Chemical Properties of Metals

Q. Assertion: Aluminium is used as a reducing agent in the extraction of chromium from its oxide, $C{r}_2{O}_3$.
Reason: Reduction by Aluminium is known as Gold Schmidt thermite process or Aluminothermic process.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of assertion
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

Q. Silver and gold do not react with oxygen even at a high temperature because they are:

1. Highly reactive
2. Highly unreactive
3. Noble gases
4. Moderately reactive

Q.

Which metal does not reacts with oxygen?

1. Fe

2. Cu

3. Au

4. Both Cu and Au.

Q.

Which group of elements is stored in oil due to their reactive nature with water and air?

1. Transition Metals

2. Alkali Metals

3. Metalloids

4. Alkaline Earth Metals

Q.

$NaH{CO}_3$ is chemical formula of?

1. Sodium carbonate

2. Sodium hydroxide

3. Sodium Chloride

4. Sodium bicarbonate

Q.

Sodium is kept immersed in kerosene oil. State true or false

1. True

2. False

Q.

Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium.
Statement II: Lithium has 1 electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons and hence, less attraction from the nucleus.

1. Statement I is false. Statement II is false.

2. Statement I is true. Statement II is false.

3. Statement I is true. Statement II is true. Statement II is the correct explanation of statement I.

4. Statement I is true. Statement II is true. Statement II is not the correct explanation of statement I.

Q.

Li has 1 electron in its valence shell, Cl has 7 electrons in its valence shell. Choose the correct option:

1. Li and Cl have valency 1 and 7 respectively

2. Li and Cl have valency 1 and 1 respectively

3. Li and Cl have valency 1 and 6 respectively

4. Li and Cl have valency 0 and 1 respectively

Q.

Which oxide is neutral?

1. NO₂

2. H₂O

3. CaO

4. MgO

Q. In electron-sea model, the valence electrons of metal atoms are delocalized.

1. True
2. False