Reaction of Metals with Acid

Q.

What happens when dilute sulfuric acid is poured on zinc granules?

Q. Hydrogen gas is produced when a metal reacts with an acid.

1. False
2. True

Q. What is the aqua regia?

Q.

The reaction of granulated Zinc with dilute $\mathrm{HCl}$ results in the formation of___________

Q.

When nitric acid $HN{O}_3$ reacts with metals, hydrogen gas is not observed because

1. Metallic hydrides are formed.

2. Hydrogen is oxidised by nitric acid.

3. Metal weakly react with nitric acid.

4. Hydrogen is reduced by nitric acid.

Q.

Which of the following is used as a foaming agent in extinguishers?

1. Ammonium hydroxide

2. Magnesium hydroxide

3. Aluminum hydroxide

4. Potassium hydroxide

Q.

What is Pig Iron. How is it made? [3 MARKS]

Q. Assertion : Aluminum oxide react with acids as well as bases to produce salt and water
Reason : Aluminum oxide is amphoteric in nature.

1. Only assertion is true
2. Only reason is true
3. Both assertion and reason are true
4. Both assertion and reason are false

Q. Dilute hydrochloric acid reacts with zinc to evolve _____ gas along with the formation of zinc chloride salt.

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

Q. Question 3 (d)
Metals react with acids to produce ___ gas.

Q. Aqua regia is a mixture of three parts of hydrochloric acid and one part of acid.

1. nitric
2. sulphuric
3. acetic
4. citric

Q.

Zinc (Zn), Iron (Fe), Aluminium (Al) and Magnesium (Mg) reacts with the dilute hydrochloric acid in different test tubes. Which of the below-mentioned order of metals correctly explains the order of vigour nature of reactions.

1. Magnesium (Mg) > Zinc (Zn) > Iron (Fe) > Aluminium (Al)

2. Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe)

3. Magnesium (Mg) < Aluminium (Al) < Zinc (Zn) < Iron (Fe)

4. Zinc (Zn) > Aluminium (Al) > Magnesium (Mg) > Iron (Fe)

Q.

How do metals react with dilute acids ? Explain with the help of an example.

Q.

The metal X reacts with dilute hydrochloric acid to form a gas Y.The metal X also reacts with sodium hydroxide solution (on heating) to form the same gas Y.When a lighted matchstick is applied, this gas burns by producing a 'pop' sound.

(a) Name two metals which could behave like X.

(b) Name the gas Y.

Q.

One day Rita went to a jwellershop with mother. Her mother gave an old gold to Goldsmith to polish. Next day when they bought the jwellershop back, they found that there is a slight lose in its weight. Can you suggest a reason for the loss in wieght?

Q. Which of the following elements will not liberate hydrogen gas with acids?

1. Zinc
2. Sulphur
3. Phosphorus
4. Aluminium

Q. How does phosphorus react with water?

Q.

When magnesium is burned with hydrochloric acid, a pop sound is heard when a glowing splint is brought near the beaker. It is because:

1. Hydrogen sulphide is released.

2. Hydrogen gas is released.

3. Magnesium oxide is decomposed.

4. Chlorine gas is released.

Q. What is aqua regia? State the uses of aqua regia.

Q.

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? [2 MARKS]

Q. When metal Z is added to dilute HCl solution, there is no evolution of gas. Metal 'Z' is:

1. potassium
2. sodium
3. silver
4. zinc

Q.

The metal that is not corroded by air, water and acid is-

1. copper
2. zinc
3. aluminium
4. gold

Q. Which gas burns with a pop sound?

1. Carbon dioxide
2. Nitrogen dioxide
3. Hydrogen sulphide
4. Hydrogen

Q.

(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas.

(b)Name one metal which does not react with dilute hydrochloric acid.

Q. When zinc metal reacts with dilute sulphuric acid, a gas is evolved. Which one is a correct statement about the nature of this gas ?
(1) colourless with suffocating odour
(2) reddish brown and odourless
(3) colourless and sweet smelling
(4) colourless and odourless

Q.

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

Q.

The metal which will not produce hydrogen gas on reacting with dilute sulphuric acid is :

(a) sodium

(b) silver

(c) iron

(d) zinc

Q.

Which of the following acids is known as aqua fortis?

1. Free state only

2. Combined state only

3. Both in free and combined state

4. None of these

Q.

Describe the reaction of carbonic acid with metals.

Q. Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Which of the following represents the correct composition of Aqua-regia?

1. $1HN{O}_3+3HCl$
2. $1HCl+3HN{O}_3$
3. $1HCl+1HN{O}_3$
4. $1HN{O}_3+2HCl$