10th Standard CBSE - Science - Acids, Bases and Salts

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Question - 1

A solution turns red litmus blue; its pH is likely to be?

  • A 1
  • B 4
  • C 5
  • D 10

Question - 2

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.  The solution contains.

  • A NaCl
  • B HCl
  • C LiCl
  • D KCl

Question - 3

10 ml of a solution of NaOH is found to be completely neutralised by 8 ml of a given solution of HCl.  If we take 20 ml of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be 

  • A 4 ml
  • B 8 ml
  • C 12 ml
  • D 16 ml

Question - 4

Which one of the following type of medicines is used for treating indigestion?

  • A Antibiotic
  • B Analgesic
  • C Antacid
  • D Antiseptic

Question - 5

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(a) The temperature of the solution increases

(b) The temperature of the solution decreases

(c) The temperatures of the solution remains the same

(d) Salt formation takes place

  • A (i) only
  • B (i) and (iii)
  • C (ii) and (iii)
  • D (i) and (iv)

Question - 6

An aqueous solution turns red litmus solution blue.  Excess addition of which of the following solution would reverse the change?

  • A Baking powder
  • B Lime
  • C Ammonium hydroxide solution
  • D Hydrochloric acid

Question - 7

During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride.  The role of calcium chloride taken in the guard tube is to

  • A absorb the evolved gas
  • B moisten the gas
  • C absorb moisture from the gas
  • D absorb Cl-ions from the evolved gas

Question - 8

Which of the following salts does not contain water of crystallisation?

  • A Blue vitriol
  • B Baking soda
  • C Washing soda
  • D Gypsum

Question - 9

Sodium carbonate is a basic salt because it is a salt of

  • A Strong acid and strong base
  • B weak acid and weak base
  • C strong acid and weak base
  • D weak acid and strong base

Question - 10

Calcium phosphate is present in tooth enamel.  Its nature is

  • A basic
  • B acidic
  • C neutral
  • D amphoteric