Laboratory Preparation

Q.

Why copper does not react with hydrochloric acid

Q. Every metal reacts with water to form metal hydroxide.

1. True
2. False

Q. What is copper +sulphuric acid

Q.

Define the granulated zinc.

Q. Why Zinc is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?

Q.

Which is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?

1. Zinc

2. Calcium

3. Magnesium

4. Sodium

Q. Choose the correct answer from the following —
(1) Highly reactive metals mostly occur in carbonates and chloride forms .
(2) Metals like Zn , Al , Pb, Sn are usually form amphoteric oxides
(3) The reaction with which metal react is same for all the metals
(4) Only (1)&(2)
[Please give reason for your answer.]

Q.

Which of the following is not an impurity present in hydrogen gas during the laboratory preparation of hydrogen?

1. Hydrogen Sulphide

2. Sulphur Dioxide

3. Carbon Dioxide

4. Calcium Chloride

Q.

Describe the role of sodium hydroxide in the process of extraction of aluminium.

Q.

Write balanced chemical equation for dilute Nitric acid added to Copper turnings

Q.

What property of metals like gold and platinum makes it so least reactive that they don't even react with hydrochloric acid?

Q. Match the following metals with their metallic salt formed when they react with NaOH.

1. Sodium zincate
2. Sodium plumbite
3. Sodium aluminate

Q.

Give one word for the following :

Zinc used in laboratory preparation of hydrogen.

Q.

______ zinc contains copper as impurity.

Q.

Give a reason for the following:

Granulated zinc is preferred for preparation of hydrogen.

Q.

Which metal does not react with anything

Q. Hydrogen is not obtained when zinc reacts with:

1. Cold water
2. Hot $NaOH$ solution
3. $Conc.H_{2}S{O}_4$
4. Dil. $HCl$

Q. In the following schematic diagram for the preparation of hydrogen gas as shown in figure, what would happen if in place of $Zn$ granules same amount of zinc dust is taken in the test tube?

Q.

two gases which react under relevant conditions to give a gas which turns a solution of pottasium mercuric iodide brown.

choose from below---------

ammonia, hydrogen chloride, sulphurdioxide, nitrogen, oxygen, hydrogen, nitric oxide, methane, ethane.

Q. Write balanced chemical equations for the following reactions.
(a) the action of water on calcium oxide
(b) the action of dilute nitric acid on zinc
(c) the reaction between sulphur dioxide and water
(d) the reaction between sodium and water
(e) the reaction between calcium and sulphuric acid
(f) the reaction between iron and copper sulphate solution
(g) the reaction between potassium and water

Q. Water gas is produced by passing steam over red hot ______.

1. coke
2. sulphur
3. phosphorus
4. iodine

Q. Which among the following indicates the presence of hydrogen gas?

1. Pop sound
2. Purple flame
3. Explosion
4. Yellow flame

Q.

Which is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?

1. Magnesium

2. Sodium

3. Zinc

4. Calcium

Q.

Write equations for the following reactions :

Copper and concentrated nitric acid.

Q.

Which of the following statements are correct regarding the process of electrolysis of water?

1. $H^{+}$ ions move towards the Cathode

2. $O{H}^{-}$ ions move toward the Anode

3. Oxygen gas evolves at Cathode

4. Hydrogen gas evolves at cathode

Q. Zinc granules are used in laboratory preparation of hydrogen because it consists of _____ which acts as a catalyst and speeds up the rate of reaction.

1. calcium
2. copper
3. silver
4. iron

Q. Which among the following can be used to remove sulphur dioxide gas during the purification of hydrogen gas?

1. Lead nitrate solution
2. Silver nitrate solution
3. Dry gas
4. Caustic potash solution

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Why granulated zinc is preferred for the laboratory preparation of hydrogen? [2 Mark]

Q. Zinc on reaction with concentrated nitric acid produces hydrogen gas.

1. True
2. False

Q.

(a) Name the chemicals required to prepare hydrogen gas in the laboratory.

(b) Give a balanced chemical equation for the reaction.

(c) Draw a neat and well-labelled diagram for the laboratory preparation of hydrogen.

(d)How is hydrogen gas collected ? Why