Reaction of Acids with Metals

Q.

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

Q.

What happens when zinc metal is added to acetic acid?

Q.

Hydrogen gas is not evolved when metals react with:

1. Water

2. Nitric acid

3. Dilute hydrochloric acid

4. Both water and nitric acid

Q. Question 4
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute ${\text{H}}_2{\text{SO}}_4$.

Q.

Dilute hydrochloric acid $\text{(HCl)}$ reacts with metals to evolve _____ gas along with the formation of corresponding metal salt.

1. hydrogen
2. nitrogen
3. chlorine
4. oxygen

Q. Question 7
Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals, except $\text{Mn}$ and $\text{Mg}$?

(a) ${\text{H}}_2{\text{SO}}_4$
(b) $\text{HCl}$
(c) ${\text{HNO}}_3$
(d) All of these

Q.

Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels)?

Q.

Define each of the following with one example:

(b) Dibasic acids.

Q.

A road tanker carrying an acid was involved in an accident and its contents spilled on the road. At the side of the road, iron drain covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river.
(a) Explain how the specialist could carry out a simple test to see if the river water contains some acid or not.
(b) Explain why drain covers began fizzing as the acid rain over them.

Q.

Why are we using dilute acids for reaction? Why can't we use concentrated acids for reaction?

Q. Question 1
Why should curd and sour substances not be kept in brass and copper vessels?

Q.

What is aqua regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.

Q.

Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain :

(a) Sodium sulphate, (b) Copper sulphate,

(c) Iron (II) sulphate, (d) Zinc carbonate,

$\begin{array}{ccc}\text{Dilute sulphric acid}& Copper& Coppercarbonate\\ & \text{Iron}& SodiumCarbonate\\ & \text{Sodium}& \\ & \text{Zinc}& \end{array}$

Q. All of the following metals react with dilute acids to form salt and hydrogen gas except

1. Mg
2. Fe
3. Zn
4. Cu

Q. What is the product obtained when an acid reacts with a metal?

1. Salt + Water
2. Salt + Carbon Dioxide + Water
3. Salt + Hydrogen
4. Salt + Chlorine gas

Q.

Acids do not react with metals except with Zn, Al and Sn.

1. True

2. False

Q.

Choose the correct option:

1. Metals displace hydrogen gas from the acid.

2. Salt is formed during the reaction between acid and metal.

3. Metals do not displace hydrogen gas from the base.

4. A metal reacts with an acid to form a salt and releases hydrogen gas.

Q.

Question 40
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with ${\text{HNO}}_3$, hydrogen is not liberated. Why?

Q.

Question 5(d)
Write word equations and then balanced equations for the reaction taking place when:
(d) Dilute hydrochloric acid reacts with iron filings

Q. How will you prepare Aqua regia from nitric acid?

Q.

Write word equations and then balanced equations for the reaction taking place when

Dilute hydrochloric acid reacts with iron filings.

Q.

Choose the correct answer from the options given below:
Aqua regia is a mixture of:
(a) dilute hydrochloric acid and concentrated nitric acid
(b) Concentrated hydrochloric acid and dilute nitric acid
(c) Concentrated hydrochloric acid [1 part] and concentrated nitric acid [3 parts]
(d) Concentrated hydrochloric acid [3 parts] and concentrated nitric acid [1 part]

Q. A solution reacts with zinc granules to give a gas which burns with a 'pop' sound. The solution contains:

1. $N{a}_{2}C{O}_3$
2. $HCl$
3. $NaCl$
4. $Mg(OH{)}_2$

Q. What is the odour of ammonia gas?

1. Odourless
2. Pungent
3. Medicinal
4. Fragrant

Q.

SO₂ when passed through water forms a solution of_______

Q.

Complete the word equation given below:

Metal + dilute acids $\to$salt + ________

1. Water

2. Hydrogen gas

3. Carbon dioxide

4. Carbon monoxide

Q.

Write equation for dilute Sulfuric acid producing hydrogen.

Q.

Acids do not react with metals except with Zn, Al and Sn.

1. True

2. False

Q. In recent times, the white color of Taj Mahal in Agra is changing to ______ due to ______.

1. Black, emission from vehicles
2. Yellow, deposition of salts
3. Brown, deposition of iron oxides
4. Blue, acid rain

Q.

Write the chemical equation for the following activities:

NaOH solution was added to HCl solution.