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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NTA Abhyas 2020 · Chemistry · Classification of Elements and Periodicity in Properties

The atomic number of elements A, B, C and D are Z - 1,Z,Z+1,Z+2...

The atomic number of elements A, B, C\text{A, B, C} and D\text{D} are Z−1,Z,Z+1,Z+2\text{Z} - \text{1,}\text{Z,}\text{Z}\text{+}\text{1,}\text{Z}\text{+}\text{2} respectively. If B\text{B} is a noble gas, choose the correct option
(i) (A)\text{(A)} has higher electron affinity
(ii) \left(\text{C}\right)existsin+2oxidationstate<br/>(iii)(D)exists in + 2 oxidation state<br /> (iii) \left(\text{D}\right) is an alkaline earth metal

Options

  1. A(i)and(ii)\left(i\right)and \left(ii\right)
  2. B(ii)and(iii)\left(ii\right)and \left(iii\right)
  3. C(i)and(iii)\left(i\right)and \left(iii\right)
  4. D(i),(ii)and(ii)\left(i\right), \left(ii\right)and \left(ii\right)

Correct answer

C. (i)and(iii)\left(i\right)and \left(iii\right)

Step-by-step solution

Atomic number of (B)=Z\left(B\right) = Z and is a noble gas

Atomic number of \left(A\right) = Z - 1(i.e.,isaHalogen)<br/><br/>Atomicnumber(C),=Z+1(i.e., is a Halogen)<br/><br/>Atomic number \left(C\right), = Z + 1 (i.e., is a alkali metal)

At number of \left(D\right) = Z + 2(i.e.,alkalineearthmetal)<br/><br/>Hence,element(A)(i.e., alkaline earth metal)<br/><br/>Hence, element \left(A\right) must be a Halogen, so has highest electron affinity among the given species. \left(C\right) .isanalkalimetaland(D)is an alkali metal and \left(D\right) is an alkaline earth metal
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