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s-Block Elements · Question 14

NEET 2017MCQEasy📈 Topic in 25% papers+4−1
1

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

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

Answer

(3) Li+

Solution

As per NCERT, the hydration enthalpies of alkali metal ions decrease with increase in ionic size: Li+ > Na+ > K+ > Rb+ > Cs+

Li+ is the smallest ion, it has the maximum degree of hydration

Size of hydrated ion: Li+(aq) > Na+(aq) > K+(aq) > Rb+(aq)

A larger hydrated ion moves more slowly in an electric field.

Ionic mobility: Li+ < Na+ < K+ < Rb+; Li+ has the lowest mobility.

Answer: (3)

Out of syllabusNEET 2017

Keep practising — s-Block Elements

2

Which of the following statements is false?

  1. Ca2+ ions are not important in maintaining the regular beating of the heart.
  2. Mg2+ ions are important in the green parts of the plants.
  3. Mg2+ ions form a complex with ATP.
  4. Ca2+ ions are important in blood clotting.
Out of syllabusNEET 2016 (Phase 1)
3

The product obtained as a result of a reaction of nitrogen with CaC2 is

  1. CaCN2
  2. Ca2CN
  3. Ca(CN)2
  4. CaCN
Out of syllabusNEET 2016 (Phase 1)
4

The suspension of slaked lime in water is known as

  1. lime water
  2. quick lime
  3. milk of lime
  4. aqueous solution of slaked lime.
Out of syllabusNEET 2016 (Phase 2)
5

In context with beryllium, which one of the following statements is incorrect?

  1. It is rendered passive by nitric acid.
  2. It forms Be2C
  3. Its salts rarely hydrolyze.
  4. Its hydride is electron-deficient and polymeric.
Out of syllabusNEET 2016 (Phase 2)
6

On heating which of the following releases CO2 most easily?

  1. Na2CO3
  2. MgCO3
  3. CaCO3
  4. K2CO3
Out of syllabusAIPMT 2015
7

The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

  1. K+
  2. Fe2+
  3. Ca2+
  4. Mg2+
Out of syllabusAIPMT 2015 (Cancelled)
8

Solubility of the alkaline earth metal sulphates in water decreases in the sequence

  1. Sr > Ca > Mg > Ba
  2. Ba > Mg > Sr > Ca
  3. Mg > Ca > Sr > Ba
  4. Ca > Sr > Ba > Mg
Out of syllabusAIPMT 2015 (Cancelled)
9

In Castner-Kellner cell for production of sodium hydroxide

  1. brine is electrolyzed using graphite electrodes
  2. molten sodium chloride is electrolysed
  3. sodium amalgam is formed at mercury cathode
  4. brine is electrolyzed with Pt electrodes
Out of syllabusNEET 2013 (Karnataka)
10

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

  1. Rb
  2. K
  3. Li
  4. Na
Out of syllabusAIPMT 2012 (Prelims)
11

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)

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