Alkali and Alkaline Earth Metals One Mark Questions

11th Standard

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Chemistry

Time : 00:30:00 Hrs
Total Marks : 10
    10 x 1 = 10
  1. For alkali metals, which one of the following trends is incorrect?

    (a)

    Hydration energy: Li > Na > K > Rb

    (b)

    Ionisation energy: Li > Na > K > Rb

    (c)

    Density: Li < Na < K < Rb

    (d)

    Atomic size: Li < Na < K < Rb

  2. Which of the following statements is in correct?

    (a)

    Li+ has minimum degree of hydration among alkali metal cations

    (b)

    The oxidation state of K in KO2 is +1

    (c)

    Sodium is used to make Na / Pb alloy

    (d)

    MgSO4 is readily soluble in water

  3. 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

  4. The radioactive element of group 1 is ______

    (a)

    rubidium

    (b)

    cesium

    (c)

    francium

    (d)

    radium

  5. Half life of francium is _______

    (a)

    12.3 years

    (b)

    12.3 mins

    (c)

    21 years

    (d)

    21 mins

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

    (a)

    ns2

    (b)

    ns1

    (c)

    ns2np1

    (d)

    ns2np2

  7. The atomic and ionic radii of alkali metals ________ on moving down the group

    (a)

    increases

    (b)

    decreases

    (c)

    does not vary

    (d)

    decreases and then increases

  8. 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+

  9. The most electro positive element of the periodic table is _________

    (a)

    Gold

    (b)

    Platinum

    (c)

    Cesium

    (d)

    Calcium

  10. Alkali elements exhibit an oxidation state of ________

    (a)

    +1

    (b)

    +2

    (c)

    +3

    (d)

    +4

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