Reaction of Metals with Oxygen

Q.

Which metal has the highest density?

Q. The amphoteric metal oxide among the following is___.

1. $A{l}_2{O}_3$
2. $N{a}_{2}O$
3. $K_{2}O$
4. $MgO$

Q.

Which among the following metals will get corroded at the fastest rate on exposure to air and water is?

1. Iron

2. Gold

3. Copper

4. Zinc

Q. Assertion (A): Aluminium oxide is an example of amphoteric oxide.
Reason (R): Aluminium oxide reacts with both acids and bases.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q.

Silver and gold does not react with oxygen even at a very high temperature and are called as ____.

1. noble metals

2. inert metals

3. non-metals

4. None of these

Q. An element reacts with oxygen to give a compound with a high melting point. This compound is also water soluble. The element is likely to be:

1. Calcium
2. Carbon
3. Silicon
4. Iron

Q. Metal M is a major constituent of steel. On reaction with dilute hydrochloric acid, M releases a gas G which burns with a pop sound along with the formation of a greenish coloured solution C.

(i) Identify ‘M’ and ‘G’ from the following:

1. M: Iron, G: Hydrogen gas
2. M: Iron, G: Carbon dioxide gas
3. M: Magnesium, G: Hydrogen gas
4. M: Magnesium, G: Carbon dioxide gas

Q. Select from the following list: [4 MARKS]
$F{e}_2{O}_3,NO,S{O}_3,PbO,M{n}_2{O}_7$
(a) Basic oxide ......
(b) Amphoteric oxide ......
(c) Acidic oxide ......
(d) Neutral oxide .....

Q. An alkali metal M reacts with to form metal oxide. The metal oxide formed is in nature.

1. hydrogen
2. oxygen
3. basic
4. acidic
5. amphoteric

Q. Which one of the following compounds gives oxygen on heating?

1. $ZnO$
2. $CuO$
3. ${Al}_2{O}_3$
4. $HgO$

Q. does not react with oxygen even at high temperatures.

1. Copper
2. Magnesium
3. Gold
4. Silicon

Q.

Which substance is formed when aluminium reacts with oxygen?

1. ${Al}_2{O}_3$

2. $AlO$

3. ${Al}_{2}O$

4. $Al{O}_3$

Q.

what are amphoteric oxides? choose the amphoteric oxides from the following oxides
na2o, al2o3, zno, co2, k2o

Q. A metal X reacts with oxygen to give amphoteric oxide. The metal X used here can be .

1. carbon
2. potassium
3. aluminium
4. sodium

Q.

Explain the activity series accounting for each of the following phenomena:

(a) Occurrence of metals (b) Tendency to corrosion

(c) Reaction with water (d) Reaction with acid

Q. Which one of the following element shows amphoteric nature?

1. B
2. both Al and B
3. Neither Al nor B
4. Al

Q. An alkali metal M reacts with to form metal oxide. The metal oxide formed is in nature.

1. hydrogen
2. oxygen
3. basic
4. acidic
5. amphoteric

Q. Which of the following elements is preferred to be stored in kerosene oil?

1. Sodium
2. Iron
3. Silver
4. Carbon

Q. A metal X reacts with oxygen to give amphoteric oxide. The metal X used here can be .

1. sodium
2. aluminium
3. carbon
4. potassium

Q.

Which substance is formed when aluminium reacts with oxygen?

1. ${Al}_2{O}_3$

2. ${Al}_{2}O$

3. $Al{O}_3$

4. $AlO$

Q. Which of the following metals on reacting with oxygen forms an amphoteric oxide?

1. Na (Sodium)
2. Al (Aluminium)
3. K (Potassium)
4. C (Carbon)

Q. Which of the following metals form amphoteric oxide?

1. Copper
2. Silver
3. Aluminium
4. Iron