10th science Refresher Course 12-APPLIED CHEMISTRY answer key

10th science Refresher Course 12-APPLIED CHEMISTRY answer key

unit 1 - 10th Science APPLIED CHEMISTRY Answer
Title : 10th science Bridge course Answer Worksheet 12

10th science Refresher Course-12-APPLIED CHEMISTRY-answer key


I. Choose the best answer:

1. Name the elements present in hydrocarbon

a) C & O 

b) H & N 

c) C & H

2. What is the molecular formula for methane?

a) CH4 

b) C2


c) C3H8

3. What is the percentage of carbon in lignite?

a) 25-35% 

b) 35-44% 

c) 86-97%

4. Which coal gives highest thermal energy?

a) Lignite 

b) Anthracite 

c) Bituminous

5. C = C

a) Alkane 

b) Alkyne 

c) Alkene

6. Which is a renewable source of energy?

a) Bio-gas b) Coal – gas c) Petroleum

7. Radiochemistry deals with

 (a) oxidants (b) batteries (c) isotopes (d) nanoparticle

II. Fill in the blanks:

1. Mixture of gases present in LPG are _____ & ______

2. Expansion of CNG ____

3. Biogas is the mixture of ______ & ______

4. Example of fossil fuel _____

5. Percentage of carbon in coke is ______

6. The country that has the world’s largest coal stockage is _____

7. The fossil fuel that is known as Black – Diamond is _____

8. ____________ is an electrochemical cell which converts electrical energy into chemical change(Reaction).

III. Say True or False

1. The producer gas is used in museums to protect the monuments

2. Water gas is a gaseous mixture of carbon monoxide and hydrogen.

3. Coal gas is obtained by the destructive distillation of coal.

4. An ideal fuel should have high calorific value.

IV. Find the odd one out:

1. Methane, Ethane, Propane, Benzene.

2. Lignite, Bituminous, Anthracite, Erythrocytes.

3. Petrol, Coke, Coal tar, Coal gas.

V. Answer the following:

1. Batteries that are used in mobile phone can be recharged. Likewise, can you recharge the

batteries used in watches? Give reasons.

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