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s-Block Elements

AIPMT 2010 (Mains)MCQMedium📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2010 (Mains)

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

Answer

(1) CaCO3

Solution

(A)CaCO3 CaO + colourless gasCO2

CaO + H2O (B)Ca(OH)2

Ca(OH)2 + 2CO2 (excess) (C)Ca(HCO3)2

Ca(HCO3)2 (A)CaCO3 + H2O + CO2

Na2CO3 and K2CO3 do not decompose on heating, and gypsum only loses water.

The compound A is CaCO3.

Answer: (1)

Out of syllabus

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Ques. 2AIPMT 2010 (Prelims)

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 syllabus
Ques. 3AIPMT 2010 (Prelims)

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 syllabus
Ques. 4AIPMT 2010 (Prelims)

Which one of the following compounds is a peroxide?

  1. KO2
  2. BaO2
  3. MnO2
  4. NO2
Out of syllabus
Ques. 5AIPMT 2009

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

  1. CaO
  2. SiO2
  3. BeO
  4. B2O3
Out of syllabus
Ques. 6AIPMT 2008

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 syllabus
Ques. 7AIPMT 2008

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 syllabus
Ques. 8AIPMT 2007

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 syllabus
Ques. 9AIPMT 2007

In which of the following the hydration energy is higher than the lattice energy?

  1. MgSO4
  2. RaSO4
  3. SrSO4
  4. BaSO4
Out of syllabus
Ques. 10AIPMT 2006

The correct order of the mobility of the alkali metal ions in aqueous solution is

  1. Rb+ > K+ > Na+ > Li+
  2. Li+ > Na+ > K+ > Rb+
  3. Na+ > K+ > Rb+ > Li+
  4. K+ > Rb+ > Na+ > Li+
Out of syllabus
Ques. 11AIPMT 2004

A solid compound X on heating gives CO2 gas and a residue. The residue mixed with water forms Y. On passing an excess of CO2 through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is

  1. Ca(HCO3)2
  2. CaCO3
  3. Na2CO3
  4. K2CO3
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