Question 11 Mark
What will happen if oxygen has the capacity to burn itself?
Answer
View full question & answer→If oxygen has the capacity to bum itself, striking a match stick will be enough to bum all the oxygen in our planet’s atmosphere.
Questions
[1 Mark Questions]
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Test yourself on this topic
23 questions · timed · auto-graded
Question 21 Mark
Complete the table:
Answer
View full question & answer→1. Potassium oxide $\left( K _2 O \right)$
2. Heating slightly
3. Au or Pt
4. Iron Oxide $\left( Fe _3 O _4\right)$
2. Heating slightly
3. Au or Pt
4. Iron Oxide $\left( Fe _3 O _4\right)$
Question 31 Mark
What is green house effect?
Answer
View full question & answer→- Certain gaseous molecules present in the atmosphere absorb the infra red rays and reradiate the heat in all directions.
- Hence, these gases maintain the temperature of earth’s surface.
- The gases which absorb these radiations are called green house gases and this effect is called green house effect.
Question 41 Mark
Complete the following:
Answer
View full question & answer→- Natural fixation
- From leguminous plants
- From ammonia and ammonium salts
- From nitric acid and nitrate salts
Question 51 Mark
What are the effects of global warming?
Answer
View full question & answer→- Melting of ice cap and glaciers.
- Increase in frequency of floods, soil erosion and un – seasonal rains.
- Loss of biodiversity due to the extinction of coral reefs and other key species.
- Spreading of waterborne and insectborne diseases.
Question 61 Mark
Write about occurrence of carbon dioxide.
Answer
View full question & answer→Carbon dioxide is present in air to the extent of about $0.03 \%$ in volume. It is evolved by the plants and animals during respiration and is produced during fermentation reactions. Much of the naturally occurring $CO _2$ is emitted from the magma through volcanoes. $CO _2$ may also originate from the bio - degradation of oil and gases. Human $CO _2$ emissions upset the natural balance of the carbon cycle.
Question 71 Mark
Write a note on rusting process.
Answer
View full question & answer→The process of conversion of iron into its hydrated form of oxide in the presence of air and moisture (humid atmosphere) is called rusting. Rust is hydrated ferric oxide.
$4 Fe+3 O_2 \rightarrow 2 Fe_2 O_3$
$Fe_2 O_3+XH_2 O \rightarrow 2 Fe_2 O_3 . XH_2 O$
( $X =$ Number of water molecules which is variable).
$4 Fe+3 O_2 \rightarrow 2 Fe_2 O_3$
$Fe_2 O_3+XH_2 O \rightarrow 2 Fe_2 O_3 . XH_2 O$
( $X =$ Number of water molecules which is variable).
Question 81 Mark
Write the reaction of oxygen with non – metals.
Answer
View full question & answer→Oxygen reacts with various non – metals like hydrogen, nitrogen, carbon, sulphur, phosphorus etc., to give corresponding non – metallic oxides which are generally acidic in nature
Non – metal + Oxygen → Non – metallic oxide
Example :$C + O _2 \rightarrow CO _2$
Non – metal + Oxygen → Non – metallic oxide
Example :$C + O _2 \rightarrow CO _2$
Question 91 Mark
Write any two preventive measures of global warming.
Answer
View full question & answer→- Reduction in the use of fossil fuels.
- Restricting the use of CFC’s.
Question 101 Mark
What do you mean by aerated water?
Answer
View full question & answer→Aerated water is nothing but carbon dioxide dissolved in water under pressure. This is also called soda water.
Question 111 Mark
Write any two effects of global warming.
Answer
View full question & answer→- Increase in frequency of floods, soil erosion and unseasonal rains.
- Loss of biodiversity due to the extinction of coral reefs and other key species.
Question 121 Mark
Write about the combustible property of Oxygen.
Answer
View full question & answer→Oxygen is a non – combustible gas as it does not bum on its own. It supports the combustion of other substances.
Question 131 Mark
Write any two preventive measures for acid rain.
Answer
View full question & answer→- Using CNG
- Proper disposal of the industrial wastes.
Question 141 Mark
Write the reaction of carbon dioxide with lime water.
Answer
View full question & answer→$Ca ( OH )_2+ CO _2 \rightarrow CaCO _3+ H _2 O$
Question 151 Mark
Write the reaction of oxygen with hydrocarbons.
Answer
View full question & answer→Hydrocarbon $+ O _2> CO _2+$ Water vapour + Heat energy + Light.
Question 161 Mark
Name the microbe which converts atmospheric nitrogen directly into soluble nitrogen compounds.
Answer
View full question & answer→Bacteria.
Question 171 Mark
Name some green house gases.
Answer
View full question & answer→$CO _2, N_2 O , CH _4, CFC$ (Chlorofluorocarbon) etc.
Question 181 Mark
What is acid rain?
Answer
View full question & answer→Rain mixed with sulphuric acid is called acid rain.
Question 191 Mark
How do astronauts breathe when they go beyond the earth’s atmosphere?
Answer
View full question & answer→It is because nitrogen tires hold pressure longer as compared to compressed air. Nitrogen gas in the tire escapes more slowly than compressed air does.
Question 201 Mark
It is said that sleeping beneath the tree during the night is not good for health. What is the reason?
Answer
View full question & answer→During the night trees absorb oxygen and release carbon dioxide. Therefore, anyone who sleeps under the tree, will not get oxygen, which can cause breathing problems, suffocation, etc.
MCQ 211 Mark
How does carbon dioxide react with the following?
- APotassium
- BLime water
- CSodium hydroxide
Answer
View full question & answer→Potassium combine with CO2 to form potassium carbonate.
4K + 3CO2 → 2K2CO3 + C.
4K + 3CO2 → 2K2CO3 + C.
Question 221 Mark
What is dry ice? What are its uses?
Answer
View full question & answer→- Solid carbon dioxide, called dry ice is used as a refrigerant.
- The gas is so cold that moisture in the air condenses on it, creating a dense fog which is used in stage shows and movie effects.
Question 231 Mark
What is global warming?
Answer
View full question & answer→The increased greenhouse effect is caused due to increase in air pollutants and it results in the average increase in temperature of the atmosphere. This is called Global warming.