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Q1. Which of the following base is used as a cleansing agent?

• Magnesium hydroxide
• Calcium hydroxide
• Sodium hydroxide
• Ammonium hydroxide

Solution

Ammonium hydroxide is used as a cleansing agent.

Q2. Which of these acids are present in acid rain?

• Carbonic acid
• Sulphuric acid
• Nitric acid
• All of above

Solution

The rain becomes acidic because carbon dioxide, sulphur dioxide and nitrogen dioxide (which are released into the air as pollutants) dissolve in rain drops to form carbonic acid, sulphuric acid and nitric acid respectively

Q3. Which of these substances are found in our body?

• Hydrochloric acid (HCl)
• Deoxyribonucleic acid (DNA)
• Fatty acids
• All of these

Solution

Hydrochloric acid is present in stomach. Deoxyribonucleic acid is present in cells of our body. Fats in our body contain fatty acids.

Q4. Which of these acid is present in ant's sting?

• Nitric acid
• Sulphuric acid
• Formic acid
• All of above

Solution

The sting of an ant contains formic acid.

Q5. Phenolphthalein does not show pink colour with which of these substances?

• Ammonia
• Lime water
• Sour milk
• Baking soda

Solution

Sour milk has lactic acid and phenolphthalein does not show pink colour with acids.

Q6. What is the taste of a base?

• Sweet
• Salty
• Sour
• Bitter

Solution

Generally all bases are bitter in taste.

Q7. If a drop of ammonia solution is added to turmeric paste, the colour of paste will change to:

• Green
• Red
• Pink
• Remain same

Solution

Bases change the colour of turmeric paste to red. As calcium hydroxide is a base so it changes the yellow color of turmeric paste to red.

Q8. Which of the following is not a natural indicator?

• Turmeric
• China rose
• Litmus
• Phenolphthalein

Solution

Phenolphthalein is a synthetic indicator.

Q9. In neutralisation reaction, which of the following is/are produced?

• Heat
• Salt
• Water
• All of these

Solution

The reaction between an acid and a base is known as neutralisation reaction. Salt and water are produced in this process along with the evolution of heat.

Q10. Which of the following acid is present in 'amla'?

• Formic acid
• Acetic acid
• Ascorbic acid
• Lactic acid

Solution

Amla contains ascorbic acid.

Q11. Which of the following will react with base to undergo a neutralisation reaction?

• Sodium hydrogen carbonate
• Sodium carbonate
• Hydrochloric acid
• Sodium hydroxide

Solution

Hydrochloric acid is an acid. It will react with a base to form salt and water.

Q12. Which of these will show no effect on blue litmus solution?

• Vinegar
• Water
• Orange juice
• Lemon juice

Solution

Water is a neutral substance. Neutral substances don't change the colour of the indicators like litmus solution.

Q13. If a drop of lime juice is put on red litmus paper, the colour of litmus paper will change to:

• Blue
• Pink
• Green
• Remains the same

Solution

Acids change the colour of blue litmus to red but do not affect the red litmus paper so its colour will remain same.

Q14. What will happen if solution of baking soda is put on turmeric paper?

• The colour of turmeric paper changes from yellow to blue.
• The colour of turmeric paper changes from yellow to green.
• The colour of turmeric paper changes from yellow to red.
• The colour of turmeric paper changes from yellow to magenta.

Solution

Baking soda is a basic substance and thus changes the colour of yellow turmeric paper to red.

Q15. Phenolphthalein undergoes a color change with which of the following?

• Soap solution
• Shampoo (dilute solution)
• Window cleaner
• All of above

Solution

All bases turn phenolphthalein pink and all the substances mentioned above are basic in nature.

Q16. Which of the following substances change colour of China rose indicator to green?

• Glucose solution
• Distilled water
• Soda water
• Common salt solution

Solution

Soda water is basic in nature. Bases change the color of China rose indicator to green.

Q17. Which of the following makes the soil basic?

• Growing of crops
• Decaying organic matter
• Excessive use of nitrogen fertilizers
• Irrigation through rivers

Solution

Excessive use of nitrogen fertilizers make the soil basic.

Q18. Which of these can be used as a cure for ant's sting?

• Moist baking soda
• Vinegar
• Curd
• Lemon juice

Solution

The effect of the ant sting can be neutralised by rubbing moist baking soda.

Q19. What is the nature of distilled water?

• Acidic
• Basic
• Neutral
• All of above.

Solution

Distilled water does not show any color change with indicators.

Q20. Which of the following acid is present in tamarind?

• Tartaric acid
• Formic acid
• Lactic acid
• Acetic acid

Solution

Tamarind contains tartaric acid

Q21. Which of these will show color change with china rose indicator?

