Tests for Hydrochloric Acid

Q.

Aqueous Solution of ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ on reaction with ${\mathrm{Cl}}_2$ gives:

1. $\mathrm{NaCl}$

2. ${\mathrm{NaHSO}}_4$

3. $\mathrm{NaOH}$

4. None of these

Q.

Give your observation along with equations :

When sulphuric acid is added to barium chloride.

Q.

Litmus, phenolphthalein and methyl orange are the common acid-base indicators. Basically these are organic dyes with characteristic colours. Litmus is the extract of the plant lichen. Phenolphthalein and methyl orange are synthesised in the laboratory. An indicator imparts a specific colour to an acidic solution and its colour changes. when the solution becomes basic or alkaline. The same applies to the basic solution as well. Will there be a color change if dilute HCl solution is slowly added to the solution of ${\mathrm{Na}}_2{\mathrm{CO}}_3$ and few drops of methyl orange?

Q.

When the mixture of manganese dioxide and concentrated hydrochloric acid is subjected to heat

1. hydrogen gas is liberated

2. oxygen gas is liberated

3. no reaction takes place.

4. chlorine gas is liberated.

Q. Carbon dioxide gas is liberated when HCl acid is added to:

1. Silver Chloride.
2. Lead Nitrate.
3. Calcium Carbonate.
4. Sodium Nitrate.

Q. Which observation in silver nitrate test of HCl helps us to confirm the presence of chlorine in HCl?

1. Formation of hydrogen gas
2. Formation of nitrogen gas
3. Formation of black precipitate
4. Formation of white precipitate

Q.

Carbon dioxide gas is liberated when HCl acid is added to

1. calcium carbonate

2. sodium nitrate

3. ammonia

4. sodium sulphate

Q.

Name an indicator that is red in acidic solution and becomes blue when some base is added to it.

Q.

What happens when HCl is treated with an aqueous solution of $AgN{O}_3$?

1. White fumes are produced.

2. A yellow precipitate is formed.

3. A curdy white precipitate is formed.

4. No visible reaction occurs.

Q. Which of the following observations regarding Manganese Dioxide test is correct?

1. Evolution of a green gas
2. Biproducts are chlorine and water
3. The salt obtained is $MgC{l}_2$
4. Biproducts are chlorine and hydrogen

Q.

Hydrochloric acid is added to a glass container containing water and blue litmus solution. The colour of the blue litmus solutions turns into

1. Red

2. Yellow

3. No change

4. Purple

Q.

An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What are (A) to (C) and give the chemical reactions.

1. 

2. 

3. 

4. 

Q.

What happens when HCl is treated with an aqueous solution of $AgN{O}_3$?

Q.

What happens when HCl is treated with an aqueous solution of AgNO₃?

1. A yellow precipitate is formed.

2. A white precipitate is formed.

3. No visible reaction.

4. Gives white fumes.

Q. In flame test:
$C{a}^{2+}$ gives brick red flame.

1. True
2. False

Q.

Name two coloured gases.

Q.

Give one word for the following.

A carbonate which don’t decompose on heating.

Q. Choose the nonmetallic oxides from the following:

1. $\text{FeO}$
   
2. ${\text{Al}}_2{\text{O}}_3$
   
3. ${\text{Fe}}_2{\text{O}}_3$
   
4. ${\text{CO}}_2$
   

Q.

Which colour precipitate is obtained when the silver nitrate solution is added to dilute hydrochloric acid?

1. Curdy yellow precipitate

2. Greenish yellow precipitate

3. Curdy white precipitate

4. Purple colour precipitate