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
Which gas is released when lime water reacts with sulphuric acid?
  • A
    Carbon mono oxide
  • B
    No gas is evolved
  • C
    Sulpher dioxide
  • D
    Carbon dioxide
    Correct
2
Antacid is used to treat
  • A
    Indigestion
    Correct
  • B
    Malaria
  • C
    Head ache
  • D
    Common cold
3
Milk of magnesia contain
  • A
    Magnesium hydroxide
    Correct
  • B
    Calcium hydroxide
  • C
    Magnesium chloride
  • D
    Sodium hydroxide
4
A solution of NaCl turns
  • A
    pH paper orange
  • B
    Red litmus blue
  • C
    pH paper green
    Correct
  • D
    Blue litmus red
5
Egg shell is made up of
  • A
    Calcium carbonate
    Correct
  • B
    Calcium chloride
  • C
    Calcium hydroxide
  • D
    Calcium oxide
6
Curd should be stored in
  • A
    Copper vessels
  • B
    Steel vessels
  • C
    Bronze vessels
  • D
    Glass vessels
    Correct
7
Sodium carbonate is a basic salt because it is salt of
  • A
    Weak acid and weak base
  • B
    Weak acid and strong base
    Correct
  • C
    Strong acid and weak base
  • D
    Strong acid and strong base
8
One of the constituent of baking powder is baking powder and other is
  • A
    Lactic acid
  • B
    Sulphuric acid
  • C
    Carboxylic acid
  • D
    Tartaric acid
    Correct
9
Tooth pastes are generally ------------- in nature.
  • A
    Neutral
  • B
    Acidic
  • C
    Salty
  • D
    Basic
    Correct
10
Which of the following is a olfactory indicators?
  • A
    Litmus paper
  • B
    Vanilla
    Correct
  • C
    Rose petals
  • D
    Methyl orange
11
Which of the following is acidic in nature?
  • A
    Lime water
  • B
    Human blood
  • C
    Lime juice
    Correct
  • D
    Milk
12
Which of the following statement is true about the acid?
  • A
    Sour in taste and turns blue litmus red
    Correct
  • B
    Sour in taste and turns red litmus blue
  • C
    Bitter in taste and turns blue litmus red
  • D
    Bitter in taste and turns red litmus blue
13
Tartaric acid is used in baking powder to remove
  • A
    Bitterness due to sodium carbonate
    Correct
  • B
    Bitterness due to calcium carbonate
  • C
    Sourness due to sodium carbonate
  • D
    Bitterness due to calcium carbonate
14
Soda acid fire extinguisher extinguish the fire by
  • A
    Increasing the ignition temperature
  • B
    Removing the combustible substance
  • C
    Cutting the supply of oxygen
    Correct
  • D
    Reducing the temperature
15
Which of the following gas is evolved when baking soda reacts with acids?
  • A
    \({\text{C}}{{\text{l}}_{\text{2}}}\)
  • B
    \({\text{C}}{{\text{O}}_{\text{2}}}\)
    Correct
  • C
    \({\text{N}}{{\text{O}}_{\text{2}}}\)
  • D
    \({{\text{H}}_{\text{2}}}\)