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11th Standard Chemistry Alkali and Alkaline Earth Metals English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

    (a)

    ethanoic acid

    (b)

    ethanol

    (c)

    phenol

    (d)

    none of these

  2. In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

    (a)

    Castner's process

    (b)

    Cyanide process

    (c)

    Down process

    (d)

    All of these

  3. Assertion Generally alkali and alkaline earth metals form superoxides
    Reason There is a single bond between O and 0 in superoxides

    (a)

    both assertion and reason are true and reason 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

  4. Which is the correct sequence of solubility of  carbonates of alkaline earth metals?

    (a)

    BaCO3 > SrCO3 > CaCO3 > MgCO3

    (b)

    MgCO3 > CaCO3 > SrCO3 > BaCO3

    (c)

    CaCO3 > BaCO3 > SrCO3 > BaCO3

    (d)

    BaCO3 > CaCO3 > SrCO3 > MaCO3

  5. The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO2 is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is

    (a)

    CaCO3

    (b)

    Ca(OH)2

    (c)

    Na2CO3

    (d)

    NaHCO3

  6. Electronic configuration of 1s block of elements is ______

    (a)

    ns2

    (b)

    ns1

    (c)

    ns2np1

    (d)

    ns2np2

  7. The hydration enthalpies of alkali metal ions decreases in ______ order.

    (a)

    Li+ > Na+ > K+ > Rb+ > Cs+

    (b)

    Cs+ > Rb+ > K+ > Na+ > Li+​​​​​​​

    (c)

    Li+ > Rb+ > K+ > Na+ > Cs+​​​​​​​

    (d)

    Rb+ > Cs+ > K+ > Na+ > Li+

  8. The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution

    (a)

    Sublimation enthalpy

    (b)

    Ionisation enthalpy

    (c)

    Hydration enthalpy

    (d)

    Electron-gain enthalpy

  9. Which of the following is used in photoelectric cells?

    (a)

    Na

    (b)

    K

    (c)

    Li

    (d)

    Cs

  10. ________ is responsible for the transmission of nerve signals.

    (a)

    Lithium

    (b)

    Sodium

    (c)

    Potassium

    (d)

    Magnesium

  11. Which of the following metals is most commonly used in photochemical cells?

    (a)

    Lithium

    (b)

    Calcium

    (c)

    Caesium

    (d)

    Francium

  12. Why Cs and K are used as electrodes in photoelectric cells

    (a)

    Due to their less ionisation energy

    (b)

    Due to high ionisation energy

    (c)

    Due to diagonal relationship

    (d)

    None of these

  13. Which among the following alkali metals exhibit the most metallic character?

    (a)

    Na

    (b)

    Li

    (c)

    Cs

    (d)

    K

  14. ________ occurs in large amounts in sea water

    (a)

    NaCI

    (b)

    KCI

    (c)

    both a and b

    (d)

    neither a nor b

  15. Identify the most stable hydride among the following

    (a)

    NaH

    (b)

    LiH

    (c)

    KH

    (d)

    CsH

  16. Which of the following halides has the highest melting point?

    (a)

    NaF

    (b)

    NaCI

    (c)

    NaBr

    (d)

    NaI

  17. Electronic configuration of 2s block of elements is

    (a)

    ns2

    (b)

    ns1

    (c)

    ns2np1

    (d)

    ns2np2

  18. Several blocks of magnesium are fixed to the bottom of a ship to

    (a)

    Keep away the sharks

    (b)

    prevent of rusting of iron ships

    (c)

    make the ship lighter

    (d)

    prevent puncturing by under sea rocks

  19. Which of the following dissolves in water with a hissing sound?

    (a)

    bleaching powder

    (b)

    marble

    (c)

    quick lime

    (d)

    slaked lime

  20. Sodium react with water more vigorously than lithium because:

    (a)

    it has higher atomic mass

    (b)

    it is more electropositive

    (c)

    it is more electronegative

    (d)

    it is a metal.

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