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
Acid present in cold drinks (soft drinks) is
  • A
    Citric acid
  • B
    Tartaric acid
  • C
    Carbonic acid
    Correct
  • D
    Sulphuric acid
2
Which of the following is not a indicator?
  • A
    Litmus
  • B
    Sodium chloride
    Correct
  • C
    Methyl orange
  • D
    Phenolphthalein
3
Water soluble bases are called
  • A
    Aldehydic
  • B
    Basic
  • C
    Alkalies
    Correct
  • D
    Neutral
4
Turmeric stains turns into ___________ when washed with soap.
  • A
    Red
    Correct
  • B
    Green
  • C
    Blue
  • D
    Orange
5
All acids produce _______________ ions in presence of water.
  • A
    \({{\text{H}}^ + }\)
    Correct
  • B
    \({\text{N}}{{\text{a}}^ + }\)
  • C
    \({\text{C}}{{\text{l}}^--}\)
  • D
    \({\text{O}}{{\text{H}}^ - }\)
6
The reaction in which an acid react with a base to form salt and water is called as
  • A
    Neutralisation reaction
    Correct
  • B
    Addition reaction
  • C
    Displacement reaction
  • D
    Substitution reaction
7
Which of the following in not a natural indicator?
  • A
    Turmeric
  • B
    Phenolphthalein
    Correct
  • C
    Litmus
  • D
    Rose petals
8
Vitamin C is the another name of
  • A
    Ascorbic acid
    Correct
  • B
    Citric acid
  • C
    Tartaric acid
  • D
    Acetic acid
9
Organic acids are obtained from
  • A
    Neither plants nor animals
  • B
    Plants and animals
    Correct
  • C
    Only plants
  • D
    Only animals
10
Metal oxides react with water to form
  • A
    Bases
    Correct
  • B
    Salts
  • C
    Minerals
  • D
    Acids
11
The word acid comes from Latin word “acere” which means
  • A
    Salty
  • B
    Sweet
  • C
    Sour
    Correct
  • D
    Bitter
12
Dry HCl gas do not change the colour of dry litmus paper because
  • A
    Water provide acidic characters
  • B
    Acids shows acidic property due to water
  • C
    Hydrogen gas is evolved only in presence of water
  • D
    Hydrogen ion is produced in aqueous condition
    Correct
13
Acids
  • A
    Turn blue litmus red
    Correct
  • B
    Develops brown colour with methyl orange
  • C
    Develops pink colour with methyl orange
  • D
    Red litmus blue
14
The found in bites and strings of insect is
  • A
    Formic acid
    Correct
  • B
    Citric acid
  • C
    Lactic acid
  • D
    Tartaric acid
15
Which of the following is not a salt?
  • A
    Magnesium sulphate
  • B
    Sodium chloride
  • C
    Sodium sulphate
  • D
    Potassium hydroxide
    Correct