CBSE Class 5 Science Oxygen Nitrogen Carbon Dioxide Worksheet

Question. Which of the following is a mineral of nitrogen ?
(A) Chile saltpetre
(B) Galena
(C) Philosopher's wool
(D) Gun metal

Answer: A

Question. In air the percentage of N₂ gas is -
(A) 77.02
(B) 78.09
(C) 76.08
(D) 75.09

Answer: B

Question. Ammonia is mainly used in manufacture of -
(A) fertilizers
(B) pesticides
(C) insecticides
(D) None of these

Answer: A

Question. Which of the following is not a source for the fixation of atmospheric nitrogen ?
(A) Lightning
(B) Artificial fixation
(C) Death and decay of plants
(D) Symbiotic bacteria

Answer: C

Question. Which of the following oxides of nitrogen is solid at room temperature ?
(A) NO
(B) N₂O₃
(C) N₂O₄
(D) N₂O5

Answer: D

Question. When equal volumes of nitrogen gas and oxygen gas at low pressure are electrically sparked, they react to form -
(A) Nitrous oxide
(B) Nitric oxide
(C) Nitrogen dioxide
(D) None of these

Answer: B

Question. Laughing gas is
(A) NO
(B) N₂O
(C) N₂O₃
(D) N₂O₅

Answer: B

Question. Nature of nitrogen towards litmus is
(A) Acidic
(B) Basic
(C) Neutral
(D) None

Answer: C

Question. Conversion of free nitrogen into useful compounds is called -
(A) fixation of nitrogen
(B) nitrogen cycle
(C) nitration
(D) None of these

Answer: A

Question. Nitrogen cannot be prepared by heating ammonium nitrite directly because -
(A) Decomposition rate of ammonium nitrite is slow.
(B) Reaction is violent and explosive in nature.
(C) Both (A) and (B)
(D) None of the above.

Answer: C

Question. Nitrogen is used -
(A) In electric bulbs
(B) As a refrigerant
(C) In preserving tinned foods
(D) All are correct

Answer: D

Question. The liquid nitrogen has boiling point – 195.8°C, it is used in preserving -
(A) Blood
(B) Cornea
(C) Eye
(D) All of these

Answer: D

Question. Which statement is not true about nitrogen ?
(A) It is insoluble in water.
(B) It is a colourless gas.
(C) It is poisonous in nature.
(D) It is as heavy as air.

Answer: C

Question. Nitrolim is obtained by passing nitrogen over
(A) Heated mixture of Al₂O₃ and carbon
(B) Carborundum
(C) Calcium carbide
(D) Heated aluminium

Answer: C

Question. Which of the following oxides of nitrogen is the anhydride of nitrous acid ?
(A) NO
(B) N₂O₃
(C) N₂O₄
(D) N₂O5

Answer: B

Question. Which of the following is formed when nitrogen reacts with metals ?
(A) Nitrates
(B) Nitrites
(C) Nitrides
(D) None of these

Answer: C

Question. Ozone is
(A) A compound of oxygen.
(B) An allotrope of oxygen.
(C) An isotope of oxygen.
(D) A mixture of atomic and molecular oxygen.

Answer: B

Question. When nitrogen gas is passed over calcium carbide, heated to 1000°C, it reacts to form
(A) Calcium cyanamide
(B) Calcium nitrate
(C) Calcium nitride
(D) None of these

Answer: A
 

Q1. Fill in the blanks using the words given in the word box.

Oxygen carbon dioxide sap photosynthesis water food sunlight chlorophyll stem starch Leaves help to make ………………………… for a plant. They contain a green substance called chlorophyll. The leaves taken in a gas called …………………………………………. The roots take in ………………………………… and other substances are dissolved into it from the ground. The ……………………………… changes the water and carbon dioxide into the food that the plant needs. This food is a kind of sugar called …………………………. Some foods we eat such as rice and potatoes also contain starch.

But this food can only be made if the plant gets plenty of ……………………………………… The ………………………………. inside the plant carries all the food around the plant to keep it healthy and to make it grow. Sap is the oozy liquid you can see when you break the ……………………………… open.

This whole process of making food is called ……………………………………………………….. While this is happening, the leaves give off a gas called …………………………………………