Properties of Acids

Q.

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test?

Q. Identify the products formed on reaction of calcium carbonate with hydrochloric acid.

1. Carbon dioxide
2. Calcium hydroxide
3. Calcium chloride
4. Water

Q.

Give reason why Taj Mahal is turning yellow.

Q.

Why is Sulphuric acid so strong?

Q.

What are strong and weak acids? In the following list of acids, separate strong acids from weak acids. Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, and sulphuric acid.

Q. Which of the following is basic in nature?

1. Apple
2. Lemon
3. Curd
4. Caustic soda

Q.

Acids when dissolved in water produce ________.

Q.

Is Calcium Hydroxide an Acid or an Alkali?

Q.

Give an example of a weak acid?

Q.

Acetic acid is weak acid than sulphuric acid because:

1. It has $-\mathrm{COOH}$ group

2. It has higher degree of ionization

3. It has lesser degree of ionisation

4. It decomposes on increasing temperature

Q.

Why do we use dilute nitric acid for the preparation of hydrogen gas?

1. Dilute nitric acid is safe

2. Concentrated nitric acid forms $N{H}_3$

3. Concentrated nitric acid is strong oxidising agent

4. Dilute nitric acid forms $N_{2}O$ instead of $H_2$

Q.

Name two gases which are mainly responsible for acid rain?

Q.

Question 3:

Name the acid present in lemon juice and tomato.

Q. What are strong acids and weak acids?

1. An acid which dissociates completely or almost completely in water are strong acids and an acid that dissociates only partially when dissolved in water are weak acids.
2. An acid which dissociates completely in water are strong acids and an acid which dissociates almost completely in water are weak acids.
   
3. An acid that dissociates only partially when dissolved in water are strong acids and an acid which do not dissociate completely in water are weak acids.
   
4. An acid which do not dissociate completely in water are strong acids and an acid which dissociates almost completely in water are weak acids.
   

Q.

What is / are the suffix used for all oxy-acids?

1. Suffix of -ic

2. Suffix of -ous

3. Suffix of -ic and -ous

4. None of the choices

Q. When a bee stings, it injects an acid which causes irritation. This is due to the nature of acids.

1. corrosive
2. cleaning
3. sour

Q.

On the basis of ionization explain classification of acids and bases with suitable examples. Classify acids/bases on the basis of the amount of water present in the solution.

Q.

Explain the formation of scum when hard water is treated with soap. [3 MARKS]

Q.

Our stomach produces

1. hydrochloric acid

2. sulphuric acid

3. nitric acid

4. none of these

Q.

Write any three indicators and how they change in acidic medium? [3 MARKS]

Q.

What is the term given to the salt of monobasic nitric acid?

1. Nitrates

2. Nitrites

3. Nitrides

4. None of the choices

Q.

What does exactally happen with litmus paper when it is being dropped in either base or acid to change its colour

Q. Which of the following gas is released when an acid reacts with metal carbonate?

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

Q. Identify X and Y in the reaction given below.

${\text{NaHCO}}_3\text{(s)}+\text{HCl}\text{(aq)}\to \text{NaCl}\text{(aq)}+\text{X}+\text{Y}$

1. X: ${\text{H}}_2\text{O}$, Y: $\text{CO}$
2. X: ${\text{H}}_2\text{O}$, Y: ${\text{CO}}_2$
3. X: ${\text{NO}}_2$, Y: $\text{CO}$
4. X: ${\text{N}}_2$, Y: ${\text{CO}}_2$

Q. Which of the following ions is furnished by acids in aqueous solution?

1. $O{H}^{-}$ ions
2. None of these
3. $H^{+}$ ions
4. $H_3{O}^{+}$ ions

Q. Nitric acid is used in the preparation of aqua regia.

1. False
2. True

Q. The strength of an acid depends on the concentration of the hydronium ions ________ present in a solution.

1. $H_3{O}^{+}$
2. $H^{+}$
3. $O{H}^{-}$
4. All of the above

Q. Most of the metals do not displace hydrogen from _____ acid.

Q. Nitric acid reacts with "X" and release carbon dioxide gas. Identify X from the given options.

1. Calcium carbonate
2. Hydrochloric acid
3. Sodium
4. Calcium hydroxide

Q. In the schematic diagram for the preparation of hydrogen gas as shown in the figure, what would happen if the following changes are made?

1. Less gas would be evolved.
2. More gas would be evolved.
3. No gas would be evolved.
4. Almost same amount of gas is evolved.