MCQ Questions for Class 7 Science: Ch 5 Acids, Base and Salts

MCQ Questions for Class 7 Science: Ch 5 Acids, Base and Salts

1. Which of the following is not a indicator?
(a) Phenolphthalein
(b) Methyl orange
(c) Litmus
(d) Sodium chloride
► (d) Sodium chloride

2. The reaction in which an acid react with a base to form salt and water is called as
(a) Addition reaction
(b) Displacement reaction
(c) Neutralisation reaction
(d) Substitution reaction
► (c) Neutralisation reaction

3. Acid present in soured curd is
(a) Lactic acid      
(b) Acetic acid
(c) Tartaric acid               
(d) Oxalic add
► (a) Lactic acid      

4. Which of the following is a strong Base?
(a) Copper hydroxide
(b) Sodium hydroxide
(c) Iron hydroxide
(d) Calcium oxide
► (b) Sodium hydroxide

5. Which one of the following salts is used for making detergent powder?
(a) Washing soda 
(b) Potassium nitrate
(c) Sodium bicarbonate   
(d) Common salt
► (a) Washing soda 

6. Acid present in cold drinks (soft drinks) is
(a) Carbonic acid
(b) Citric acid
(c) Tartaric acid
(d) Sulphuric acid
► (a) Carbonic acid

7. Reaction between acid and base to form salt is called
(a) Combination reaction
(b) Addition reaction
(c) Decomposition reaction
(d) Neutralization reaction
► (d) Neutralization reaction

8. Sour things contain
(a) Salts
(b) Neutral
(c) Bases
(d) Acids
► (d) Acids

9. ________ is present in sour milk-
(a) Glycolic add               
(b) Lactic acid
(c) Citrus add      
(d) Tartaric acid
► (b) Lactic acid

10. Metal oxides react with water to form
(a) Acids
(b) Minerals
(c) Bases
(d) Salts
► (c) Bases

11. Organic acids are obtained from
(a) Only plants
(b) Neither plants nor animals
(c) Only animals
(d) Plants and animals
► (d) Plants and animals

12. Which of the following substance present in turmeric changes its colour on reaction with base?
(a) Lichen
(b) Magnesia
(c) Curcumin
(d) None of these
► (c) Curcumin

13. Complete the following analogy: Sea water : Salty:: ______: Soap
(a) Bitter      
(b) Slippery
(c) Sour 
(d) Both (a) and (b)
► (d) Both (a) and (b)

14. Which of the following does not form an acidic salt?
(a) Phosphoric acid    
(b) Carbonic acid    
(c) Hydrochloric acid    
(d) Sulphuric acid
► (b) Carbonic acid    

15. Sodium chloride turns
(a) Methyl orange yellow
(b) Blue litmus red
(c) No change in colour
(d) Red litmus blue
► (c) No change in colour

16. Antacids contain:
(a) weak base       
(b) weak acid
(c) strong base     
(d) strong acid
► (a) weak base       

17. Sharp pain caused by an ant bite is due to:
(a) malic acid                   
(b) nitric acid
(c) formic acid  
(d) lactic acid
► (c) formic acid  

18. Turmeric stains turns into ___________ when washed with soap.
(a) Blue
(b) Green
(c) Orange
(d) Red
► (d) Red

19. Sodium hydroxide is found in
(a) Common salt
(b) Petrol
(c) Lemon table salt
(d) Soap
► (d) Soap

20. Which of the following in not a natural indicator?
(a) Phenolphthalein
(b) Rose petals
(c) Litmus
(d) Turmeric
► (a) Phenolphthalein

21. Sodium bicarbonate is commonly called
(a) Lime water                 
(b) Slaked lime
(c) Washing soda             
(d) Baking soda
► (d) Baking soda

22. Complete the following analogy: Turmeric: Indicator:: Milk of magnesia:
(a) Strong acid
(b) Antacid
(c) Antidote for sting
(d) Hydrated salt
► (b) Antacid
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