Reation with Metals

Q.

Whats the balanced equation for magnesium and hydrochloric acid?

Q.

Write the balanced chemical equation for the following reaction:

Action of Hydrochloric acid on Sodium bicarbonate.

Q.

Dilute hydrochloric acid is added in turn to a mixture of iron and sulphur and to the compound formed between iron and sulphur. Name the gas formed in each case.

Q.

Which gas is released when iron reacts with conc nitric acid?

1. Nitrous oxide

2. Nitric oxide

3. Nitrogen dioxide

4. None of the above

Q.

Give a balanced chemical equation for the action of sulphuric acid on sulphur.

Q.

Write the balanced chemical equation for the following:

dilute Sulphuric acid is poured over Sodium sulphite.

Q.

Name the following:
A metal which liberates nitric oxide and nitrogen dioxide with nitric acid under different conditions.

Q.

What happens when copper comes in contact with dilute HCl in the absence of air?

1. No action on copper will take place.

2. Copper dissolves in dil. HCl.

3. Copper chloride will be formed.

4. Copper sulphate will be formed.

Q. What do you see when concentrated nitric acid is added to copper?

Q.

X, Y and Z are three crystalline solids which are soluble in water and have a common anion.

To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).

(a) A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.

INFERENCE 1 : The common anion is the .................. ion.

(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.

INFERENCE 2 : The cation in X is either ................ or ....................

(c) The action of heat on Y produces a reddish-brown gas and a yellow residue which fuses with the glass of the test tube.

INFERENCE 3 : The metal ion present in Y is the .................... ion.

(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.

INFERENCE 4 : Z contans the ............ cation.

(e) Write the equations for the following reactions:

(1) X and concentrated sulphuric acid (below ${200}^{\circ }$). (One equation only for either of the cations given in INFERENCE 2).

(2) Action of heat on Y.

(3) Concentrated nitric acid is added to copper turnings kept in a beaker.

Q.

Give the balanced chemical equations to prepare the following salts

(i) Lead sulphate from Lead carbonate

(ii) Sodium sulphate using dilute Sulphuric acid

(iii) Copper chloride using Copper carbonate

Q. How will you account for the acidic nature of $HN{O}_3$? Justify your answer by giving three different types of reactions with balanced chemical equations. [5 MARKS]

Q. Identify the following : [5 MARKS]
(a) black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases which when mixed produce a white solid.
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved

Q.

A salt can be prepared in the laboratory by reacting:

1. metal and dilute sulphuric acid

2. metal and dilute hydrochloric acid

3. metal carbonate and dilute hydrochloric acid

4. All options are correct

Q.

Which of the following gas is released when copper reacts with dil. nitric acid?

1. NO₂

2. N₂O₅

3. N₂

4. NO

Q.

Which of the following gas is formed when copper reacts with cold and dilute nitric acid?

1. N₂O

2. N₂O₅

3. NO₂

4. NO

Q.

Write the balanced equation for the action of heat on a mixture of copper and concentrated nitric acid.

Q.

Which of the following reactions shows the acidic character of nitric acid?

1. $C+4HN{O}_3\to C{O}_2+2H_{2}O+4N{O}_2$

2. $K_{2}O+2HN{O}_3\to 2KN{O}_3+H_{2}O$

3. $S+6HN{O}_3\to H_{2}S{O}_4+2H_{2}O+6N{O}_2$

4. $ZnO+2HN{O}_3\to Zn(N{O}_3{)}_2+H_{2}O$

Q. Complete the given reaction.
$KN{O}_3\left(s\right)\underset{}{\overset{\Delta }{\to }}KN{O}_2\left(s\right)+$$\left(g\right)$

1. $O_2$
2. $NO$
3. $N{O}_2$
4. $\left[O\right]$

Q.

What is/are the produts formed when manganese is treated with 1% nitric acid?

1. $H_2$

2. $Mn(N{O}_3{)}_2$

3. $N{O}_2$

4. $H_{2}O$

Q.

Concentrated hydrochloric acid is added to manganese oxide to give metal chloride X, water and gas Y. Gas Y is greenish yellow having a sharp pungent choking odour. So, Y is:

1. H₂

2. O₂

3. CO₂

4. Cl₂

Q. Match the given metal salt, non-metal and metal with the gases evolved, when they react with $dil.HN{O}_3$

1. $S{O}_2$
2. $N{O}_2$
3. $NO$

Q. What are the products formed when $L{i}_{2}C{O}_3$ undergoes decomposition?

1. $L{i}_{2}C{O}_3+$ $CO$
2. $L{i}_{2}O+CO$
3. $L{i}_{2}O+C{O}_2$
4. $Li{O}_2+CO$

Q.

Which of the following reactions shows nitric acid as an oxidizing agent?

1. $C+4HN{O}_3\to C{O}_2+2H_{2}O+4N{O}_2$

2. $K_{2}O+2HN{O}_3\to 2KN{O}_3+H_{2}O$

3. $S+6HN{O}_3\to H_{2}S{O}_4+2H_{2}O+6N{O}_2$

4. $3Zn+8HN{O}_3\to 3Zn(N{O}_3{)}_2+4H_{2}O+2NO$

Q. Complete the given reaction.

$Hg{\left(N{O}_3\right)}_2\underset{}{\overset{\Delta }{\to }}N{O}_2+O_2+$.

1. $Hg$
2. $HgO$
3. $H{g}_3{N}_2$

Q.

When cupric oxide reacts with dilute nitric acid, it forms

1. Cuprous oxide

2. Copper nitrite

3. Copper nitrate

4. Copper nitride

Q. $N{H}_3+O_2\to \underset{\Delta }{\overset{Pt}{\to }}A+H_{2}O$ ; $A+O_2\to B$; $B+O_2+H_{2}O\to C$

1. $N_{2}O$, $N{O}_2$ and $HN{O}_3$
2. $N_{2}O$, NO and $HN{O}_3$
3. N O, $N{O}_2$ and $HN{O}_3$
4. $N{O}_2$, NO and $HN{O}_3$

Q.

249. Treating alkalis with acidic oxides:

(a) $\mathrm{NaOH}+{\mathrm{CO}}_2\to$

Q.

Which of the following gas is formed when copper reacts with a hot dilute nitric acid?

1. N₂O

2. N₂O₅

3. NO₂

4. NO

Q. Identify the compounds/elements which release $N{O}_2$, on reacting with concentrated nitric acid.

1. $Zn$
2. $Fe$
3. $P$
4. $C$
5. $Cu$
6. $Zn(OH{)}_2$
7. $K_{2}O$
8. $Ca(S{O}_3{)}_2$