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 element is common in all acids?
  • A
    Oxygen
  • B
    Hydrogen
    Correct
  • C
    Nitrogen
  • D
    Carbon
2
Distilled water is
  • A
    Salty
  • B
    Basic
  • C
    Neutral
    Correct
  • D
    Acidic
3
Which of the following is not a strong acid?
  • A
    Sulphuric acid
  • B
    Nitric acid
  • C
    Hydrochloric acid
  • D
    Acetic acid
    Correct
4
Which one is not a feature of acids?
  • A
    Bitter
    Correct
  • B
    Turn blue litmus red
  • C
    Sour
  • D
    Corrosive
5
The acid released in stomach is
  • A
    Sulphuric acid
  • B
    Citric acid
  • C
    Hydrochloric acid
    Correct
  • D
    Lactic acid
6
What is the chemical name of baking soda?
  • A
    Copper sulphate
  • B
    Sodium carbonate
  • C
    Sodium chloride
  • D
    Sodium hydrogen carbonate
    Correct
7
Oxalic acid is present in
  • A
    Tomato
  • B
    Spinach
    Correct
  • C
    Orange
  • D
    Apple
8
The base present in soap is/are
  • A
    Sodium hydroxide and calcium hydroxide
  • B
    All of these
  • C
    Potassium hydroxide and sodium chloride
  • D
    Sodium hydroxide/ potassium hydroxide
    Correct
9
A solution that do not change the colour of litmus blue/red are called
  • A
    Neutral substance
    Correct
  • B
    Basic substance
  • C
    Acidic substance
  • D
    Alkaline substance
10
Turmeric stain on white shirt turn red when washed with soap because
  • A
    Turmeric is acidic in nature
  • B
    Soap is acidic in nature
  • C
    Soap is neutral in nature
  • D
    Soap is basic in nature
    Correct
11
China rose indicator turn acidic solution to dark pink and basic solution to
  • A
    Blue
  • B
    Green
    Correct
  • C
    Magenta
  • D
    Orange
12
Rain containing excess of water is called
  • A
    Light rain
  • B
    Yellow rain
  • C
    Acid rain
    Correct
  • D
    Dark rain
13
Acid + blue litmus = red colour + base =?
  • A
    Pink
  • B
    Brown
  • C
    Reddish brown
  • D
    Colourless
    Correct
14
In neutralisation reaction, a new substance is formed called
  • A
    Milk of magnesia
  • B
    Salt
    Correct
  • C
    Bleaching powder
  • D
    Soda
15
\({\text{HCl }} + {\text{ NaOH}} \to {\text{NaCl }} + {\text{ }}?\)
  • A
    \({{\text{H}}_{\text{2}}}{\text{O}}\)
    Correct
  • B
    NaH
  • C
    NaO
  • D
    \({\text{C}}{{\text{O}}_{\text{2}}}\)