Class 7 Acids Bases And Salts CBSE Questions & Answers

Class 7 · Acids Bases And Salts

This is Science Class 7 Acids Bases and Salts CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A common substance that contain acetic acid is
  • A
    Milk
  • B
    Turmeric
  • C
    Vinegar
    Correct
  • D
    Lemon
2
Fruit juice, such as orange juice contain
  • A
    Methenoic acid
  • B
    Citric acid
    Correct
  • C
    Oxalic acid
  • D
    Lactic acid
3
Which of the following present a base?
  • A
    \({\text{C}}{{\text{H}}_{\text{3}}}{\text{OH}}\)
    Correct
  • B
    KCl
  • C
    \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}}\)
  • D
    KOH
4
Acid reacts with base to form water and -----------.
  • A
    Milk of magnesia
  • B
    Coke
  • C
    Alkalies
  • D
    Salt
    Correct
5
Mixture of sodium hydrogen carbonate and tartaric acid used for making cake is
  • A
    Baking powder
    Correct
  • B
    Washing powder
  • C
    Baking soda
  • D
    Washing soda
6
Fats in our body contains
  • A
    Fatty acid
    Correct
  • B
    Nucleic acid
  • C
    Amino acid
  • D
    Acetic acid
7
Common name of dilute solution of acetic acid is
  • A
    Lime water
  • B
    Milk of magnesia
  • C
    Vinegar
    Correct
  • D
    Detergents
8
Chemical name of washing soda is
  • A
    Copper carbonate
  • B
    Calcium sulphate
  • C
    Sodium carbonate
    Correct
  • D
    Sodium bicarbonate
9
The indicator which give reddish pink colour with acid is
  • A
    Phenolphthalein
  • B
    Turmeric
  • C
    Methyl orange
    Correct
  • D
    Rose petals
10
Strength of acid depends upon
  • A
    Concentration of hydroxide ions
  • B
    Concentration of water
  • C
    Concentration of Hydrogen ions
    Correct
  • D
    Concentration of Oxygen ions
11
The obtained from plants and animals and can be consumed as food are called
  • A
    Inorganic acid
  • B
    Natural acid
  • C
    Organic acid
    Correct
  • D
    Mineral acid
12
All acids can not be tasted to know its taste because it may be
  • A
    Salty and harmful
  • B
    Sour and make mouth bitter
  • C
    Corrosive and cause harm
    Correct
  • D
    Bitter and soapy
13
Aerated drinks are slightly pungent in taste due to presence of
  • A
    Ascorbic acid
  • B
    Carbonic acid
    Correct
  • C
    Citric acid
  • D
    Formic acid
14
Dry HCl gas do not change the colour of dry litmus paper because
  • A
    Hydrogen gas is evolved only in presence of water
  • B
    Water provide acidic characters
  • C
    Hydrogen ion is produced in aqueous condition
    Correct
  • D
    Acids shows acidic property due to water
15
Rain water become acidic because of
  • A
    PbO and SnO
  • B
    KOH and \({\text{C}}{{\text{O}}_{\text{2}}}\)
  • C
    \({\text{N}}{{\text{O}}_{\text{2}}}\) and \({\text{S}}{{\text{O}}_{\text{2}}}\)
    Correct
  • D
    All of these