Bases

Q.

What is a salt solution

Q.

To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is

1. acidic

2. neutral

3. basic

4. corrosive

Q.

Is sodium hydroxide an alkali?

Q.

What will be the colour change when methyl orange is added to sodium hydroxide?

1. Blue

2. Yellow

3. Pink

4. Green

Q.

Antacids contain strong base or weak base?

Q. The aqueous solution of sulphuric acid changes red litmus to blue.

1. False
2. True

Q.

what do you mean by alkali?

Q.

why does litmus paper turn its colour into red when it is dropped in acid and blue when it is dropped in bases

Q.

Which of the following compounds are used by farmers to neutralise acidic soil character?

1. CaO

2. None of the choice

3. MgOH₂

4. Na₂CO₃

Q.

Write five differences between properties of acids and bases. [5 MARKS]

Q.

Give an example of a substance which does not contain acid.

Q.

What will be the colour change when phenolphthalein is added to hydrochloric acid?

1. Pink

2. Colourless

3. Green

4. Blue

Q.

Lime water is a solution of

1. Calcium hydroxide($\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$).

2. Calcium hydroxide($\mathrm{Ca}\left(\mathrm{OH}\right)$)

3. Calcium hydroxide($\mathrm{Ca}\left({\mathrm{O}}_2{\mathrm{H}}_2\right)$)

4. Calcium hydroxide($\mathrm{Ca}\left({\mathrm{OH}}_2\right)$)

Q.

The sulphurous acid turns _________ litmus paper to _________.

Q.

Which is the only non-metal hydride that is basic in nature?

1. $H_{2}S$

2. $H_{2}O$

3. $N{H}_3$

4. $HN{O}_3$

Q.

What are tri acidic bases? Give one example? [2 MARKS]

Q.

Which metallic hydroxide is pink in colour and is used as an antacid?

1. $Ca(OH{)}_2$

2. $Zn(OH{)}_2$

3. $Mg(OH{)}_2$

4. $Al(OH{)}_3$

Q.

Alkali which dissociates only partially in aqueous solution is

1. Lithium hydroxide

2. Calcium hydroxide

3. Potassium hydroxide

4. Sodium hydroxide​

Q.

State the properties of bases

Q.

Name the gas evolved when ammonium salts are treated with alkalis.

Q.

Out of Na₂CO₃ and NaHCO₃ which acts as an antacid?

Q.

Do basic solutions also have $H^{+}$ (aq) ions? If yes, then why are these basic? [2 MARKS]

Q. The Taj Mahal, an immense mausoleum in Agra is made up of .

1. plaster of paris
2. silica
3. calcium carbonate
4. calcium hydroxide

Q.

Ammonia is found in many household products, such as window cleaners. Mixed with water, it turns red litmus blue. What is its nature?

1. Neutral

2. Acidic

3. Basic

4. Can't say

Q.

What is a base? Give one example. [2 MARKS]

Q.

Is ammonia a base or acid?

Q. To protect tooth decay, we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is __________in nature.

1. basic
2. neutral
3. None of the above
4. acidic

Q. Which one of the following species acts as both Bronsted acid and base?

1. $H_{2}P{O}_2^{-}$
2. $HP{O}_3^{2-}$
3. $HP{O}_4^{2-}$
4. All of these

Q. Potassium hydroxide is a strong base.

1. True
2. False

Q.

Classify bases on the basis of their strength. [3 MARKS]