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s-Block Elements · Question 1

NEET (UG) 2023MCQEasy📈 Topic in 25% papers+4−1
1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

  1. Both A and R are true but R is NOT the correct explanation of A.
  2. A is true but R is false
  3. A is false but R is true
  4. Both A and R are true and R is the correct explanation of A.

Answer

(2) A is true but R is false

Solution

Alkali metals dissolve in liquid ammonia giving ammoniated cations and ammoniated electrons:

M+(x+y)NH3 [M(NH3)x]+ + [e(NH3)y]-

The deep blue colour is due to the ammoniated electron, which absorbs in the visible region; the unpaired ammoniated electrons make the solution paramagnetic. So A is true.

The blue colour is not due to amide; on standing, the solution slowly liberates H2 and forms amide, NaNH2 (colourless). So R is false.

Answer: (2)

Out of syllabusNEET (UG) 2023

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2

Which one of the following statements is correct?

  1. All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor.
  2. The bone in human body is an inert and unchanging substance.
  3. Mg plays roles in neuromuscular function and interneuronal transmission.
  4. The daily requirement of Mg and Ca in the human body is estimated to be 0.2-0.3 g.
Out of syllabusNEET (UG) 2023
3

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.
Out of syllabusNEET (UG) 2022
4

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
5

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)
6

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
7

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
8

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
9

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
10

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
11

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

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