Comparative exam chemistry note

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Comparative exam chemistry note

1. Which of the following is used to produce artificial 

rain?

A. carbon monoxide       
B. carbon oxide                 
C. silver iodide                
D. silver nitrate

Ans. silver iodide

2. What is the first element in the periodic table?

A. Hydrogen                      
B. Helium                            
C. Lithiym                                     
D. Zinc

Ans. Hydrogen

3. What is the pH value of water?

A. 7                                        
B. 6                                         
C. 8                                         
D. 5

Ans. 7

4. Which one is used in power alcohol is ___

A. propanol                        
B. ethyl alcohol                
C. methyl alcohol                        
D. ethylene glycol

Ans. ethyl alcohol           

5. Which of the following is used in preparation of dynamite?

A. glycerol                            
B. ethyl alcohol                
C. methyl alcohol                         
D. methane       

Ans. Glycerol

6. What is the fourth most abundant element in the universe in terms of mass?

A. Hydrogen                       
B. Mercury                          
C. Oxygen                                  
D. Carbon

Ans. Carbon

7. Nail polish remover contains ___

A. chlorine                          
B. benzene                        
C. methyl                                     
D. acetone

Ans. Acetone

8. What is the pH value of Blood?

A. 10.4                                  
B. 7                                        
C. 7.4                                          
D. 5

Ans. 7.4

9. Atomic number is equal to ____

A.Number of protons                                                              B.Number of electrons

C.Number of neutrons                                                            D.All of the above

Ans. Number of protons              

10. What is the atomic number of oxygen ___

A. Six                                      
B. Five                                   

C. Eight                                 
D. Ten

Ans. C

11. Which of the below gas is responsible for global warming?

A. Oxygen                           
B. Carbon dioxide            

C. Methane                         
D. Sulphur dioxide

Ans. Carbon dioxide

12. Which of the following is stranger gas?

A. Nitrous oxide                               

B. Neon                                                

C. Xenon                              

D. Argon

Ans. Xenon

13. Which of the following synthetic fibre is known as artificial silk?

A. Rayon                               
B. Cotton                             

C. Terylene                           
D. Nylon

Ans. Rayon

14. The metal that is used as a catalyst in the hydrogenation of oils is ?
A. Pb                                   
B. Ni
C. Cu                                   
C. Pt
Answer: Option B

15. Which one is an organic Acid ?
A.Sulphuric                      
B.Citric
C.Nitrc                              
D.Phosphoric
Answer: Option B

16. The material which can be deformed permanently by heat and pressure is called a
A.thermoset                     
B.thermoplastic
C.chemical compound   
D.polymer
Answer: Option A

17. The nuclear particles which are assumed to hold the nucleons together are ?
A. positrons
B. neutro
C. electrons
D. mesons
Answer: Option D

18. Which acid is present in lemon ?
A. marlic acid
B. citric acid
C. lactic acid
D. tartaric acid
Answer: Option B
Explanation:
citric acid is present in lemon.

19. Who is regarded as father of modern chemistry ?
A. Ruterford
B. Einstein
C. Lavoisier
D. C.V. Raman
Answer: Option C

20. Which element found in all organic compounds ?
A. carbon
B. nitrogen
C. calcium
D. none of them
Answer: Option A

21. Oil of vitriol is 
A. nitric acid
B. sulphuric acid
C. hydrochloric acid
D. phosphoric acid
Answer: Option B

22. The material which can be deformed permanently by heat and pressure is called a
A. thermoset
B. thermoplastic
C. chemical compound
D. polymer
Answer: Option A

23. What is hottest part of the gas flame is called ?
A. blue zone
B. luminous zone
C. dark zone
D. non-luminous zone
Answer: Option D

24. Permanent hardness of water is due to the presence of ?
A. Magnesium bicarbonate
B. Calcium bicarbonate
C. Sodium bicarbonate
D. Calcium sulphate

Answer: Option D