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S-Block Elements Chemistry

Questions covering the chemistry of alkali and alkaline earth metals, including properties, reactivity, extraction methods, ionization energies, and compound formation

20 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Metallic luster exhibited by metallic sodium is explained by

  1. diffusion of sodium ions
  2. oscillation of bonding electrons
  3. excitation of protons
  4. existance of body centred cubic lattice
Question 2 Multiple Choice (Single Answer)

Characteristic property of alkali metals is

  1. they are good reducing agents
  2. they are good oxidising agent
  3. electropositive character decreases down the group
  4. high ionisation potential
Question 3 Multiple Choice (Single Answer)

Which process is used in the exaction of magnesium?

  1. Electrolysis of fused salts
  2. Electrolysts of aqueous solution
  3. Thermite process
  4. Smelting in a blast furnace
Question 4 Multiple Choice (Single Answer)

The correct order of reactivity of the following metals is

  1. Cu > Zn > K > Al
  2. K > Al > Zn > Cu
  3. Zn > Cu > Al > K
  4. K > Zn > Al > Cu
Question 5 Multiple Choice (Single Answer)

Assertion (A) Fr burns in air forming FrO2-Reason (R) The larger alkali metal ions stabilise FrO2-(superoxide).

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 6 Multiple Choice (Single Answer)

Assertion (A) K2CO3 cannot be prepared by Solvay process. Reason (R) KHCO3 being fairly soluble in water does not precipitate in carbonation tower.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 7 Multiple Choice (Single Answer)

Which one of the following property is not applicable to first group elements?

  1. crystallisation in body centred cubic lattice
  2. low ionisation energy
  3. low electronegativity
  4. low atomic volume
Question 8 Multiple Choice (Single Answer)

Which among the following will give a compound having the highest percentage ionic character. Electronegativity values of Na, K,Cl and Br are 0.9, 0.8, 3.0 and 2.8 respectively

  1. K, Cl
  2. Na, Cl
  3. K, Br
  4. Na, Br
Question 9 Multiple Choice (Single Answer)

Which configuration indicates elements with very high second ionisation potential?

  1. ns2
  2. ns1
  3. ns2 np5
  4. ns2 np6
Question 10 Multiple Choice (Single Answer)

Assertion (A) Alkali metals form solid bicarbonates. Reason (R) LiHCO3 exists in aqueous solution.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 11 Multiple Choice (Single Answer)

Assertion (A) The metals of group 2 (except Be) from ionic compounds.Reason (R) Electropositive character and the reducing property increase on moving down the group.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 12 Multiple Choice (Single Answer)

Li does not resemble other alkali metals due to

  1. small size of Li+ ion
  2. high polarising power
  3. high ionisation energy and low electropositive nature
  4. all the above
Question 13 Multiple Choice (Single Answer)

Assertion (A) Li is used in photocells.Reason (R) Cs has lower ionisation energy than Li.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 14 Multiple Choice (Single Answer)

The oxide of an element with its outermost shell electronic configuration of ns1 and ns2 with no d electron in the penaltimate shell has

  1. basic character
  2. neutral characteric
  3. amphoteric nature
  4. acidic character
Question 15 Multiple Choice (Single Answer)

Assertion (A) The superoxide MO2 contains the paramagnetic ion O-2. Reason (R)O-2 is stable in presence of large cations as K, Rb, Cs.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 16 Multiple Choice (Single Answer)

The metal which cannot displace hydrogen from water is

  1. sodium
  2. zinc
  3. magnesium
  4. copper
Question 17 Multiple Choice (Single Answer)

Abnormal decrease in the ionisation energy from Na to K is due to

  1. sudden increase in the electro negativity value
  2. abnormal rise in the size of the potassium atom
  3. presence of body centred cubic lattice for alkali metals
  4. none of these
Question 18 Multiple Choice (Single Answer)

Compunds of alkaline earth metal salts have less solubility than alkali metal salts.This is due to

  1. alkaline earth metals are covalent in character
  2. alkaline earth metals are basic
  3. higher lattice energy for alkaline earth metal salts
  4. higher lattice energy for alkali metals salt
Question 19 Multiple Choice (Single Answer)

The presence of a lone electron in the valence shell of alkali metals account for

  1. low ionisation potential
  2. weak metallic bond
  3. low melting points
  4. all the above
Question 20 Multiple Choice (Single Answer)

Assertion (A) Among the alkali metals, lithium salts exhibit the least electrical condutance in aqueous solutions.Reason (R) Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
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