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  • Subject:

    Chemistry

  • Topic:

    Classification of Elements and Periodicity

the tenth element in the periodic table resembles:

(1)the second

(2)the fourth

(3)the fifth

(4)the eight

Which of the following order is not in accordance with the property stated against it ?

                                                                                                           

(a) F2 > Cl> Br2 > l2 Oxidising Power

(b) Hl > HBr >HCl >HF Acidic property in water

(c) F2 > Cl> Br2 > lElectronegativity

(d) F2 > Cl> Br2 > l2 Bond dissociation energy

An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:

(a) XO3, basic

(b) XO3, acidic

(c) X2O3, amphoteric

(d) X2O3, basic

The outermost electronic configuration of the most electronegative element is :

(a) ns2np3

(b) ns2np4

(c) ns2np5

(d) ns2np6

The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :

(a) X = 2, 8, 3

(b) Y = 2, 8, 8

(c) Z = 2, 8, 8, 1

(d) j = 2, 8, 8, 7

Which statement is true?

(1) the electronegative nature of elements increases along the period

(2) the electropositive nature of elements increases along the period

(3) the chemical reactivity of elements increases along the period

(4) the chemical reactivity of element decreases along the period

The most non-metallic element among the following is:

(a) Be

(b) B

(c) Mg

(d) Al

58Ce is a member of:

(a) s-block elements

(b) p-block elements

(c) d-block elements

(d) f-block elements

The screening effect of 'd' electrons is :

(a) much less than s-electrons

(b) much more than s-electrons

(c) equal to s-electrons

(d) equal to p-electrons

Transuranic elements are those which are:

(a) of higher atomic number than uranium

(b) lighter than uranium

(c) of lower atomic number than uranium

(d) of same atomic number as uranium