Hydrogen from Acids

Q.

How metal react with acid

Q.

Which one is stronger $\mathrm{HCl}$ or ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Q.

How can you show that a chemical reaction involves evolution of gas?

Q.

Which acid is the queen of acids?

Q.

In a reaction between a metal and an acid, why are bubbles formed?

1. Formation of $H_2$ gas

2. Formation of $O_2$ gas

3. None of the above

4. Formation of metal salt

Q.

What is the proper composition of Aqua-regia ?

1. $1HN{O}_3+3HCl$

2. $1HN{O}_3+2HCl$

3. $1HCl+3HN{O}_3$

4. $1HCl+1HN{O}_3$

Q. Which of the following is called a noble metal?

1. Mercury
2. Gold
3. Lithium
4. Caesium

Q.

Which acid among the following is not used to produce hydrogen gas even in its dilute form on reacting with metals:-

1. Sulphuric acid

2. Hydrochloric acid

3. Nitric acid

4. Phosphoric acid

Q.

A metal on reaction with an acid liberates a gas which gives a pop sound when brought in contact with a flame. Identify the gas.

1. Oxygen gas

2. Hydrogen gas

3. Carbon dioxide gas

4. Carbon monoxide gas

Q.

Oxygen is Slightly ________ Than Air Hence It is Collected By the _________ Displacement of Water

Q.

When hydrochloric gas is passed over calcium carbonate, the gas evolved is

1. Carbon monoxide

2. Carbon dioxide

3. Hydrogen

Q.

A noble metal is one which is inert and does not react with acids like $HCl,HN{O}_3,H_{2}S{O}_4$. Select an option with a set of two noble metals.

1. Magnesium (Mg); Platinum (Pt)

2. Gold (Au); Iron (Fe)

3. Gold (Au); Zinc (Zn)

4. Gold (Au); Platinum (Pt)

Q.

Explain the reaction between Zinc and sulphuric acid. [3 MARKS]

Q.

Write the characteristics test for hydrogen has

Q.

Which of the following is true about the preparation of hydrogen gas?

1. Hydrogen is produced by the action of mineral acids on highly reactive metals like sodium and potassium

2. Hydrogen is produced by the action of mineral acids on moderately reactive metals like iron and aluminium

3. Hydrogen is produced by the action of mineral acids on low reactive metals like gold and silver

4. Hydrogen is NOT produced by the action of mineral acids on any metals.

Q.

Give 1 example which illustrates the following characteristics of a chemical reaction

(I) evolution of gas

(II) change of colour

Q.

3. Identify the following substances :

(ii) A dilute acid B which does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper.

Q.

A metal on reaction with an acid, liberates a gas which gives a pop sound when brought in contact with a flame. Identify the gas?

1. Oxygen gas

2. Hydrogen gas

3. Carbon dioxide gas

4. Carbon monoxide gas

Q.

3 (b). Discuss at least two chemical reactions in which gas is evolved.

Q.

Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Can you identify the proper composition of Aqua-regia from the given options?

1. $1HN{O}_3+3HCl$

2. $1HCl+3HN{O}_3$

3. $1HCl+1HN{O}_3$

4. $1HN{O}_3+2HCl$

Q.

Choose the correct statement:

1. Hydrogen gas is collected by downward displacement of water.

2. Hydrogen gas is collected by upward displacement of air.

3. Hydrogen gas is collected by downward displacement of air.

4. Hydrogen gas is collected by upward displacement of water.

Q. Which of following produce gas?
1.CuSo​​​​4 and Zn

Q. Which of the given reaction is explosive?

1. Na with water
2. Mg with water
3. Pt with water
4. Al with water

Q.

Indicate which of the following statements are true and which are false :

(a) Hydrogen molecule is monovalent.

(b) The removal of hydrogen from a substance is called reduction.

(c)Nitric acid can not be used to prepare hydrogen by its action on active metals.

(d) The reaction between hydrogen and nitrogen to from ammonia is reversible.

(e) Zinc can liberate hydrogen from water, acid and alkali solution.

(f) Hydrogen is combustible as well as a supporter of combustion.

(g) Hydrogen gas is easily liquefiable.

Q.

Who discovered hydrogen?

Q. Write the types of decomposition reactions.

Q.

Which of the following is a property of hydrogen?

1. colourless and pungent

2. acidic gas

3. supports combustion

4. reducing agent