MCQ class12 chemistry ch-6 P-block element

Q. 1) which of the following not shows allotropes? 

a) P

b) N

c) Bi

d) As

Q. 2) The melting point of any element depends on

a) wander waals force

b) packing efficiency

c) Molar mass

d) All of the above

Q. 3) which one of the following has rotten smell? 

a) NH3

b) SbH3

c) PH3

d) NH2

[18/08, 10:20 pm] Sunaina Prajapati: Q. 4) which of the following known as pearl white? 

a) BiOCl

b) SbO2

 Q. 5) what happens when metal(M) react with group 15 (X) ? 

a)M2X2

b) M3X2

c) M2X3

d) none of the these

Q. 6) which one of the following known as hydrazine? 

a) N2H5

b) NH3

c) N2H4

d) NH2CO3

Q. 6) which of the following compound appear as blue colour? 

a) N2O3

b) N2O4

c) N3O2

d) all of the above

Answer:a

Q. 7) which of the following is correct about wander waals force of attraction is directly proportional to? 

a) Electronegative

b) Molar mass

c) atomic mass

d) hydrogen bonding

Ans:b

Q. 8) why boiling point of SbH3 higher than NH3? 

a) Big size

b) more stable

c) wander waals force

d) hydrogen bonding

Answer:c

Q. 9) what is the nature of given compound N2O3? 

a) acidic

b) basic

c) nutral

d) all of the above

Q. 10) how can we extract extra pure N2 by heating which of the following? 

a) NH3

b) NaNO2

c) Ba(N3) 2

d) none of these

Q. 11) how many bonds formed by Nitrogen? 

a) 5

b) 4

c) 3

d) 2

Answer:b

Q. 12) how many coordinate bonds formed by Nitrogen? 

a) 1

b) 2

c) 3

d) 0

Answer:b

Q. 13) which of the following reagent formed during reaction of nitric acid and hydrochloric acid (aqua Regia) ? 

a) Luca's reagent

b) grignard reagent

c) Tilden's reagent

d) none of these

Answer:c

Q. 14) which of the following Phosphorus allotropes is more reactive? 

a) Red phosphorus

b) white phosphorus

c) both a and b

c) green phosphorus

Answer:b

Q. 15) which of the following is the an hydride of the given compound H3PO4? 

a) P4O8

b) P4O10

c) P4O9

d) P4O12

Answer:b

Q. 16) which of the following group known as chalcogen family? 

a) group14

b) group 12

c) group 15

d) group 18

Answer:c