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s-Block Elements · Question 23

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air?

  1. Rb
  2. K
  3. Li
  4. Na

Answer

(3) Li

Solution

As per NCERT, on burning in air lithium forms mainly the monoxide, sodium forms the peroxide and K, Rb, Cs form superoxides:

4Li + O2 2Li2O (oxide)

2Na + O2 Na2O2 (peroxide)

M + O2 MO2 (superoxide; M = K, Rb, Cs)

The small Li+ ion has a strong polarising power and stabilises only the small oxide ion.

Answer: (3)

Out of syllabusAIPMT 2012 (Prelims)

Keep practising — s-Block Elements

2

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order :

  1. Li+ < K+ < Na+ < Rb+
  2. Rb+ < K+ < Na+ < Li+
  3. K+ < Na+ < Rb+ < Li+
  4. Na+ < Li+ < K+ < Rb+
Out of syllabusAIPMT 2012 (Prelims)
3

Which of the following statements is incorrect?

  1. Pure sodium metal dissolves in liquid ammonia to give blue solution.
  2. NaOH reacts with glass to give sodium silicate.
  3. Aluminium reacts with excess NaOH to give Al(OH)3.
  4. NaHCO3 on heating gives Na2CO3.
AIPMT 2011 (Mains)
4

Match List-I with List-II for the compositions of substances and select the correct answer using the codes given below.

  1. (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)
  2. (A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)
  3. (A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)
  4. (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)
Out of syllabusAIPMT 2011 (Mains)
5

Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

  1. CaOCl2
  2. Ca(OCl)2
  3. CaO2Cl
  4. CaCl2
Out of syllabusAIPMT 2011 (Prelims)
6

The compound A 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 which is recovered in the solid form. Solid C on gentle heating gives back A. The compound is

  1. CaCO3
  2. Na2CO3
  3. K2CO3
  4. CaSO4 2H2O
Out of syllabusAIPMT 2010 (Mains)
7

Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

  1. CaSO4
  2. BeSO4
  3. BaSO4
  4. SrSO4
Out of syllabusAIPMT 2010 (Prelims)
8

Property of the alkaline earth metals that increases with their atomic number

  1. solubility of their hydroxides in water
  2. solubility of their sulphates in water
  3. ionization energy
  4. electronegativity
Out of syllabusAIPMT 2010 (Prelims)
9

Which one of the following compounds is a peroxide?

  1. KO2
  2. BaO2
  3. MnO2
  4. NO2
Out of syllabusAIPMT 2010 (Prelims)
10

Which of the following oxides is not expected to react with sodium hydroxide?

  1. CaO
  2. SiO2
  3. BeO
  4. B2O3
Out of syllabusAIPMT 2009
11

The sequence of ionic mobility in aqueous solution is

  1. Rb+ > K+ > Cs+ > Na+
  2. Na+ > K+ > Rb+ > Cs+
  3. K+ > Na+ > Rb+ > Cs+
  4. Cs+ > Rb+ > K+ > Na+
Out of syllabusAIPMT 2008

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