Oxygen

Q.

Differentiate between combination and decomposition reaction with examples.

Q.

Complete the following reaction.

$\mathrm{Fe}+\mathrm{HCl}\to$

Q.

One day Reeta went to a jeweler’s shop with her mother. Her mother gave old gold jewelry to the goldsmith to polish. The next day when they brought the jewelry back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss of weight?

Q. What percentage of oxygen is present in the earth’s crust?

1. 45%-50%
2. 88%-90%
   
3. 21%
4. 60%-70%
   

Q.

The element name "oxygen" comes from the Greek word meaning:

1. Rust

2. Fire starter

3. Air

4. Acid-forming

Q. Which of the following gases are present in air?

1. Oxygen

2. Water Vapour

3. Carbon Dioxide

4. Nitrogen

Q. What is the position of oxygen in the modern periodic table?

1. 8
   
2. 3
3. 10
4. 6

Q. Hydrogen can be prepared by mixing steam and water gas at 673 K in presence of $F{e}_2{O}_3$ and $C{r}_2{O}_3$. This process is called:

1. Laboratory preparation of hydrogen
2. Electrolysis of water
3. Bosch's process
4. Hasenclever method

Q. Which scientist gets the credit for naming oxygen?

1. Joseph Priestley
   
2. Antoine Lavoisier
   
3. Scheele
4. Henry Cavendish
   

Q. The percentage of oxygen present in the earth's crust is .

1. 21-30
2. 40-50
3. 60-70

Q.

Name 2 elements each which exist in

1) Solid state, 2) liquid state, 3) Gas state

Q.

. Hydrogen gas is absorbed by metal_____ (Cu/Pd)

Q. The oxygen occupies position in the modern periodic table.

1. 3rd
2. 8th
3. 10th
4. 6th

Q. Metals react with ________ to form their respective oxides.

1. Carbon
2. Nitrogen
3. Hydrogen
4. Oxygen

Q.

Some examples of metalloids and their uses

Q.

The non-metal which is a liquid at room temperature is ___ .

Q.

40. Which of the following gases is not present in the air?

1. Carbon dioxide

2. Sulfur dioxide

3. Oxygen

4. Nitrogen

Q.

Which compound in the given options does not contain oxygen?

1. Fat

2. Carbohydrate

3. Protein

4. Polythene

Q.

Differentiate between combination and decomposition reaction.

Q.

What gas is formed when sulphur burns in air?

1. Sulphur dioxide

2. Sulphur trioxide

3. Sulphur monoxide

4. Carbon monoxide

Q.

The credit for the discovery of oxygen goes to ______.(Dalton/Priestley)

Q. What would be the value of X in the given photosynthesis reaction?
${\mathrm{XCO}}_2+6H_{2}O\to C_6{H}_{12}{O}_6+6O_2$

1. 6

Q.

Choose the correct option:

The scientist who gave oxygen its name:

1. Lavoisier

2. Cavendish

3. Priestly

4. Dalton

Q. Oxygen can be prepared by electrolysis of water.

1. True
2. False

Q.

Why are non metals bad conductors of heat and electricity?

Q. Choose the correct option to complete the following reaction:

$2\text{Al (s)}+6\text{HCl (aq)}\to$

1. $2{\text{Al(OH)}}_3\text{(aq)}+3{\text{Cl}}_2\text{(g)}$

2. $2{\text{AlCl}}_3\text{(aq)}+3{\text{H}}_2\text{(g)}$

3. ${\text{Al}}_2{\text{O}}_3\text{(aq)}+3{\text{H}}_2\text{(g)}$
4. $2{\text{AlH}}_3\text{(aq)}+3{\text{Cl}}_2\text{(g)}$

Q.

State one relevant observation for each of the following reactions:
Action of dilute hydrochloric acid on iron (II) sulphide

Q. What percentage of oxygen will remain if 25% of it reduced during heating reaction of NaOH with H2SO4 ?

Q.

72. Classify the chemical reactions into various types depending on the way the products are formed by giving suitable examples.

Q. Which of the following is the most abundant component of air?

1. Carbon Dioxide
2. Nitrogen
3. Oxygen
4. Water Vapour