Acid Bases And Salts CBSE Questions & Answers

Acid Bases And Salts

This is Science Class 10 Acid Bases and Salts CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Ayush and Ishoo were given one-one test tube, one of the test tube containing water and the other containing a solution of sodium hydroxide. They were asked to identify the test tube containing NaOH solution. Which one of the following can be used for correctly identifying the test tube containing the solution of NaOH?
  • A
    Blue litmus
  • B
    Dilute hydrochloric acid
  • C
    sodium carbonate solution
  • D
    Red litmus
    Correct
2
On reacting HCl to granulated zinc, the following observation is made
  • A
    dourer of chlorine is observed
  • B
    the reaction mixture twins milky
  • C
    the surface of the metal turns shining
  • D
    a colorless and odorless gas evolves with bubbles.
    Correct
3
zinc metal is amphoteric in nature because
  • A
    zinc reacts with NAOH only
  • B
    zinc reacts with HCl and NaOH both
    Correct
  • C
    zinc doesn’t react either with HCl and NaOH.
  • D
    zinc reacts with HCl only
4
On passing \({\rm{C}}{{\rm{O}}_{\rm{2}}}\) to time water for a longer time the milkiness disappears due to the
  • A
    formation of CaO
  • B
    formation of water soluble \({\rm{Ca }}{\left( {{\rm{HC}}{{\rm{O}}_{\rm{3}}}} \right)_{\rm{2}}}\)
    Correct
  • C
    formation of \({\rm{Ca}}{\left( {{\rm{OH}}} \right)_{\rm{2}}}\)
  • D
    formation of \({\rm{CaC}}{{\rm{O}}_{\rm{3}}}\)
5
When a few drops of phenolphthalein are added to a solution of NaOH, pink colour is produced what will be the colour of the final mixture when excess of HCl is added to it?
  • A
    Light pink
  • B
    orange
  • C
    colourless
    Correct
  • D
    Blue
6
A solution reacts with crushed- egg shells to give a gas that turns lime water milky. The solution contains-
  • A
    KCl
  • B
    HCl
    Correct
  • C
    LiCl
  • D
    NaCl
7
Honey bee sting has-
  • A
    None of these
  • B
    formic acid
    Correct
  • C
    acetic acid
  • D
    Butyric acid
8
Curd and other sour substances should not be kept in metallic container because
  • A
    All of these
  • B
    metal can react with acid present in the curd
    Correct
  • C
    Metal of the container dissolves in curd or other substances
  • D
    None of these
9
Alkali is-
  • A
    aqueous salt
  • B
    aqueous oxide
    Correct
  • C
    None of these.
  • D
    aqueous acidic oxide
10
Electrolysis of brine solution produces chlorine gas and sodium at
  • A
    Both at Anode
  • B
    Both at cathode
  • C
    Anode, cathode respectively
    Correct
  • D
    cathode anode respectively
11
A gas produced in the lab is highly soluble in water. Its colorless solution turns pink when a few drops of phenolphthalein is added to it. What is the nature of the gas
  • A
    Acidic
  • B
    Neutral
  • C
    Basic
    Correct
  • D
    Amphoteric
12
Statement A : Sulphuric acid is diprotic acid and phosphoric acid is triprotic acid. Statement B : chlor – alkali process is involved in the manufacturing of bleaching powder
  • A
    Statement A is true, B is false
  • B
    Neither statement A nor statement B is true
  • C
    Both statement A and B are true
    Correct
  • D
    Statement B is true, A is false
13
What happens when Sodium hydroxide reacts with sulphuric acid completely?
  • A
    Neutralisation reaction occur
  • B
    Neutral salt is formed
  • C
    All of these
    Correct
  • D
    \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\) and water are produced
14
Under what soil condition do you think a farmer would spread or treat the soil of his fields with quick lime (CaO) or slaked time \(\left( {{\rm{Ca C}}{{\rm{O}}_{\rm{3}}}} \right)\) ?
  • A
    All of these
  • B
    When the PH of the soil decreases
    Correct
  • C
    When the nutrients of the soil is lost
  • D
    When the PH of the soil increases
15
The PH of solution A is 6 and PH of solution B is 8. Which solution has more hydrogen ion concentration?
  • A
    Name of these
  • B
    Solution B
  • C
    same conc. in both A and B
  • D
    Solution A
    Correct