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Science M.C.Q

acids, bases and salts · Gujarat Board (GSEB) STD 10 (GSEB - English Medium). 19 questions.

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19 questions · timed · auto-graded

MCQ 11 Mark
Which one of the following can be used as an acid-base indicator by a a visually impared student?
  • A
    Litmus
  • B
    Turmeric
  • ✓
    Vanilla essence
  • D
    Petunia leaves.
Answer
Correct option: C.
Vanilla essence
Vanilla essence
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MCQ 21 Mark
Which of the following substances will not give $CO _2$ on treatment with dilute acid ?
  • A
    Marble
  • B
    Limestone
  • C
    Baking soda
  • ✓
    Lime
Answer
Correct option: D.
Lime
Lime
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MCQ 31 Mark
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
  • ✓
    weak acid and strong base
Answer
Correct option: D.
weak acid and strong base
weak acid and strong base
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MCQ 41 Mark
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
  • ✓
    weak acid and strong base
Answer
Correct option: D.
weak acid and strong base
weak acid and strong base
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MCQ 51 Mark
Calcium phosphate is present in tooth enamel. Its nature is
  • ✓
    basic
  • B
    acidic
  • C
    neutral
  • D
    amphoteric
Answer
Correct option: A.
basic
basic
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MCQ 61 Mark
What happens when a solution of an acid is mixed with a solution of a base in test tube?
$(i)$ The temperature of the solution increases
$(ii)$ The temperature of the solution decreases
$(iii)$ The temperature of the solution remains the same.
$(iv)$ Salt formation takes place.
  • A
    only $(i)$
  • B
    $(i)$ and $(iii)$
  • C
    $(ii)$ and $(iii)$
  • ✓
    $(i)$ and $(iv)$
Answer
Correct option: D.
$(i)$ and $(iv)$
$(i)$ and $(iv)$
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MCQ 71 Mark
Which of the following substance does not produce carbon dioxide, when it is treated with dilute acid?
  • A
    Marble
  • B
    Lime stone
  • ✓
    Lime
  • D
    Baking soda
Answer
Correct option: C.
Lime
C. Lime
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MCQ 81 Mark
Which of the following aqueous solutions contains higher proportion of $OH-$ ions?
  • A
    $NaCl$
  • B
    $Na2SO4$
  • ✓
    $CH3COONa$
  • D
    Equal in all
Answer
Correct option: C.
$CH3COONa$
 $CH_3COONa$
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MCQ 91 Mark
The outer layer of the teeth is made-up of........
  • ✓
    Calcium phosphate
  • B
    Calcium nitrate
  • C
    Potassium phosphate
  • D
    Sodium phosphate
Answer
Correct option: A.
Calcium phosphate
A. Calcium phosphate
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MCQ 101 Mark
What will be the value of $pH$, if blue litmus paper turns red in aqueous solution?
  • ✓
    Between $0$ to $7$
  • B
    Between $7$ to $14$
  • C
    $14$
  • D
    $0$
Answer
Correct option: A.
Between $0$ to $7$
Between $0$ to $7$
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MCQ 111 Mark
Which of the following solutions is neutral?
  • A
    Juice of citrus fruits
  • B
    Lemon juice
  • ✓
    Solution of washing soda
  • D
    An aqueous solution of salt - $NaCl$
Answer
Correct option: C.
Solution of washing soda
C. Solution of washing soda
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MCQ 121 Mark
The $pH$ values of aqueous solutions $A, B, C$ and $D$ are $1.9, 2.5, 2.1$ and $3.0$ respectively; then what will be the correct order of their acidic strength?
  • A
    $A< C< B< D$
  • B
    $D< C< B< A$
  • ✓
    $D< B< C< A$
  • D
    $D> C> B> A$
Answer
Correct option: C.
$D< B< C< A$
$D< B< C< A$
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MCQ 131 Mark
Which of the following is a strong acid?
  • A
    Acetic acid
  • B
    Citric acid
  • C
    Oxalic acid
  • ✓
    Nitric acid
Answer
Correct option: D.
Nitric acid
D. Nitric acid
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MCQ 141 Mark
What is the $pH$ value of an aqueous solution of $NH4Cl?$
  • A
    $pH = 7$
  • B
    $pH> 7$
  • ✓
    $pH< 7$
  • D
    $pH = 0$
Answer
Correct option: C.
$pH< 7$
$pH< 7$
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MCQ 151 Mark
Which of the following solution is most basic?
  • A
    $pH = 8.2$
  • B
    $pH = 9.3$
  • ✓
    $pH = 11.5$
  • D
    $pH = 10.6$
Answer
Correct option: C.
$pH = 11.5$
$ pH = 11.5$
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MCQ 161 Mark
Which of the following pair is not appropriate?
  • A
    Citrus fruits-citric acid
  • B
    Curd-lactic acid
  • C
    Sting of red ant - methanoic acid
  • ✓
    Tomatoes - tartaric acid
Answer
Correct option: D.
Tomatoes - tartaric acid
D. Tomatoes - tartaric acid
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MCQ 171 Mark
$CaCl2 + X → CaSO4 + 2NaCl$, what is $X?$
  • ✓
    $Na2SO4$
  • B
    $CaSO3$
  • C
    $Na2SO3$
  • D
    $CaSO2$
Answer
Correct option: A.
$Na2SO4$
A. $Na_2SO_4$
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MCQ 181 Mark
The $pH$ of aqueous solution $(s)$ of which salt is $7?$
  • A
    $Na2CO3$
  • B
    $CH3COONa$
  • C
    $NH4Cl$
  • ✓
    $KNO3$
Answer
Correct option: D.
$KNO3$
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MCQ 191 Mark
When does tooth decay occur?
  • ✓
    When the pH of inner part of mouth is lower than $5.5.$
  • B
    When the pH of inner part of mouth is higher than $5.5.$
  • C
    When the pH of inner part of mouth is $5.5.$
  • D
    When the pH of inner part of mouth is $7.0.$
Answer
Correct option: A.
When the pH of inner part of mouth is lower than $5.5.$
A. When the pH of inner part of mouth is lower than $5.5.$
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