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11th Standard Chemistry Alkali and Alkaline Earth Metals English Medium Free Online Test One Mark Questions 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. 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. sodium is stored in

    (a)

    alcohol

    (b)

    water

    (c)

    kerosene

    (d)

    none of these

  3. Find the wrong statement

    (a)

    sodium metal is used in organic qualitative analysis

    (b)

    sodium carbonate is soluble in water and it is used in inorganic qualitative analysis

    (c)

    potassium carbonate can be prepared by solvay process

    (d)

    potassium bicarbonate is acidic salt

  4. In case of alkali metal halides, the ionic character increases in the order

    (a)

    MF < MCI < MBr < MI

    (b)

    MI < MBr < MCI < MF

    (c)

    MI < MBr<MF < MCI

    (d)

    none of these

  5. The product obtained as a result of a reaction of nitrogen with CaC2 is

    (a)

    Ca(CN)3

    (b)

    CaN2

    (c)

    CaCN2

    (d)

    Ca3N2

  6. Match the flame colours of the alkali and alkaline earth metal salts in the bunsen burner

    (P) Sodium (1) Brick red
    (q) Calcium (2) Yellow
    (r) Barium (3) Violet
    (s) Strontium (4) Apple green
    (t) Cesium (5) Crimsonred
    (u) Potassium (6) Blue
    (a)

    p-2, q-1, r-4, s-5, t-6, u-3

    (b)

    p-1, q-2, r-4, s-5, t-6, u-3

    (c)

    p-4, q-1, r-2, s-3, t-5, u-6

    (d)

    p-6, q-1, r-2, s-3, t-5, u-4

  7. Assertion : BeSO4 is soluble in water while BaSO4 is not
    Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

    (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.

  8. Spodumene is the silicate mineral of _____

    (a)

    lithium

    (b)

    sodium

    (c)

    cesium

    (d)

    francium

  9. Which among the following is the strongest reducing agent?

    (a)

    Na

    (b)

    K

    (c)

    Ac

    (d)

    Mg

  10. The metallic lusture exhibited by sodium is due to,

    (a)

    Excitation of free protons

    (b)

    Existence of body centered cubic lattice

    (c)

    Diffusion of Na+ ions.

    (d)

    Vibration of loose electrons

  11. Assertion : Lithium is in diagonal relationship with magnesium
    Reason : Li+ has same size as Mg2

    (a)

    Both assertion and reason are true and reason is the correct explanation for assertion.

    (b)

    Both assertion and reason are true but reason is not the correct explanation for assertion

    (c)

    Assertion is true but reason are false

    (d)

    Both assertion and reason are false.

  12. Find out the correct statement with respect to alkali metals.

    (a)

    They react with oxygen to give mainly the oxide MO2

    (b)

    They react with halogen to give halides MX

    (c)

    Their nitrates decompose on heating to give NO2 and O2

    (d)

    Their carbonates decompose on heating to give CO2 and MO

  13. Match the list I with List II and select the correct answer using. the code given below the lists.

    List I List II
    A Ba 1 Crimson red
    B Ca 2 Lilac
    C Sr 3 Apple green
    D K 4 Brick red
    (a)
    A B C D
    1 3 2 4
    (b)
    A B C D
    4 3 1 2
    (c)
    A B C D
    3 4 1 2
    (d)
    A B C D
    2 1 4 3
  14. _______ is unstable in air and is kept in CO2 atmosphere to avoid decomposition.

    (a)

    BeCO3

    (b)

    MgCO3

    (c)

    CaCO3

    (d)

    BaCO3

  15. _________ is the cofactor of all enzymes that utilize ATP in phosphate transfer and energy release.

    (a)

    Be

    (b)

    Mg

    (c)

    Ca

    (d)

    Ba

  16. What is the trend of formation of ionic compound in alkaline earth metals?

    (a)

    Increases down the group

    (b)

    Decreases down the group

    (c)

    Decreases across the period

    (d)

    Remains same in the periodic table

  17. Assertion : Alkaline earth metals are harder than alkali metals
    Reason : Atomic radii of alkaline earth metals are smaller than corresponding alkali metals "in the same periods of periodic table

    (a)

    Both assertion and reason are true and reason is the correct explanation for assertion.

    (b)

    Both assertion and reason are true but reason is not the correct explanation for assertion

    (c)

    Assertion is true but reason are false

    (d)

    Both assertion and reason are false

  18. Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metals salts due to :

    (a)

    their increased covalent character

    (b)

    high lattice energy

    (c)

    their high ionization energy

    (d)

    none of the above

  19. Ca(OH)2 is _______

    (a)

    gypsum

    (b)

    milk of lime

    (c)

    slaked lime

    (d)

    lime water

  20. Lime water turning milky is due to the formation of ______

    (a)

    calcium carbonate

    (b)

    calcium hydroxide

    (c)

    calcium hydroxide

    (d)

    calcium chloride

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