NDA CHEMISTRY QUIZ

Question 1:

Directions – Question consist of two statements labelled as statement I and statement II . Examine both the statement and mark the correct choice according to the codes given below

Statement I- Electron gain enthalpy of fluorine is less negative than chlorine

Statement II – Fluorine has small size , addition of electron in it result in electron -electron repulsion .

Both statement I and statement II are true and Statement II is the correct explanation of Statement I

Both statement I and statement II are true and Statement II is not the correct explanation of Statement I

Statement I is true , but statement II is false

Statement I is false , but II is true

Question 2:

Chemical properties of lithium is similar to magnesium because

Both carry same charge

Both have nearly the same size

Both have similar electronic configuration

The ratio of their charge and size (i.e. charge density) is nearly the same

Question 3:

The group number, number of valence electrons, and valency of an element with the atomic number 17, respectively, are

17, 7 and 2

17, 5 and 3

17, 7 and 1

17, 7 and 2

Question 4:

Which of the following is the correct order of ionization enthalpy ?

Li >Na>K>Rb

Li < Na < K >Rb

Li > Na< K > Rb

Li < Na > K > Rb

Question 5:

Flourine is the most electronegative element .The element next to F in electronegativity is

N

Cl

O

Ne

Question 6:

Successive ionization enthalpy always

Increase

Decrease

Remains constant

First increase then decrease

Question 7:

Which of the following oxides is neutral in character?

SnO₂

CO

SiO₂

CaO

Question 8:

Which of the following is the correct order of electron gain enthalpy ?

Se < S < O

Se < O < S

S < O < Se

S < Se < O

Question 9:

Which of the following properties generally first increase and then decrease along a period?

Ionization Energy

Metallic Character

Electron Gain enthalpy

Valency.

Question 10:

The Electronic configuration of an element is 1s²2s²2p⁴ . To which group this element belongs?

s-block

p-block

d-block

f-block

NDA CHEMISTRY QUIZ - 19

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NDA CHEMISTRY QUIZ - 19

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