?
(iv) What does the method of collection tell you about the density of hydrogen chloride?

Q.

Name the gas which has the smell of burning sulphur.

Q.

State the odour of HCl gas.

1. Pungent, choking smell

2. Sweet smell

3. Burnt smell

4. Rotten egg smell

Q. Hydrogen chloride gas is collected by the ___ displacement of air.

1. fractional
2. sideways
3. upward
4. downward

Q.

Name a gas which turns:
Lime water milky and acidified $K_{2}C{r}_2{O}_7$paper turns green.

Q.

100% pure sulphuric acid is a strong acid

Q.

CO₂ gas turns blue litmus paper:

1. Blue

2. Green

3. Red

4. Colourless

Q. Explain why? [5 MARKS]
(a) Anhydrous HCl is a poor conductor while aq. HCl is an excellent conductor of electricity.
(b) Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.
(c) When the stopper of a bottle full of hydrogen chloride gas is opened, there are fumes in the air.

Q.

What happens when hydrogen chloride reacts with atmospheric water vapour?

1. White fumes are formed.

2. Green fumes are formed.

3. The gas formed is colourless.

4. Red fumes are formed.

Q.

Name the gas evolved in following case:
The gas produced by the action of concentrated sulphuric acid on sodium chloride.

Q.

Name a gas which turns:
Acidified potassium dichromate solution green

Q.

Write the two physical properties of carbon dioxide.

Q.

Write the equation for:
(a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(b) the reaction between hydrogen chloride and ammonia.

Q.

Air is dense at sea level.This is an application of ___ law.

Q.

Hydrogen chloride gas fumes in moist air but hydrogen sulphide gas does not.

Q. Write the following properties of ethene:
(a) Physical state

Q. Paragraph for below question
नीचे दिए गए प्रश्न के लिए अनुच्छेद

A dilute solution contains ‘Y’ moles of solute A with 1000 gm of a solvent, the molal elevation constant of solvent is K_b. The solute is tetramerise in the solution according to the following equation and its degree of association is β.


एक तनु विलयन में 1000 gm विलायक के साथ ‘Y’ मोल विलेय A है, विलायक का मोलल उन्नयन स्थिरांक K_b है। निम्नलिखित समीकरण के अनुसार विलयन में विलेय चतुष्टयीकृत हो जाता है तथा इसके संगुणन की मात्रा β है।


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Q. The degree of association (β) is equal to, if ΔT_b is the elevation in boiling point.

प्रश्न - यदि ΔT_b क्वथनांक उन्नयन है, तो संगुणन की मात्रा (β) होगी

1. $\frac{4}{3}\left(\frac{K_{b}Y-\Delta T_b}{K_{b}Y}\right)$
2. $\left(\frac{K_{b}Y-\Delta T_b}{K_{b}Y}\right)$
3. $\frac{2}{3}\left(\frac{K_{b}Y-\Delta T_b}{K_{b}Y}\right)$
4. $\frac{9}{4}\left(\frac{K_{b}Y-\Delta T_b}{K_{b}Y}\right)$

Q.

Give an example of mixture of gas-gas

Q. Assertion :Dilute HCl cannot be concentrated beyond a certain concentration by boiling. Reason: HCl boiling and melting point depend on the concentration or molarity of HCl in aqueous solution. They range from a very low conc of 0% HCl to values for fuming HCl at over 40% HCl.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

I am saloni i have a doubt in chemistry. for example ammonium formula NH4+ here +1 is valancy but what is 4 here mean .

Q.

What Weight Can Hydrogen Lift?

Q. Observing the method of collection of the gas, what you can tell about the density of hydrogen chloride?

1. A gas that is more dense than air
2. A gas that is less dense than air
3. A gas (liqued form ) that is less dense than air
4. None of these

Q. Name two gases which can be used in the study of the fountain experiment.

1. Ammonium chloride and hydrogen chloride gas
2. Ammonia gas and hydrogen chloride gas
3. Ammonia gas and chlorine gas
4. Ammonia gas and hydrogen gas

Q. $HCl$ gas cannot be dried by passing through:

1. $H_{2}S{O}_4$
2. $CaO$
3. $P_2{O}_5$
4. $CO$

Q. Assertion :$HCl$ is collected by upward displacement of air. Reason: $HCl$ gas is lighter than air.

1. If both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2. If both Assertion and Reason are correct, but Reason is not the correct explanation of the Assertion.
3. If Assertion is correct, but Reason incorrect
4. If Assertion is incorrect , but Reason is correct .

Q.

Write the physical properties of hydrogen.

Q. The bulb in the given set-up glows only when X is added to it.

Identify X from the following:
*More than one option may be correct.

1. KOH(aq)
2. $C_6{H}_{12}{O}_6\left(s\right)$
3. $C_2{H}_5\mathrm{OH}\left(l\right)$
4. ${\mathrm{CaCl}}_2\left(\mathrm{aq}\right)$