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CHEMISTRY [1 Mark Question Answer]

Air and Atmosphere · ICSE STD 6 (ICSE - English Medium). 47 questions.

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[1 Mark Question Answer]

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47 questions · timed · auto-graded

Question 11 Mark
Give word equation for the following conversion:
Nitric acid to soluble nitrates in the soil
Answer
Nitric acid+ calcium carbonate → Calcium nirtate + water + carbon dioxide
The water soluble calcium nitrates are absorbed by the plants and converted to plant proteins.
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Question 21 Mark
Give word equation for the following conversion:
Nitrogen dioxide to nitric acid
Answer
Nitric dioxide + Oxygen + water → Nitric acid
The nitric acid formed comes down with the rain and combines with the carbonates in the soil to form soluble nitrates.
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Question 31 Mark
Give word equation for the following conversion:
Nitric oxide to nitrogen dioxide
Answer
Nitric oxide + Oxygen → Nitrogen dioxide
The nitrogen dioxide further reacts with oxygen and water vapour of the air to give nitric acid.
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Question 41 Mark
Give word equation for the following conversion:
Nitrogen of the air to nitric oxide
Answer
Nitrogen + Oxygen ⇌ Nitric oxide
The nitric oxide reacts with oxygen to give nitrogen dioxide.
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Question 71 Mark
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
Answer
Helium
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Question 81 Mark
Name the following:
The product of respiration released in exhaled air, other than carbon dioxide.
Answer
Water vapour and energy.
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Question 91 Mark
Name the following:
The type of bacteria which directly absorb nitrogen from the air and converted soluble nitrates in the soil.
Answer
Symbiotic bacteria.
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Question 101 Mark
Name the following:
The component of air which is present more in industrial areas.
Answer
Carbon monoxide, sulphur dioxide, oxides of nitrogen, hydrogen sulphide, dust particles.
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Question 121 Mark
Name the following:
The active component of air which supports combustion and is used up in burning
Answer
Oxygen
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Question 141 Mark
Name the following:
The product formed when phosphorus burns in oxygen.
Answer
Phosphorus pentoxide $\left( P _2 O _5\right)$.
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Question 161 Mark
Name two air pollutants which cause global warming.
Answer
Two air pollutants that cause global warming are:
1. CARBON DIOXIDE $\left( CO _2\right)$
2. METHANE $\left( CH _4\right)$
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Question 171 Mark
Name two air pollutants which cause acid rain.
Answer
Two air pollutants that cause acid rain are:
1. SULPHUR DIOXIDE $\left( SO _2\right)$ and
2. NITROGEN DIOXIDE $\left( NO _2\right)$
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Question 181 Mark
Name two air pollutants which affect our health.
Answer
Two air pollutants that affect our health are:
  1. DUST
  2. SMOKE
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Question 191 Mark
What is air pollution?
Answer
Air Pollution: “Mixing of UNWANTED and HARMFUL SUBSTANCES in the air is called AIR POLLUTION.”
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Question 201 Mark
How is air useful to scooters and cars.?
Answer
Air filled tyres of cars move smoothly on road as there is less friction.
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Question 221 Mark
How is air useful to agriculture?
Answer
Air speeds up drying up of agricultural products like grains, pulses fruits, etc. Air helps in the pollination of flowers and dispersal of seeds.
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Question 251 Mark
What are the two necessary conditions for rusting of iron?
Answer
Conditions for rusting:
  1. Presence of moisture (water).
  2. Presence of oxygen (air).
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Question 261 Mark
Define rusting?
Answer
Rusting: Slow conversion of iron into its hydrated oxide in the presence of moisture and air is called rusting.
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Question 271 Mark
Give reason:
When water is heated, we see bubbles rising up.
Answer
These bubbles come from the air dissolved in water. The marine life uses air dissolved in water.
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Question 281 Mark
Give reason:
A burning candle stops burning if covered with a glass tumbler
Answer
Oxygen is necessary for combustion when covered with a glass tumbler supply of oxygen stops.
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Question 291 Mark
Give reason:
Aquatic animals and plants are able to survive in the matter.
Answer
Aquatic animals and plants use oxygen dissolved in water and survive.
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Question 301 Mark
Give two examples of modern fuels.
Answer
Examples:
  1. CNG (Compressed natural gas)
  2. LPG (Liquefied natural gas)
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Question 311 Mark
What are fuels?
Answer
Fuels: The substances which burn in air to produce a large amount of energy in the form of heat and light are called fuels.
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Question 321 Mark
Define the following:
Combustion.
Answer
Combustion: Combustion also called burning “is burning of substance in the oxygen of air completely producing heat and light is called combustion.”
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Question 331 Mark
What is nitrogen fixation?
Answer
Nitrogen cannot be absorbed directly by plants. It is first fixed up in the soil as nitrites and nitrates and then absorbed by the plants in soluble forms. This phenomenon is called nitrogen fixation.
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Question 341 Mark
Why is nitrogen important to all living beings?
Answer
Nitrogen constitutes 78% of air by volume. It is of vital importance to the plants, animals, and human beings as it is needed to prepare vital nutrient ‘protein’ to every living being which is necessary for their growth.
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Question 351 Mark
Name two important processes supported by oxygen present in air.
Answer
Two processes supported by oxygen present in air are:
  1. Combustion
  2. Respiration
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Question 361 Mark
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Answer
We will observe randomly moving dust particles in the beam of light. This confirms the presence of dust particles in the air.
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Question 371 Mark
What do you observe when Carbon dioxide gas is passed through lime water.
Answer
When$CO _2$ gas is passed through lime water it forms calcium carbonate which is white precipitate (turbidity). This gives the milky white appearance to the solution.
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Question 381 Mark
What do you observe when burning candle is covered with an inverted jar.
Answer
The candle burns more brightly because the candle gets oxygen support in burning.
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Question 391 Mark
What do you observe when Ice cold water is filled in a glass tumbler.
Answer
We will observe that fine water droplets get deposited on the outer wall of the glass tumbler.
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Question 411 Mark
Why can’t we see air?
Answer
We can’t see air because it is colourless, odourless and transparent gaseous matter.
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Question 421 Mark
What is atmosphere?
Answer
The earth is surrounded by a thick layer of air called the atmosphere that extends upto a height of about 320 kilometres above the surface of the earth.
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Question 431 Mark
Give a reason why water droplets appear on the outer surface of a tumbler containing ice.
Answer
Water vapour present in air, condenses on the cooler surface of the tumbler. Hence they condenses into tiny water droplets.
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Question 441 Mark
State in brief how water vapour in the atmosphere determines the climatic conditions
Answer
Water vapour in the atmosphere in excess :
  1. Minimizes the rate of evaporation.
  2. Produces rain, mist, etc. thereby determining climatic conditions.

The rain serves as a natural source of water for plants and animals.

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Question 451 Mark
Give a reason why nitrogen is filled in food packets and not oxygen.
Answer
Nitrogen being inert or unreactive is filled into food packets to drive out the oxygen and reduce bacterial growth. The food package then stays well preserved.
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Question 461 Mark
Explain the importance of nitrogen of the air for plant growth.
Answer
Nitrogen of air is converted to soluble nitrogenous compounds in the soil in the presence of air and moisture. These are absorbed by plants and converted to plant proteins.
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Question 471 Mark
State what do you understand by the term ‘air’. Explain its importance to mankind.
Answer
Air is a mixture whose composition varies at different intervals of time and different places of the world. Man cannot survive without air and water and hence the air is very essential for survival.
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[1 Mark Question Answer] - CHEMISTRY STD 6 Questions - Vidyadip