Reaction of Metals with Acids

Q. Aqua regia is a mixture of hydrochloric acid and nitric acid present in the ratio .

1. 1:3
2. 3:1
3. 1:1
4. 1:2

Q.

what is dilute acid?

Q. Which of the following acids is known as the oil of vitriol?

1. None of these
2. Nitric acid
3. Hydrochloric acid
4. Sulphuric acid

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

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

Q. When zinc reacts with dilute sulphuric acid, a salt is formed with the release of a gas. The gas produced during this puts off a burning candle with a pop sound. The gas evolved during this reaction is:

1. hydrogen sulphide
2. hydrogen
3. oxygen
4. sulphur dioxide

Q. Which acid is known as muriatic acid?

1. Hydrochloric acid
2. Sulphuric acid
3. Nitric acid
4. None of these

Q. Zinc granules are added to a test tube containing dilute hydrochloric acid. A burning splinter is brought near the mouth of the test tube after a while. Which of the following observations are observed?

1. Zinc hydroxide is formed.
2. Zinc chloride is formed.
3. Hydrogen gas is formed.
4. The evolved gas burns with a pop sound.

Q. Magnesium, aluminium or iron on reaction with dilute hydrochloric acid liberates ___ gas.

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

Q. Why on adding Na+ H2O---->(gives) NaOH + H2. Why do we not obtain Na2O + H2 ( oxide of Na)

Q. Difference between the function of concentrated sulphuric acid as a drying agent and as a dehydrating agent

Q.

A hard substance when bent produces a tinkling sound. Predict its nature.

Q. When zinc granules are added to a test tube containing dilute hydrochloric acid then:

1. Oxygen gas is formed
2. Zinc chloride is formed
3. Hydrogen gas is formed
4. The evolved gas burns with a pop sound

Q.

What would you observe on adding dilute hydrochloric acid to
(i) sodium bicarbonate placed in a test tube?
(ii) zinc metal in a test tube? [3 MARKS]

Q.

The metal_____________ can react both with acid as well as alkalis.

Q. The products obtained when a metal oxide reacts with an acid are:

1. salt and water
2. metal hydroxide and hydrogen gas
3. metal hydroxide and water
4. salt and hydrogen gas

Q.

Which of the following are the uses of nitric acid?

1. Nitric acid

2. Sulphuric acid

3. Hydrochloric acid

4. Perchloric acid

Q.

Identify X and Y in the reaction given below.

$\text{Zn(s) + 2HCl(aq)}\to \text{X + Y}$

1. X:- $ZnC{l}_2$, Y:- $HCl$

2. X:- $Zn{H}_2$, Y:- $C{l}_2$

3. X:- $Zn{H}_2$, Y:- $HCl$

4. X:- $ZnC{l}_2$, Y:- $H_2$

Q. A solution of?8%?boric acid is to be diluted by adding a?2%?boric acid solution to it. Then resulting mixture is to be more than?4%?but less than?6%?boric acid. If there are?640?litres of the?8%?solution , how many litres of?2%?solution will have to be added?

Q.

The non-metal having shining surface is-

1. Sulphur

2. Phosphorus

3. Iodine

4. Carbon

Q. Why should not curd be kept in copper containers?

Q. How many parts of hydrochloric acid is present in a mixture of aqua regia?

1. 3

Q. Metals are sonorous.

1. True
2. False

Q. How many parts of hydrochloric acid is present in a mixture of aqua regia?

1. 3

Q. Which of the following are the uses of HCl?

1. It is used in the preparation of aqua regia.
2. It is used in the preparation of chlorine and chloride salts.
3. It is used in the laboratory as a reagent.
4. All of the above

Q. Aditya remembered that Sodium shouldn’t be stored in water and so used ethanol to store sodium. He observed sodium disappearing to give a yellow powder. What is the yellow powder?

1. Sodium carbonate
2. Sodium ethoxide
3. Sodium hydroxide
4. Baking powder

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What change would you observe if a silver coin is immersed in hydrochloric acid and kept for many hours?

Q. How many parts of hydrochloric acid is present in a mixture of aqua regia?

1. 3

Q. A metal on reaction with a dilute acid liberates gas which burns with a pop sound.

1. hydrogen
2. oxygen
3. carbon dioxide
4. carbon monoxide