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s-Block Elements · Question 25

AIPMT 2011 (Mains)MCQEasy📈 Topic in 0% papers+4−1
1

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.

Answer

(3) Aluminium reacts with excess NaOH to give Al(OH)3.

Solution

(1) Correct: alkali metals dissolve in liquid ammonia giving a blue solution due to ammoniated electrons.

(2) Correct: 2NaOH + SiO2 Na2SiO3 + H2O

(3) Incorrect: with excess NaOH, aluminium forms soluble sodium tetrahydroxoaluminate(III), not Al(OH)3:

2Al + 2NaOH + 6H2O 2Na+[Al(OH)4]- + 3H2

(4) Correct: 2NaHCO3 Na2CO3 + H2O + CO2

Answer: (3)

AIPMT 2011 (Mains)

Keep practising — s-Block Elements

2

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)
3

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)
4

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)
5

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)
6

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)
7

Which one of the following compounds is a peroxide?

  1. KO2
  2. BaO2
  3. MnO2
  4. NO2
Out of syllabusAIPMT 2010 (Prelims)
8

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
9

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
10

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

  1. NaH > LiH > KH > RbH > CsH
  2. LiH > NaH > KH > RbH > CsH
  3. CsH > RbH > KH > NaH > LiH
  4. KH > NaH > LiH > CsH > RbH
Out of syllabusAIPMT 2008
11

The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is

  1. BeCO3 < MgCO3 < CaCO3 < K2CO3
  2. MgCO3 < BeCO3 < CaCO3 < K2CO3
  3. K2CO3 < MgCO3 < CaCO3 < BeCO3
  4. BeCO3 < MgCO3 < K2CO3 < CaCO3
Out of syllabusAIPMT 2007

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