CBSE Questions for Class 7 Chemistry Acids Bases And Salts Quiz 4 - MCQExams.com

Which of the following set of substances contain acids only?
  • Grapes, lime water
  • Vinegar, soap
  • Curd, milk of magnesia
  • Curd, vinegar
Identify the tube(s) in which the colour of red litmus paper turns blue.
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  • Test tube A
  • Test tube B
  • Test tube C
  • All of the above
When ants bite, they inject ______.
  • formic acid
  • methanol
  • glacial acetic acid
  • stearic acid
Which substance when dissolved in water changes red litmus paper to blue.
  • Tooth paste
  • Milk of magnesia
  • Shower cream
  • All of the above
Which one of the following will turn blue-litmus red?
  • Vinegar
  • Lime water
  • Baking soda solution
  • Washing soda solution
Aqueous solution of $$ NaOC_2H_5 $$ 
  • Turns blue litmus red
  • Turns red litmus blue
  • Turn red litmus green
  • none of the above
Which of the following is acidic in nature?
  • Lime juice
  • Limewater
  • Human blood
  • Antacid
Starch paper is used to test for the presence of
  • Iodine
  • Oxidising agent
  • Iodine ion
  • Reducing agent
A solution of methyl amine:
  • turns blue litmus red
  • turns red litmus blue
  • does not affect red or blue litmus
  • bleaches litmus
Which of these is used to reduce the acidity of soil?
  • Calcium hydroxide
  • Ammonium sulphate
  • Ammonium nitrate
  • Ammonium chloride
A solution of sodium acetate in water will___________
  • turn red litmus blue
  • turn blue litmus red
  • not effect litmus
  • decolourises litmus
The colour of pH paper strip at the pH valued of $$ 1, 7 $$ and $$14$$ will be : 
  • Green, red and blue
  • Red, green and blue
  • Blue, green and red
  • Green, blue and red
'Litmus', a natural dye is an extract of which of the following?
  • China rose (Gudhal)
  • Beetroot
  • Lichen
  • Blue berries (Jamun)
Neutralisation reaction is a 
  • Physical and reversible change
  • Physical change that cannot be reversed
  • Chemical and reversible change
  • Chemical change that cannot be reversed
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
  • Organic matter
  • Quick lime
  • Slaked lime
  • Calamine solution
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
  • Basic
  • Either acidic or basic
  • Either acidic or neutral
  • Either basic or neutral
State whether the following statement is true or false, correct if false.
All substances are either acidic or basic.
  • True
  • False
State whether the following statement is true or false, correct if false.
A compound if acidic will turn all indicators red.
  • True
  • False
State whether the following statement is true or false. Correct the false statement.

Phenolphthalein is a natural indicator.
  • True
  • False
State whether the following statement is true or false. If false then correct the false statement.

Common salt dissolved in water turns blue litmus red.
  • True
  • False
State whether the following statement is true or false. Correct if it's a false statement.

Calamine can be used to treat ant's sting.
  • True
  • False
State whether the following statements are true or false. Correct the false statements.

Lime water turns red litmus blue.
  • True
  • False
State whether the following statements are true or false. Correct the false statements.

Lemon water is basic in nature.
  • True
  • False
Acid present in tamarind is:
  • lactic acid
  • citric acid
  • tartaric acid
  • acetic acid
Aqueous solution of a base 
  • Turns blue litmus into red
  • Turns red litmus into blue
  • Turns litmus solution colourless
  • Has no effect on litmus solution
Acids change blue litmus to?
  • White
  • Red
  • Black
  • Purple
The compound used for neutralisation of excess $$HCl$$ in the stomach is:
  • Vinegar
  • $$Mg(OH)_{2}$$
  • Both A and B
  • None of these
Mark 'T' if the statement is true and 'F' if it is false:

Sodium hydroxide turns blue litmus red.
  • True
  • False
Which of the following is true?
  • Litmus is extracted from mulberry trees
  • Litmus is a water soluble mixture of different dyes
  • Litmus is extracted from different trees
  • Litmus is the universal indicator
A substance which tastes bitter and turns red litmus to blue is called a .......... .
  • Base
  • Acid
  • Neutral
  • None of the above
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