Chemistry Mcqs Set 61

Chemistry Mcqs Set 61

1. Which of the following reactions is not feasible/
(i) Passing carbon-di-oxide gas through an aqueous solution of sodium carbonate
(ii) Adding a piece of aluminium metal in an aqueous solution of sodium hydroxide
(iii) Adding sulphuric acid to powdered copper carbonate
(iv) Adding sodium hydroxide to a calcium oxide

2. Which of the following solution has pH=3?
(i) An aqueous solution of HCl pf 10^-3 M
(ii) An aqueous solution of NaOH of 10^-3 M
(iii) An aqueous solution of NaOH whose hydroxyl ion concentration is 10-9 M
(iv) Pure water
 
3. Lemon juice has pH 2. Tomato juice has pH 4. Toothpaste has a pH 9. Choose the correct statement
(i) Toothpaste is acidic , while both lemon juice and tomato juice are alkaline
(ii) Toothpaste and lemon juice are alkaline while tomato juice is acidic
(iii) Toothpaste is alkaline while both tomato and lemon juice are acidic
(iv) all are acidic
 
4. A solution turns red litmus blue. Its pH would be ..............
(i) 2                       
(ii) 4                   
(iii) 7                           
(iv) 9
 
5. Which of the following is a characteristic of an acid salt?
(i) Acid salts dissolve in water giving H+ ions
(ii) Acid salts are formed by adding calculated amount of a base to a poly basic acis
(iii) Acid salts are formed by the partial replacement of hydrogen ions ions ina polybasic acid
(iv) All the above
 
6. The formation of calcium hydroxide from calcium oxide and water is an example of ........................ reaction
(i) combination              
(ii) double decomposition       
(iii) decomposition    
(iv) displacement
 
7. the reaction between an aqueous solution of lead nitrate and dilute hydrochloride in ...................... reaction.
(i) double decomposition              
(ii) combination            
(iii) precipitation        
(iv) oxidation
 
8. The reaction between aqueous solution of sodium sulphate and barium chloride is ...................... reaction.
(i) precipitation            
(ii) redox          
(iii) simple displacement            
(iv) decomposition
 
9. The decomposition of potassium chlorate is faster in the presence of manganese dioxide. Manganese dioxide acts as a ..................
(i) reactant                   
(ii) catalyst              
(iii) oxidising agent           
(iv) reducing agent
 
10. .......................... react faster in dilute hydrochloric acid.
(i) powder calcium carbonate          
(ii) Marble          
(iii) Iron rod  
(iv) Crystalline sodium chloride