Reaction of Metals with Acid

Q.

Balance

Hydrogen sulphide + Oxygen = Water + Sulphur dioxide
By shortcut method as given in the video lecture.

Q.

During the reaction of some metals with dilute hydrochloric acid, the following observations were made.

(a) Silver metal does not show any change

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(c) The reaction of sodium metal is found to be highly explosive

(d) Some bubbles of gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

Q. What are the products formed when magnesium oxide reacts with hydrochloric acid?

1. Magnesium chloride
2. Hydrogen gas
3. Water
4. Magnesium hydroxide

Q.

Metals react with nitric acid to form __________.

1. salt and water.

2. salt and carbon dioxide gas.

3. salt, oxides of nitrogen and water.

4. Salt and nitrogen gas.

Q. Give four examples for preparation of acids by synthesis.

Q.

Which gas is evolved when dilute hydrochloric acid reacts with zinc ? Write the molecular formula of the gas.

Q.

Why does nitric acid gives hydrogen only with magnesium and manganese

Q. Give reasons for the following:
(i) In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
(ii) Commercial nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
(iii) Aluminium does not react with nitric acid of any concentration.
(iv) Conc. nitric acid renders iron passive.
(v) Nitric acid is used in purification of gold.
(vi) Aqua regia dissolves gold and platinum.
(vii) Nitric acid usually does not yield hydrogen from acids.
(viii) Lightning is a blessing in disguise.
(ix) Concentrated nitric acid is brown in colour.
(x) Concentrated nitric acid is a stronger oxidizing agent.

Q.

How do you make sodium hydroxide from sodium bicarbonate?

Q.

Is ${\mathrm{SO}}_3$ an acid or base?

Q.

Question 24.
Which of the following statements is not correct ?

(a) All metal carbonates react with acid to give a salt, water and carbon dioxide
(b) All metal oxides react with water to give salt and acid
(c) Some metals react with acids to give salt and hydrogen
(d) Some non-metal oxides react with water to form an acid

Q. The reaction which is used to join railing of railway tracks is known as

1. thermite reaction
2. cupelite reaction
3. Kobe's reaction
4. ferrite reaction

Q.

The ratio of concentrated hydrochloric acid and concentrated nitric acid in aqua regia is:

1. 1:3

2. 2:1

3. 3:1

4. 1:2

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. Gold (Au); Platinum (Pt)
2. Gold (Au); Silver (Ag)
3. Silver (Ag); Platinum (Pt)
4. Gold (Au); Iron (Fe)

Q.

Name the oxide of sulphur which reacts with water to give sulphuric acid.
In the contact process, the direct reaction between oxide of sulphur and water is avoided. In this process, what does the oxide of sulphur react with instead of water, and what is the name of the product?

Q.

Name the gas evolved when $\mathrm{HCl}$ acid is added to Zinc metal.

Q.

Describe giving all practical details, how would you prepare :

(a) copper sulphate crystals from a mixture of charcoal and black copper oxide,

(b) zinc sulphate crystals from zinc dust (powdered zinc and zinc oxide),

(c) sodium hydrogen carbonate crystals.

(d) Calcium sulphate from calcium carbonate.

Q.

Nitric acid does not react with which of the following metals?

1. Chromium

2. Magnesium

3. Manganese

4. Zinc

Q. When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

Q. Question 21
2 mL each of concentrated $\text{HCl},{\text{HNO}}_3$ and a mixture of concentrated $\text{HCl}$ and concentrated ${\text{HNO}}_3$ in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
(a) $\text{Al}$
(b) $\text{Au}$
(c) $\text{Cu}$
(d) $\text{Pt}$

Q. Reaction of manganese with nitric acid

Q. Silver iodide is precipitated when silver nitrate reacts with sodium iodide.

1. True
2. False

Q. The metal which reacts with very dilute nitric acid to evolve hydrogen gas is

1. sodium
2. manganese
3. calcium
4. aluminium

Q. Why is it suggested not to store curd in a metal container?

Q.

How does aluminium react with the following:

(a) Air, (b) Water,

(c) Acid, (d) Base.

Q.

_______________________ oxides react with bases to form salt and water.

Q. Question 8
The composition of aqua-regia is
(a) ${\text{Dil.HCl: Conc.HNO}}_3$ - 3 : 1
(b) ${\text{Conc.HCl : Dil.HNO}}_3$ - 3 : 1
(c) ${\text{Conc.HCl : Conc.HNO}}_3$ - 3 : 1
(d) ${\text{Dil.HCl : Dil.HNO}}_3$ - 3 : 1

Q. Aluminium oxide does not dissolve in water as it is not a alkali metal in that case how does Aluminium form aluminium hydroxide

Q.

Why should foodstuffs with acid components not be stored in metallic containers?

1. Metals are ductile.

2. Metal oxides are basic in nature.

3. Metals react with acids.

4. Metals are shiny.

Q.

Which of the following acids has the highest boiling point?

1. Nitric acid

2. Hydrochloric acid

3. Sulphuric acid

4. Carbonic acid