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s-Block Elements · Question 3

NEET (UG) 2022MCQEasy📈 Topic in 25% papers+4−1
1

Identify the incorrect statement from the following

  1. Alkali metals react with water to form their hydroxides.
  2. The oxidation number of K in KO2 is +4.
  3. Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
  4. Lithium is the strongest reducing agent among the alkali metals.

Answer

(2) The oxidation number of K in KO2 is +4.

Solution

KO2 is potassium superoxide, made of K+ and O2- ions.

x + 2 (- 12 ) = 0

x = +1

The oxidation number of K is +1, not +4; statement (2) is incorrect.

As per NCERT, alkali metals react with water to form hydroxides and dihydrogen; ionisation enthalpy decreases down the group; and lithium, with the most negative E value, is the strongest reducing agent.

Answer: (2)

Out of syllabusNEET (UG) 2022

Keep practising — s-Block Elements

2

Match List - I with List - II Choose the correct answer from the options given below :

  1. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
  2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  3. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
  4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
Out of syllabusNEET (UG) 2022
3

CaCl2 and Ca(OCl)2 are components of

  1. Lime water
  2. Gypsum
  3. Portland cement
  4. Bleaching powder
Out of syllabusNEET (UG) 2022 (Phase 2)
4

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :

  1. Beryllium chloride
  2. Calcium chloride
  3. Strontium chloride
  4. Magnesium chloride
Out of syllabusNEET (UG) 2021
5

The structures of beryllium chloride in solid state and vapour phase, are :

  1. Chain in both
  2. Chain and dimer, respectively
  3. Linear in both
  4. Dimer and Linear, respectively
Out of syllabusNEET (UG) 2021
6

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na+, is responsible for the transmission of nerve signals.

  1. Copper
  2. Calcium
  3. Potassium
  4. Iron
Out of syllabusNEET (UG) 2020
7

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
Out of syllabusNEET (UG) 2020
8

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
9

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
10

Which of the following oxides is most acidic in nature?

  1. MgO
  2. BeO
  3. BaO
  4. CaO
NEET 2018
11

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

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