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11th Standard English Medium Chemistry Subject Book Back 1 Mark Questions with Solution Part - I

11th Standard

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Chemistry

Time : 00:30:00 Hrs
Total Marks : 15

    Part I

    15 x 1 = 15
  1. Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
    Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022
    (a) both assertion and reason are true and the reason is the correct explanation of assertion
    (b) both assertion and reason are true but reason is not the correct explanation of assertion
    (c) assertion is true but reason is false
    (d) both assertion and reason are false

    (a)

    both assertion and reason are true and the reason is the correct explanation of assertion

    (b)

    both assertion and reason are true but the reason is not the correct explanation of assertion

    (c)

    an assertion is true but reason is false

    (d)

    both assertion and reason are false

  2. According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

    (a)

    n = 6 to n = 1

    (b)

    n = 5 to n = 4

    (c)

    n = 5 to n = 3

    (d)

    n = 6 to n = 5

  3. Which of the following elements will have the highest electro negativity ____________

    (a)

    Chlorine

    (b)

    Nitrogen

    (c)

    Cesium

    (d)

    Fluorine

  4. Ionic hydrides are formed by _____________

    (a)

    halogens

    (b)

    chalogens

    (c)

    inert gases

    (d)

    group one elements

  5. RbO2 is _____________

    (a)

    superoxide and paramagnetic

    (b)

    peroxide and diamagnetic

    (c)

    superoxide and diamagnetic

    (d)

    peroxide and paramagnetic

  6. Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

    (a)

    at high pressure the collision between the gas molecule become enormous

    (b)

    at high pressure the gas molecules move only in one direction

    (c)

    at high pressure, the volume of gas become insignificant

    (d)

    at high pressure the intermolecular interactions become significant

  7. An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is ______________

    (a)

    - 900 J

    (b)

    900 kJ

    (c)

    270 kJ

    (d)

    -900 kJ

  8. K1 and K2 are the equilibrium constants for the reactions respectively.
    \({ N }_{ 2 }(g)+{ O }_{ 2 }(g)\overset { { K }_{ 1 } }{ \rightleftharpoons } 2NO(g)\)
    \(2NO(g)+{ O }_{ 2 }(g)\overset { { K }_{ 2 } }{ \rightleftharpoons } { 2NO }_{ 2 }(g)\)
    What is the equilibrium constant for the reaction NO2(g) ⇌ ½N2(g) + O2(g)

    (a)

    \({1\over \sqrt{K_1K_2}}\)

    (b)

    (K1 = K2)1/2

    (c)

    \({1\over 2K_1K_2}\)

    (d)

    \(({1\over K_1K_2})^{3/2}\)

  9. Stomach acid, a dilute solution of HCl can be neutralised by reaction with Aluminium hydroxide
    Al (OH)3 + 3HCl (aq) → AlCl3 + 3 H2O
    How many millilitres of 0.1 M Al(OH)3 solution are needed to neutralise 21 mL of 0.1 M HCl ?

    (a)

    14 mL

    (b)

    7 mL

    (c)

    21 mL

    (d)

    none of these

  10. Assertion: Oxygen molecule is paramagnetic.
    Reason: It has two unpaired electron in its bonding molecular orbital.
    a) both assertion and reason are true and reason is the correct explanation of assertion
    b) both assertion and reason are true but reason is not the correct explanation of assertion
    c) assertion is true but reason is false
    d) Both assertion and reason are false

    (a)

    both assertion and reason are true and reason is the correct explanation of assertion

    (b)

    both assertion and reason are true but reason is not the correct explanation of assertion

    (c)

    assertion is true but reason is false

    (d)

    Both assertion and reason are false

  11. In the hydrocarbo \(\overset { 7 }{ { CH }_{ 3 } } -\overset { 6 }{ { CH }_{ 2 } } -\overset { 5 }{ CH } =\overset { 4 }{ CH } -\overset { 3 }{ { CH }_{ 2 } } -\overset { 2 }{ C } =\overset { 1 }{ CH } \) the state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

    (a)

    sp, sp, sp3, sp2, sp3

    (b)

    sp2, sp, sp3, sp2, sp3

    (c)

    sp, sp, sp2, sp, sp3

    (d)

    none of these

  12. What is the hybridisation state of benzyl carbonium ion ?

    (a)

    sp2

    (b)

    spd2

    (c)

    sp3

    (d)

    sp2d

  13. \({ C }_{ 2 }{ H }_{ 5 }Br+2Na\overset { dry\quad ether }{ \longrightarrow } { C }_{ 4 }{ H }_{ 10 }+2NaBr\) The above reaction is an example of which of the following

    (a)

    Reimer Tiemann reaction

    (b)

    Wurtz reaction

    (c)

    Aldol condensation

    (d)

    Hoffmann reaction

  14. Of the following compounds, which has the highest boiling point?

    (a)

    n-Butyl chloride

    (b)

    Isobutyl chloride

    (c)

    t-Butyl chloride

    (d)

    n-propyl chloride

  15. Identify the wrong statement in the following __________.

    (a)

    The clean water would have a BOD value of more than 5 ppm

    (b)

    Greenhouse effect is also called as Global warming

    (c)

    Minute solid particles in air is known as particulate pollutants

    (d)

    Biosphere is the protective blanket of gases surrounding the earth

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