Uses of Metals

Q. The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270kg of aluminium metal from bauxite by hall processis

Q.

Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.

Q. Which of these metals cannot be used to prepare hydrogen by the action of an acid

A) sodium . B)iron. C) calcium. D) copper

Q.

What is electrometallurgy?

Q. The process of depositing one metal on another metal is called

1. Galvanization
2. Painting
3. Distillation
4. Corrosion

Q. Why are zinc granules used over pure zinc for the laboratory preparation of hydrogen gas?

1. The reaction with pure zinc is slow.
2. Pure zinc is unavailable.
3. Pure zinc is expensive.
4. None of the above.

Q. State True or False:
Metals like Na, K, Ca, Al cannot be obtained from their compounds by heating with carbon because their metals have a higher affinity for oxygen than they do for carbon.

1. True
2. False

Q.

During electrolytic refining of zinc, it gets deposited on_____

1. Cathode

2. Anode

3. Deposited on the cathode as well as anode

4. Remains in the solution

Q.

Comment on native and combined states of metals.

Q.

Iron displaces copper from its aqueous solution but the reverse reaction is not possible. Why?

Q.

Which of the following metals are available in free state in nature?

1. Iron

2. Sodium

3. Gold

4. Zinc

Q. What is the valency of copper?How to find the chemical formula of copper sulphate

Q. Galvanization prevents rusting of iron.

1. True
2. False

Q. Can mercury displace copper?

Q.

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Q.

Which one of the following four metals would be displaced from the solution of its salts by the other three metals?

1. $\mathrm{Mg}$

2. $\mathrm{Ag}$

3. $\mathrm{Zn}$

4. $\mathrm{Cu}$

Q.

Statement 1: It is comparatively easier to extract the metals that are present at top of the reactivity series than the metals present at the bottom of the reactivity series.
Statement 2: Metals at the top of the reactivity series are highly reactive in comparison with the metals at the bottom.

1. Only Statement 1 is true.

2. Only Statement 2 is true.

3. Both Statements are true and 2 is the correct explanation of 1.

4. Both Statements are true and 2 is not the correct explanation of 1.

Q. When silver coins are added to copper sulphate what happens

Q.

Tungsten is used for making electrodes heavy metal alloys, mining industries.

1. True

2. False

Q.

Name:

A metal used for galvanising iron

Q. What is enrichment of an ore?

Q.

Galvanized iron sheets are coated with?

Q.

In galvanization, iron sheets are dipped in molten

1. gold

2. silver

3. zinc

4. copper

Q.

Which of these metals do not react with dilute acids?

1. Ag
2. Fe
3. Na
4. Zn

Q.

Name two metals that occur in combined state.Also name the ore from which they are extracted.

Q.

By passing a certain amount of charge through NaCl solution, 9.2 litre of Cl2 were liberated at S.T.P. When the same charge is passed through a nitrate solution of metal M, 7.467 g of the metal was deposited. If the specific heat of metal is 0.216 cal/g, what is formula of metal nitrate ?

1. M(NO₃)₄

2. MNO₃

3. M(NO₃)₃

4. M(NO₃)₂

Q.

During the formation of ___________ electron transfer takes place from one atom to the other.

Q. Platinum, Sodium, Iron and Calcium can be found in its pure form in nature.

1. True
2. False

Q.

What is the moluler formula of nitrogen oxide

Q.

__________ compounds conduct electricity in a fused state or in an aqueous solution.