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s-Block Elements · Question 18

NEET 2016 (Phase 2)MCQMedium📈 Topic in 12% papers+4−1
1

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.

Answer

(3) Its salts rarely hydrolyze.

Solution

(1) Beryllium is rendered passive by nitric acid due to the formation of a protective oxide film on its surface. Correct.

(2) Beryllium combines with carbon to form the carbide Be2C (methanide). Correct.

(3) Be2+ is very small with a high charge density (high polarising power), its salts are extensively hydrolysed, e.g.

BeCl2 + 2H2O Be(OH)2 + 2HCl

the statement "its salts rarely hydrolyze" is incorrect.

(4) BeH2 is electron-deficient and polymeric, with three-centre two-electron (Be–H–Be) bridge bonds. Correct.

Answer: (3)

Out of syllabusNEET 2016 (Phase 2)

Keep practising — s-Block Elements

2

On heating which of the following releases CO2 most easily?

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

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)
4

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)
5

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)
6

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)
7

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)
8

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)
9

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)
10

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)
11

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)

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