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## Chemistry

Classification of Elements and Periodicity in Properties

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Q 1. The correct order of second ionisation potential of carbon,nitrogen, oxygen and fluorine is

A

{tex} \mathrm { C } > \mathrm { N } > \mathrm { O } > \mathrm { F } {/tex}

B

{tex} \mathrm { O } > \mathrm { N } > \mathrm { F } > \mathrm { C } {/tex}

{tex} \mathrm { O } > \mathrm { F } > \mathrm { N } > \mathrm { C } {/tex}

D

{tex} \mathrm { F } > \mathrm { O } > \mathrm { N } > \mathrm { C } {/tex}

##### Explanation

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Q 2. The element with the highest first ionization potential is

A

boron

B

carbon

nitrogen

D

oxygen

##### Explanation

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Q 3. Which one of the following is the smallest in size?

A

{tex} \mathrm { N } ^ { 3 -} {/tex}

B

{tex} \mathrm{O ^ { 2- } }{/tex}

C

{tex} \mathrm { F } ^ { - } {/tex}

{tex} \mathrm { Na } ^ { + } {/tex}

##### Explanation

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Q 4. Amongst the following elements (whose electronic configurations are given below), the one having the highest ionization energy is:

A

{tex} [ \mathrm {{ Ne } ] 3 s ^ { 2 } 3 p ^ { 1 }} {/tex}

{tex} [ \mathrm {{ Ne } ] 3 s ^ { 2 } 3 p ^ { 3 }} {/tex}

C

{tex} [ \mathrm {{ Ne } ] 3 s ^ { 2 } 3 p ^ { 2 }} {/tex}

D

{tex} [ \mathrm {{ Ne } ] 3 d ^ { 10 } 4 s ^ { 2 } 4 p ^ { 3 }} {/tex}

##### Explanation

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Q 5. The correct order of acidic strength is

{tex} \mathrm { Cl } _ { 2 } \mathrm { O } _ { 7 } > \mathrm { SO } _ { 2 } > \mathrm { P } _ { 4 } \mathrm { O } _ { 10 } {/tex}

B

{tex} \mathrm { CO } _ { 2 } > \mathrm { N } _ { 2 } \mathrm { O } _ { 5 } > \mathrm { SO } _ { 3 } {/tex}

C

{tex} \mathrm { Na } _ { 2 } \mathrm { O } > \mathrm { MgO } > \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } {/tex}

D

{tex} \mathrm { K } _ { 2 } \mathrm { O } > \mathrm { CaO } > \mathrm { MgO } {/tex}

##### Explanation

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Q 6. Identify the correct order of acidic strengths of {tex} \mathrm { CO } _ { 2 } , \mathrm { CuO } {/tex},
{tex} \mathrm { CaO } , \mathrm { H } _ { 2 } \mathrm { O } {/tex}

{tex} \mathrm { CaO } < \mathrm { CuO } <\mathrm { H } _ { 2 } \mathrm { O } < \mathrm { CO } _ { 2 } {/tex}

B

{tex} \mathrm { H } _ { 2 } \mathrm { O } < \mathrm { CuO } < \mathrm { CaO } < \mathrm { CO } _ { 2 } {/tex}

C

{tex} \mathrm { CaO } < \mathrm { H } _ { 2 } \mathrm { O } < \mathrm { CuO } < \mathrm { CO } _ { 2 } {/tex}

D

{tex} \mathrm { H } _ { 2 } \mathrm { O } < \mathrm { CO } _ { 2 } < \mathrm { CaO } < \mathrm { CuO } {/tex}

##### Explanation

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Q 7.

Which of the following has the electronic configuration ?

A

Cr

C

D

V

##### Explanation

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Q 8.

Electron affinity is positive when

A

is formed from

is formed from

C

is formed from

D

Electron affinity is always a negative value

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Q 9.

are elements in the third short period. Oxide of is ionic, that of is amphoteric and of a giant molecule. and will have atomic number in the order

B

C

D

##### Explanation

Thus, atomic number increases in the order

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Q 10.

First long period contains …….. elements

A

8

18

C

32

D

2

##### Explanation

First long period starts with 3rd period [K(19) Kr(36)]

Thus, total = 18 elements

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Q 11.

Li resemble Mg. This is called diagonal relationship which is attributed to

Same value of electronegativity

B

Same value of electron affinity

C

Penetration of sub-shells

D

Identical effective nuclear charge

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Q 12.

Which of the following does not represent the correct order of the properties indicated?

(size)

B

(size)

C

(unpaired electron)

D

(unpaired electron)

##### Explanation

is smallest in size

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Q 13.

If Aufbau and Hund’s rule are not used, then incorrect statement is

would be coloured ion

B

Na will be in same -block (if these rules are true)

C

Cu would be -block element

D

Magnetic moment of Cr(24) would be zero

##### Explanation

Colourless ion due to lack of electron in -orbitals

Thus, (a) is incorrect

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Q 14.

Representative elements belong to

- and -block

B

-block

C

- and -block

D

-block

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Q 15.

Which of the following oxides is highly basic?

A

B

C

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Q 16.

If Aufbau rule is not followed, K-19 will be placed in ……. block

A

B

D

##### Explanation

E.C. of K = 19 in the absence of Aufbau rule is

Last-filling electron goes into -orbital

Thus, -block element

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Q 17.

Which of the following metals forms a amphoteric oxide?

A

Ca

B

Ni

Zn

D

Fe

##### Explanation

Basic oxide

Acidic oxide

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Q 18.

Catenation properties of C, Si, are in order

B

C

D

None of the above is correct

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Q 19.

Select the correct statement

More active metals are on the left side of the Periodic Table

B

Less active metals are on the left side of the Periodic Table

C

Reducing power decreases moving down the group

D

All the above are correct statements

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Q 20.

The electronegativities of elements and are 1.2 and 3.4 units respectively. The type of bond connecting and in compound is

A

Covalent

Ionic

C

Coordinate covalent

D

Polar covalent

##### Explanation

is electropositive element

is electronegative element

Thus, ionic bond is formed

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Q 21.

Which of the following will have maximum electron affinity?

A

B

D

##### Explanation

(b) and (d) with configuration has zero values of EA

(c) with empty -orbital has greater EA than F(a)

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Q 22.

Select the correct alternate

A

Due to lanthanide contraction and have almost equal size

B

Due to completion of -subshell, the electronic charge density in this subshell becomes very high which increases the inter-electronic repulsion hence, size increases

Both (a) & (b) are correct statements

D

Both of the above are incorrect statements

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Q 23.

Point out the oxide which is amphoteric in nature

A

CO

B

D

##### Explanation

is soluble in an acidic oxide

is soluble in a basic acid

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Q 24.

Covalent radius of nitrogen is 70 pm. Hence, covalent radius of boron is about

A

60 pm

110 pm

C

50 pm

D

40 pm

##### Explanation

Radius decreases along a period left to right

Thus, covalent radius of B would be higher than that of N

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Q 25.

Melting points of and will be in order

B

C

D

##### Explanation

Smaller the size of anion, smaller the polarizing power and thus larger the ionic character of . Thus, ionic character

and mp :