Gases | Science | Class: 10 | Guide/ Notes/Exercise | SEE

- Spk Saugat (Class: 10 student(2080))

Table of contents:

1. Multiple Choice Questions (MCQs)

2. Very Short Questions (VSQs)

3. Short Questions (SQs).

Multiple Choice Questions (MCQs)

1.Which gas is used in making the blue print.

i.CO₂

ii. NH₃

iii. H₂

iv. N₂

2. What are necessary required condition to manufacture ammonia by Haber's process ?

i. heat, pressure and catalyst

ii. heat, pressure and promoter

iii. Pressure, catalyst and promoter

iv. heat, pressure, catalyst and promoter

3. Which of the lightest gas?

i.CO₂

ii. NH₃

iii. O₂

iv. H₂

4.Which of the salt formed by the reaction between carbon dioxide and lime water?

i. calcium bisulphate

ii. calciwm bicarbonate

iii. calcium sulphate

iv. calcium carbonate

5. What is the molecular formula of urea?

i. NH₂CONH₂

ii. CH₃OCH₃

iii. NH₂CONH₄

iv. NH₄CONH₄

6.The aqueous solution of gas that turns red litmus paper to blue is....?

i.CO₂

ii. NH₃

iii. H₂

iv. N₂

6.Which of the following is nat a greenhouse gas?

i. Carbon dioxide

ii. Sulphur dioxide

iii. Methane

iv. Nitrogen

7. Which of the following chemical compound is formed when carbon dioxide gas passed to lime water for a long time?

i. Calcium sulphate

ii. Calcium carbonate

iii. Calcium bicarbonate

iv. calcium oxide

8. The mixture of 5% carbon and 95% oxygen is known as

i. Carbon

ii. Blue print

iii. Carbogen

iv. Dry ice

9. The molecular formula of quick lime

i. CaO

ii. Ca(OH9)₂

iii. CaCO₃

iv. H₂CO₃

10. The chemical are contained in a fire extinguisher?

i. NaHCO₃

ii. NaHCO₃ + H₂SO₄

iii. H₂SO₄

iv. HCl

11. Which gas is used for refrigeration and fire extinguisher.

i.CO₂

ii. NH₃

iii. O₂

iv. N₂

12. Which gas is Basic in Nature.

i.CO₂

ii. NH₃

iii. O₂

iv. All of them

13. Which gas is used in photosynthesis in plant?

i. Ammonia

ii. Carbon dioxide

iii. Ammonium

iv. all of them

14. Which gas is color less with a pungent smell?

i. Ammonia

ii. Ammonium

iii. Carbon dioxide

iv. Nitrogen

Very Short Questions (VSQs)

1. What is dry ice?

Ans: When carbon dioxide is cooled at -78^o C, it changes into a white solid form is called dry ice.

2. Name the chemicals which are required to prepare carbon dioxide gas in laboratory.

Ans: (a) Calcium carbonate

(b) Dilute hydrochloric acid

3. Write down the molecular formula and Molecular weight of carbon dioxide?

Ans: The Molecular formula of Carbon dioxide is CO₂ and Molecular weight is 44 amu.

4. What is the percentage of carbon dioxide present in atmosphere.

Ans: 0.03% of carbon dioxide present in atmosphere.

5. Write any two physical properties of Carbon dioxide

Ans: The two physical proportes of Carbon dioxide are:

i. It is solidifies at -78^o C.

ii. It is 1.5 times heavier than air.

6. Which gas is obtained by reaction lime stone and dilute hydrochloride acid?

Ans: Carbon dioxide gas is obtained by the reaction lime stone and dilute hydrochloride acid.

7. Name any two chemical required for preparation of Ammonia gas.

Ans: The two chemicals required for preparation of ammonia gas are;

i. Ammonium Chloride

ii. Calcium hydroxide

8. Which gas is product in the chemical reaction of slaked lime and Ammonium chloride?

Ans: Ammonia gas is product in the chemical reaction of slaked lime and Ammonium chloride

9. Write down the molecular formula and Molecular weight of Ammonia?

Ans: The Molecular formula of Ammonia is NH₃ and Molecular weight is 17 amu.

10. Which gas is used to take out blue print?

Ans: Ammonia gas is used to take out blue print.

11. What is promoter? with an example.

Ans: A promoter is a chemical that activates the catalyst. Eg: Molybdenum.

12. What is Haber's process?

Ans: The process in which Nitrogen and Hydrogen is heated to formed Ammonia is called Haber's process.

13. What happen when carbon dioxide gas is cooled at -78⁰?

Ans: When carbon dioxide gas is cooled at -78⁰, it changes into solid state that known as dry ice .

14. What do you mean by liquor ammonia?

Ans: When Ammonia soluble with water to form ammonium hydroxide or ammonium solution, The strong solution of Ammonia is called liquor ammonia.

15. What do you mean by photosynthesis?

Ans: Photosynthesis is the process in which carbon dioxide react with water in the presence of chlorophyll and sunlight to make their own food in the form of glucose(carbohydrate).

Short Questions (SQs)

1. What happen when carbon dioxide is passes into lime water for a short time. Why?

Ans: When carbon dioxide is passes into lime water for a short time. The lime turns to milky, due to the formation of insoluble calcium carbonate.

