Periodic Classification Quiz No:15

Question No:1

EN of the element (A) is E1 and IP is E2. Hence EA will be

[A] 2E1-E2

[B] E1-E2

[C] E1-2E2

[D] (E1+E2)/2

Question No:2

Number of unpaired electrons in Gd(Z =64) and the net electrons spin are

[A] 7.3.5

[B] 8,3

[C] 6,3

[D] 8,4

Question No:3

For the process

X(g)+ e — >X(g), Δ H = x and

X(g) — > X(g) + e Δ H = y

Select correct alternate:

[A] ionisation energy of X(g), is y

[B] electron affinity of X (g), is x

[C] electron affinity of X(g) , is -y

[D] all are correct statements.

Question No:4

Some statements are given regarding nature of oxides

i) In second period, nitrogen form strongest acidic oxide

ii) In third period, sodium forms strongest basic oxide

iii) Oxides of metalloids are generally Amphoteric in nature

[A] I and II are correct

[B] II and III are correct

[C] I and III are correct

[D] I, II and III are correct

Question No:5

When an atom of an electronegative element becomes anion, which of the following occurs?

[A] It acts as a reducing agent

[B] It loses electrons

[C] Its ionic radius becomes larger

[D] It accepts electrons

Question No:6

On going down a main subgroup in the periodic table (example Li to Cs in LA or Be to Ra in II A) the expected trend of change in atomic radius is a

[A] Continuous increase

[B] Continuous decrease

[C] An increase followed by decrease

[D] A decrease followed by increase

Question No:7

Identify the correct statement

[A] Filling of 5d orbital begins with Hf in 5th period

[B] Filling of 4f orbital begins with Ce in 6th period

[C] Filling of 5d orbital begins with La in 5th period

[D] Filling of 4f orbital begins with La in 6th period

Question No:8

Identify the correct order in which the ionic radius of the following ions increases :

I) F

II) Na+

III) N3-





Question No:9

The atomic radius decreases in a period due to

[A] Increase in nuclear attraction

[B] Decrease in nuclear attraction

[C] Increase in number of electrons

[D] Decrease in number of electrons

Question No:10

Following are some statements about modern periodic table

i) It consists of s, p, d and f blocks

ii) The energy levels filling order in 6th period is 6s, 4f, 5d and 6p

iii) IIIA group contains maximum number of elements

[A] only i &ii are correct

[B] only i is correct

[C] only ii & iii are correct

[D] all are correct

Question No:11

Among the following , the number of elements showing only one non-zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti .

[A] 1

[B] 3

[C] 2

[D] 4

Question No:12

The following are some statements about transition elements

i) IIB group belong to transition elements

ii) In these elements last two shells ns and (n- 1)d are partially filled

iii) They show variable valencies

[A] all are correct

[B] only iii is correct

[C] ii, iii are correct

[D] only i & ii are correct

Question No:13

Successive ionisation potentials of an element M are 8.3,25.1, 37.9,259.3 and 340.1 ev. The formula of its bromide is

[A] MBr5Z

[B] MBr4Z

[C] MBr3Z

[D] MBr2Z

Question No:14

The decreasing order of the second ionization potential of K, Ca and Ba is

[A] K>Ca>Ba

[B] Ca > Ba > K

[C] Ba > K > Ca

[D] K > Ba > Ca

Question No:15

Which of the following is not correct in the case of Be and Al ?

[A] both are rendered passive by conc.HNO3Z

[B] carbides of both give methane on hydrolysis

[C] both give hydroxides which are basic

[D] both give covalent chlorides

Question No:16

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

[A] Ca < Al < C < O < F [B] Al < Ca < O < C < F [C] Al < O < C < Ca < F [D] C < F < O < Al < Ca