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s-Block Elements · Question 9

NEET (UG) 2020MCQMedium📈 Topic in 0% papers+4−1
1

HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of the following compound(s) crystallize(s)?

  1. Only NaCl
  2. Only MgCl2
  3. NaCl, MgCl2 and CaCl2
  4. Both MgCl2 and CaCl2

Answer

(1) Only NaCl

Solution

As per NCERT (Purification of common salt), pure sodium chloride is obtained by passing hydrogen chloride gas into the saturated solution.

HCl increases the concentration of Cl- ions, so the ionic product [Na+][Cl-] exceeds the solubility product of NaCl (common-ion effect) and NaCl crystallises out.

CaCl2 and MgCl2, being more soluble than NaCl, remain in solution.

Answer: (1)

Out of syllabusNEET (UG) 2020

Keep practising — s-Block Elements

2

Which of the following is an amphoteric hydroxide?

  1. Mg(OH)2
  2. Be(OH)2
  3. Sr(OH)2
  4. Ca(OH)2
Out of syllabusNEET (UG) 2019
3

Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is

  1. Ca
  2. Sr
  3. Be
  4. Mg
Out of syllabusNEET (UG) 2019
4

Which of the following oxides is most acidic in nature?

  1. MgO
  2. BeO
  3. BaO
  4. CaO
NEET 2018
5

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

  1. Mg2X3
  2. MgX2
  3. Mg2X
  4. Mg3X2
Out of syllabusNEET 2018
6

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+
Out of syllabusNEET 2017
7

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)
8

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)
9

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)
10

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)
11

On heating which of the following releases CO2 most easily?

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

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