Ca(HO)₂ + CO₂ ------>> CaCO₃ + H₂O

2. What happen when carbon dioxide is passes into lime water continuously for a long time. Why ?

Ans: When carbon dioxide is passes into lime water continuously for a short time, it form milky colour disappears slowly due to the formation of soluble calcium bicarbonate ( Ca(HCO₃))₂

CaCO₃ + CO₂ + H₂O ------>> Ca(HCO₃)₂

3. Write any three difference between carbon dioxide and ammonia.

Ans:

Carbon dioxide	Ammonia
v The molecular weight of carbon dioxide is 44 amu and molecular formula is CO₂.	v The molecular weight of Ammonia is 17 amu and molecular formula is NH₃.
v IT is acidic in nature, So it turn blure litmus paper into red.	v It is basic in nature, So it turns red litmus paper into blue.
v It is 1.5 times heavier than air.	v It is lighter than air.

4. A red litmus paper is used for testing ammonia gas . Why?

Ans: A red litmus paper is used for testing ammonia gas, because Ammonia gas is basic in nature.

5. Carbon dioxide gas is not collected down upward displacement of air, Why?

Ans: Carbon dioxide gas is not collected by down upward displacement of air because Carbon dioxide gas is 1.5 times heavier than air.

6. Carbon dioxide can be tasted with the help of moist blue litmus paper, Why ?

Ans: Carbon dioxide can be tasted with the help of moist blue litmus paper, because it is Acidic in nature. So, turns blue litmus paper into red.

7. Which gas is collected in laboratory by down displacement of air. Why?

Ans: Ammonia gas is collected in laboratory by down displacement of air, because it is lighter than air.

8. It may be dangerous to clean a well. Why?

9. Carbon dioxide does not support burning but Magnesium burn it. Why?

Ans: Carbon dioxide does not support burning but Magnesium burn it because burning Magnesium breaks down Carbon dioxide into Carbon and oxygen. So Oxygen h support to burn Magnesium.

2Mg + CO₂ ---------->> 2MgO + C

10. Why the mouth of hard glass tube is inclined downward during laboratory preparation of Ammonia.

Ans: The mouth of hard glass tube is inclined downward during laboratory preparation of Ammonia, to prevent from cracking the hard glass tube.

11. Why lime tower is used for a preparation of ammonia.

Ans: lime tower (CaO) is used for a preparation of ammonia because to obtain dry ammonia.

12. H₂SO₄ is not used in the preparation of CO₂. Why?

Ans: H₂HO₄ is not used in the preparation of CO₂ because calcium sulphate produce during reaction covers the remaining part of the lime lime stone and does not allow further reaction as calcium sulphate insouble in nature.

13. Write any four uses of carbon dioxide.

Ans:

i. It is used for fire extinguishing.

ii. It is used for in the manufacture of soft drink.

iii. IT is used for the manufacture of chemical fertilizer(urea).

iv. It is used for prepare bakery

14. Write any for physical properties of Carbon dioxide.

Ans:

i. Carbon dioxide is a colorless and odourless gas.

ii. It is 1.5 times heavier than air.

iii. It is quite soluble in water.

iv. It is non-combustible and it does not combustible.

15. What are the necessary conditions for manufacture of Ammonia By Harber's process.

Ans:

i. Temperature about 500^o C should be maintained.

ii. High pressure of about 200-900 atm.

iii. Iron is used as a catalyst.

iv. Molybdenum(Mo) are used as a promoter.

16. What happen dioxide react with Water in the present of sunlight and chlorophyll carbon. With chemical equation.

Ans: When dioxide react with Water In the present of sunlight and chlorophyll to synthesis glucose (carbonate) and oxygen. It is called Photochemical reaction.

6CO₂ + H₂O ------>> C₆H₁₂O₆ + 6O₂ ^

17. What happen when a burning Mg ribbon is inserted into a jar containing Carbon dioxide gas.

Ans: When a burning Mg ribbon is inserted into a jar containing Carbon dioxide gas, it burns continuously and forms Magnesium and oxide(White) and carbon (Black).

2Mg + CO₂ ---------->> 2MgO + C

18. What happen when ammonium hydroxide react with sulphuric acid? With chemical equation.

Ans: When ammonium hydroxide react with sulphuric acid it produce Ammonium sulphate (salt) and Water.

2NH₄OH + HSO₄ ----------->>>> (NH₄)₂ SO₄ + 2H₂O

19. Ammonia gas can be tasted with the help of moist blue litmus paper, Why ?

Ans: Ammonia can be tasted with the help of moist red litmus paper, because it is Basic in nature. So, turns Red litmus paper into Blue.

20. Write any four uses of Ammonia gas.

i. Ammonia is used in the manufacture of Washing soda.

ii. It is used for cleansing agent for removing olis and grease.

iii. IT is used for developing blue print of map.

iv. It's solution is used as a laboratory preparation reagent.

21. Write any four physical properties of Ammonia.

i. It is colorless with a pungent smell.

ii. IT is highly soluble in water.

iii. It liquefies at -33.4^o C and solidifies at -78^o C.

iv. IT is basic in nature, So it turns red litmus paper into blue

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