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Chemistry M.C.Q (1 Marks)

PART - 1 CH - 1 Some Basic Concepts of Chemistry · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 22 questions.

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M.C.Q (1 Marks)

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22 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The number of electrons present in $0.142 gm Cl { }_2$ is :
  • A
    $4.095 \times 10^{23}$
  • B
    $4.095 \times 10^{24}$
  • C
    $4.095 \times 10^{29}$
  • ✓
    $4.095 \times 10^{22}$
Answer
Correct option: D.
$4.095 \times 10^{22}$
D
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MCQ 21 Mark
4 moles of A and 9 moles B react with each other according to following equation: A+2B$\rightarrow$ C then how many moles of C will form?
  • A
    10
  • B
    5
  • ✓
    4
  • D
    8
Answer
Correct option: C.
4
C
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MCQ 31 Mark
What will be the atomic mass of an element having specific heat 0.16?
  • A
    16
  • B
    32
  • ✓
    40
  • D
    20
Answer
Correct option: C.
40
C
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MCQ 81 Mark
At STP is 1 ml of ideal gas the number of molecules is:
  • A
    $6.022 \times 10^{23}$
  • ✓
    $2.69 \times 10^{19}$
  • C
    $2.69 \times 10^{23}$
  • D
    None of these
Answer
Correct option: B.
$2.69 \times 10^{19}$
B
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MCQ 91 Mark
Which of the following has minimum weight?
  • A
    2 gm atom of Nitrogen
  • ✓
    $3.011 \times 10^{23}$ atom of Carbon
  • C
    1 mole of Sulphur
  • D
    7.0 gm of Silver
Answer
Correct option: B.
$3.011 \times 10^{23}$ atom of Carbon
B
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MCQ 101 Mark
At room temperature in one draw of water (volume 0.0018 ml) what will be the number of water molecules:
  • ✓
    $6.022 \times 10^{19}$
  • B
    $4.84 \times 10^{17}$
  • C
    $6.022 \times 10^{23}$
  • D
    $1.084 \times 10^{18}$
Answer
Correct option: A.
$6.022 \times 10^{19}$
A
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MCQ 111 Mark
Which of the following have maximum number of atoms?
  • A
    $6.022 \times 10^{21}$ molecules of $CO _2$
  • ✓
    22.4 lit of $CO _2$ at NTP
  • C
    0.44 gm of $CO _2$
  • D
    All of above are same
Answer
Correct option: B.
22.4 lit of $CO _2$ at NTP
B
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MCQ 121 Mark
In mole of C2H6.__________ are present:
  • A
    $6.022 \times 10^{23}$ atom of hydrogen
  • ✓
    6 gm atom of hydrogen
  • C
    $1.806 \times 10^{23}$ molecules of $C _2 H _6$
  • D
    6 gm of carbon
Answer
Correct option: B.
6 gm atom of hydrogen
B
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MCQ 141 Mark
Air is a:
  • A
    Compound
  • ✓
    Homogenous mixture
  • C
    Heterogenous mixture
  • D
    Element
Answer
Correct option: B.
Homogenous mixture
B
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MCQ 151 Mark
Which of the following unit of concentration do not depend on temperature?
  • A
    Molality
  • ✓
    Molarity
  • C
    Mole fraction
  • D
    Mass %
Answer
Correct option: B.
Molarity
B
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MCQ 161 Mark
What will be the molarity of solution of 4 gm NaOH in 250 ml solution?
  • A
    0.2 M
  • ✓
    0.4 M
  • C
    0.8 M
  • D
    0.1 M
Answer
Correct option: B.
0.4 M
B
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MCQ 181 Mark
What will be number of electrons in 1 kg electron?
  • A
    $6.022 \times 10^{23}$
  • ✓
    $\frac{10^{31}}{9.1}$
  • C
    $\frac{6.029}{91} \times 10^{54}$
  • D
    $\frac{1 \times 10^8}{9.1 \times 6.022}$
Answer
Correct option: B.
$\frac{10^{31}}{9.1}$
B
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