Chemical Reactions

Q. Why does limewater turn milky when carbon dioxide gas is passed through it?

1. Due to the formation of calcium hydroxide.
2. Because hydrogen gas is released.
3. Due to the formation of calcium carbonate.
4. Because calcium hydroxide reacts with hydrogen gas.

Q.

Is alcohol acid or a base?

Q.

Complete hydrolysis of XeF₄ and XeF₆results in the formation of XeO₃. Explain

Q.

Define strong acid and weak acids with examples?

Q.

What happens when nitric acid is added to calcium carbonate?

Q. The process of dissolving an acid or a base in water is a highly endothermic reaction.

1. True
2. False

Q.

The correct structural formula of butanoic acid is

1. 

2. 

3. 

4. 

Q.

Is magnesium oxide acidic or basic?

Q.

The standard oxidation potential of $Ni|N{i}^{2+}$ electrode = 0.236 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution will the measured emf be zero at 25 ºC. Assume $\left[N{i}^{2+}\right]$ = 1M.

1. 2

2. 3

3. 4

4. 9

Q.

Which among the following is the weakest acid?

1. HCl

2. HBr

3. HI

4. HF

Q.

What is the chemical equation and chemical reaction for magnesium ribbon?

Q.

Carbon monoxide is a _____ (basic/neutral) oxide.

Q.

What is difference between washing soda and soda ash?

Q. Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids . Describe an activity to prove it...

Q. Explain why, soap form scum with heard water whereas detergents do not

Q.

What happens when carbon dioxide gas is passed through sodium hydroxide solution ?

Q.

What happens when sodium sulphite reacts with sulphuric acid?

1. SO₂ gas is evolved

2. SO₃ gas is evolved

3. CO₂ gas is evolved

4. H₂S gas is evolved

Q.

Give two tests for hydrochloric acid.

Q. The metal which will displace zinc from zinc sulphate solution is

1. Copper
2. Magnesium
3. Nickel
4. Tin

Q.

Why is Nitric acid often yellow in color?

Q.

Why does dry HCL gas does not have any hydrogen ions?

Q.

Are metal oxides basic ?

Q. A solution of ${\text{CuSO}}_4$ was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.

Q.

when concentrated acid is added to water identify whether the process is exothermic or endothermic ??

Q.

What are the products obtained from reaction of baking soda and water?

Q.

What is strong acid, weak acid, dilute acid and concentrated acid?

And why?

How strong acid are different from concentrated acid and how dilute acid is different from weak acid?

Q.

Which of the following is not a physical property of sulphuric acid?

1. Non-electrolyte

2. Corrosive nature

3. Acidic nature

4. Sour taste

Q.

What color is ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$?

Q. Organisms of a higher trophic level feeding on different types of organisms belonging to lower trophic levels constitute a/an ______.

1. food chain
2. food web
3. food pyramid
4. ecosystem

Q.

An acid which can decolourise purple coloured potassium permanganate solution is :

(a) sulphuric acid (b) citric acid

(c) carbonic acid (d) hydrochloric acid