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s-Block Elements · Question 32

AIPMT 2009MCQEasy📈 Topic in 12% papers+4−1
1

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

  1. CaO
  2. SiO2
  3. BeO
  4. B2O3

Answer

(1) CaO

Solution

A base like NaOH reacts with acidic or amphoteric oxides.

SiO2 and B2O3 are acidic oxides, and BeO is amphoteric (as per NCERT, BeO is amphoteric while the oxides of other alkaline earth metals are basic); all three react with NaOH.

SiO2 + 2NaOH Na2SiO3 + H2O

BeO + 2NaOH + H2O Na2[Be(OH)4]

∴ CaO, a basic oxide, does not react with NaOH.

Answer: (1)

Out of syllabusAIPMT 2009

Keep practising — s-Block Elements

2

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
3

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
4

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
5

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

  1. MgSO4
  2. RaSO4
  3. SrSO4
  4. BaSO4
Out of syllabusAIPMT 2007
6

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 syllabusAIPMT 2006
7

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
Out of syllabusAIPMT 2004
8

In which of the following processes, fused sodium hydroxide is electrolysed at a temperature of 330 C for extraction of sodium?

  1. Castner's process
  2. Downs process
  3. Cyanide process
  4. Both (2) and (3)
Out of syllabusAIPMT 2002
9

Mg is present in

  1. chlorophyll
  2. haemoglobin
  3. vitamin-D
  4. vitamin-B
AIPMT 2000

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