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s-Block Elements · Question 15

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

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.

Answer

(1) Ca2+ ions are not important in maintaining the regular beating of the heart.

Solution

As per NCERT, calcium plays important roles in neuromuscular function, interneuronal transmission, cell membrane integrity and blood coagulation; Ca2+ is required to maintain the regular beating of the heart.

Mg2+ is present in chlorophyll (green parts of plants), and all enzymes that utilise ATP in phosphate transfer require Mg2+ (Mg–ATP complex).

Statement (1) is false.

Answer: (1)

Out of syllabusNEET 2016 (Phase 1)

Keep practising — s-Block Elements

2

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)
3

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)
4

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)
5

On heating which of the following releases CO2 most easily?

  1. Na2CO3
  2. MgCO3
  3. CaCO3
  4. K2CO3
Out of syllabusAIPMT 2015
6

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)
7

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)
8

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)
9

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)
10

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)
11

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)

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