NDA CHEMISTRY QUIZ

Question 1:

On descending the group, electron gain enthalpy become

Less negative

More negative

Remain same

Highly positive

Question 2:

Which of the following elements do not show variable oxidation state?

s-block elements

p-block elements

d-block elements

f-block element

Question 3:

Which one of the following statements is correct about the trends in the properties of the elements of a period on going from left to right?

The oxides become more basic

The elements become more metallic

There is an increase in the number of valence electrons

The atoms lose their electrons more easily

Question 4:

The most common oxidation state shown by lanthanides is

+2

+3

+1

+4

Question 5:

Generally second electron gain enthalpy of an element is

Positive

Negative

Zero

Both 1 and 3

Question 6:

O^2-, F^–, Na⁺ are isoelectronic species. They have same

Number of protons

Number of neutrons

Number of electrons

Number of nucleons

Question 7:

DIRECTIONS: Read the following two statements and choose the correct answer.

Statements I – Electron gain enthalpy of some of elements of group 2 are less negative than the corresponding elements of the third period.

Statement II – Electron gain enthalpy become less negative as we go down the group

Statement I is incorrect but II is correct

Statement II is incorrect but I is correct

Both statements are correct and statement 2 is the correct explanation of statement 1

Both statements are correct and statement 2 is the not the correct explanation of statement 1

Question 8:

Where would you locate the element with electronic configuration 2,6 in modern periodic table?

Group 8

Group 2

Group 18

Group 16

Question 9:

The elements A,B,C,D,E have atomic numbers 4, 11, 17, 12 and 13. Which of the following elements belong to the same group?

A and D

B and D

A and C

D and E

Question 10:

Which out of them has the smallest radii?

Na

Li

K

Ca

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NDA CHEMISTRY QUIZ - 37

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