Strength of Acids and Bases

Q. A and B are the two solutions with pH 1 and 13 respectively. The colour of the solutions when tested with pH paper respectively are

1. red and violet
2. violet and yellow
3. red and green
4. orange and violet

Q.

Which of the following oxides is amphoteric in nature?

1. $\mathrm{CaO}$

2. ${\mathrm{CO}}_2$

3. ${\mathrm{SiO}}_2$

4. ${\mathrm{SnO}}_2$

Q.

Make lists of acidic salts , basic salts and neutral salts with their source acids and bases

Q.

What are the Five Acids in Common Use?

Q.

When zinc reacts with sodium hydroxide, the products formed are

1. zinc hydroxide and sodium

2. sodium zincate and water

3. sodium zincate and hydrogen gas

4. sodium zincate and oxygen.

Q.

Complete and balance the following equation:

$\mathrm{CuO}+\mathrm{HCl}(dil\mathit{.})\to$

Q. Question 6
How is the concentration of hydroxide ions $\left({\text{OH}}^{-}\right)$ affected when excess base is dissolved in a solution of sodium hydroxide?

Q.

What is the conjugate acid of ${\text{HCO}}_3^{-}$?

Q.

When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is that

1. the surface of the metal turns shining.

2. the reaction mixture turns milky.

3. odor of chlorine is observed.

4. a colorless and odorless gas is evolved with bubbles.

Q.

The chemical reaction $HN{O}_3+KOH\to KN{O}_3+H_{2}O$ is an example of

1. neutralization

2. double displacement

3. neutralization and double displacement

4. combination

Q.

Complete and balance the following reaction:

${\mathrm{HNO}}_3+\mathrm{HCl}\left(\mathrm{conc}\right)\to$

Q.

"Mixing an acid or base with water results in decrease in the concentration of ions(H3O/OH-) per unit volume"

Acid when mixed with water gives out H+ ions which because they cannot exist alone form H3O ions. Then how does the concentration 'decrease' ?

Q.

What do you understand by basic radical?

Q.

By giving examples explain acidic oxides.

Q.

When ${\mathrm{NH}}_4\mathrm{OH}$ is dissolved in water it gives ${\mathrm{NH}}_4^{+}$ ion and ${\mathrm{OH}}^{-}$ ion. Is it a base or an alkali. Give reason.

Q. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

Q. Difference between dilute acid and concentrated acid? Which one is more strong/powerful?

Q.

Small pieces of a silver coloured metal X, were added to concentrated nitric acid A then brown gas Z and a colourless solution containing salt Y were formed Identify X, Y and Z.

Q. Reaction of strong acid and weak base is required to form an acidic salt. How does ammonium sulphate and ammonium nitrate which are acidic salts formed ?
i want to ask that what is the strong acid and weak base in the above examples

Q.

(a) What are amphoteric oxides?

(b) What are amphoteric metals? What happens when aluminum reacts with $\mathrm{KOH}\left(\mathrm{aq}\right)$?

Q.

Name the gas which has a smell of rotten eggs.

Q.

Name an acid used

(c) to remove ink stains.

Q. Which of the following is not an olfactory indicator?

1. Vanilla
2. Clove
3. Onion
4. Turmeric

Q.

Is CaCO₃ a base or a salt?

Q.

Is hydrogen an acid or base?

Q.

Give two examples of insoluble bases.

Q. What will be the nature of the salt formed when a strong acid reacts with a weak base?

1. Neutral
2. Basic
3. Acidic
4. Cannot be determined

Q.

Complete and balance the following reaction:

${\mathrm{K}}_2\mathrm{O}+\mathrm{HCl}\to$

Q.

Which of the following acid is a weak acid?

1. ${\mathrm{CH}}_3\mathrm{COOH}$

2. ${\mathrm{H}}_2{\mathrm{SO}}_4$

3. $\mathrm{HCl}$

4. ${\mathrm{HNO}}_3$

Q.

In which of these reactions Sulphuric acid does not act as oxidising agent

1. Sulphuric acid $+$Zinc

2. Sulphuric acid $+$Sodium hydroxide

3. Sulphuric acid $+$Sodium chloride

4. Sulphuric acid $+$Carbon.