• Glucose solution
• Distilled water
• Soft drink
• Sugar solution

Solution

Soft drinks contain carbonic acid and hence change the color of china rose indicator to dark pink.

Q22. Which of the following contains a base?

• Vinegar
• Oranges
• Antacids
• Ant sting

Solution

Antacids are weak bases. Vinegar contains acetic acid, oranges contain citric acid and ant sting contains formic acid.

Q23. Vitamin C is found in abundance in

• Vegetables
• Citrus fruits
• Cereals
• Pulses

Solution

All citrus fruits are rich in vitamin C.

Q24. Which of the following statement is true?

• Bases turn the colour of blue litmus to red.
• Bases turn the red colour of turmeric to yellow.
• Bases turn the yellow colour of turmeric to red.
• Bases do not change the colour of yellow turmeric.

Solution

Turmeric is a natural indicator. Bases turn yellow turmeric red.

Q25. Which of the following is not a base?

• Sodium hydroxide
• Soap
• Sodium hydrogen carbonate
• Carbon dioxide

Solution

Sodium hydroxide, soaps and sodium hydrogen carbonate all are bases.

Q26. Which of the following is present in most of the factory wastes?

• Bases
• Neutral salts
• Acids
• Distilled water

Solution

Most factory wastes contain acids.

Q27. Which of these will show no effect on turmeric paper?

• Lemon juice
• Sodium hydroxide
• Potassium hydroxide
• Lime water

Solution

Lemon juice is an acid and acids do not change the colour of turmeric paper. Bases change the colour of turmeric paper.

Q28. To neutralise the effect of acidic soil, which of the following substance can be used?

• Acetic acid
• Slaked lime
• Hydrochloric acid
• Magnesium hydroxide

Solution

Slaked lime or calcium hydroxide being basic in nature can neutralise the acidity of soil.

Q29. To neutralise sodium hydroxide solution (NaOH), which of the following substance can be used?

• Hydrochloric acid
• Washing soda
• Shampoo (dilute solution)
• Lime water

Solution

As NaOH is a base, it can be neutralised by an acid like hydrochloric acid.

Q30. Which of the following acid is used in car batteries?

• Hydrochloric acid
• Sulphuric acid
• Nitric acid
• Acetic acid

Solution

Sulphuric acid is used in lead-acid batteries.

Q31. Which of the following substances change the colour of China rose to dark pink or magenta colour?

• Acids
• Bases
• Salts
• All of the above.

Solution

Acids turn China rose indicator to dark pink or magenta colour.

Q32. Which of the following compound/compounds feel soapy to touch?

• Potassium hydroxide
• Calcium hydroxide
• Sodium hydroxide
• All of the above

Solution

Bases feel soapy to touch.

Q33. Which of the following substance helps in reducing the irritation caused due to the sting of an ant?

• Vinegar
• Lemon juice
• Calamine (zinc carbonate)
• Orange juice

Solution

Calamine being a basic substance can neutralise the effect of acid present in ant sting.

Q34. Which of the following is false about indicators?

• Indicators change colour to indicate the presence of some substances.
• Certain indicators are used to test the completion of a chemical reaction.
• Turmeric is a synthetic indicator
• Litmus is available in form of solution

Solution

Turmeric is a natural indicator.

Q35. If a drop of baking soda is put on blue litmus paper, the colour of litmus paper turns to

• Red
• Yellow
• Green
• Remains same

Solution

Baking soda is a base and hence shows no color change with blue litmus paper.

Q36. Blue litmus will change into red litmus by which of these followings?

• Grape juice
• Window cleaner
• Soap solution
• Milk of magnesia

Solution

Grape juice has tartaric acid in it. Acids change the colour of blue litmus paper to red.

Q37. Our stomach contains which acid?

• Oxalic acid
• Tartaric acid
• Hydrochloric acid
• Ascorbic acid

Solution

Our stomach contains hydrochloric acid

Q38. If a drop of vinegar is added to China rose indicator, what will be the change in colour of the indicator?

• It will change to dark pink colour.
• It will change to blue colour.
• It will change to green colour.
• It will remain same.

Solution

Vinegar contains acetic acid. Acids change the color of China rose indicator to dark pink or magenta.

Q39. The nature of salt produced in a neutralisation reaction can be:

• Acidic
• Basic
• Neutral
• All of above

Solution

Depending upon the acids and bases used for neutralisation reaction, the salt formed can be acidic, basic or neutral.

Q40. Which of the following bases cannot be used as antacids?

• Sodium carbonate
• Magnesium hydroxide
• Sodium hydrogen carbonate
• None of the above.

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