Chapter 7 p-Block Elements MCQs for Class 12 Chemistry

Chapter 7 p-Block Elements MCQs for Class 12 Chemistry

Here students can practice Chapter 7 p-Block Elements MCQs for Class 12 Chemistry. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the button. Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.

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Q 1.: Acidity of diprotic acids in aqueous solution increases in the order :

(A) H2S < H2Se < H2Te

(B) H2Se < H2S < H2Te

(C) H2Te < H2S < H2Se 

(D) H2Se < H2Te < H2

Option – A

Q 2.: The statement that is not correct is ;

(A) Hypophosphorous acid reduces silver nitrate to silver

(B) In solid state PCl5 exists as [PCl4]+ , [PCl6]

(C) Pure phosphine is non-inflammable 

(D) Phosphorous acid on heating disproportionate to give metaphosphoric acid and phosphine

Option – C

Q 3.: The species that is not hydrolysed in water is __________

(A) P4O10  

(B) BaO2

(C) Mg3N2 

(D) CaC2 

Option – A

Q 4.: The correct arrangement of following acids of phosphorus in the increasing order of oxidation state of phosphorus is ;

(A) Hypophosphorus acid < Orthophosphoric acid < Pyrophosphoric acid

(B) Hypophosphorus acid < Pyrophosphoric acid < Orthophosphoric acid

(C) Pyrophosphoric acid < Hypophosphorus acid < Orthophosphoric acid

(D) Pyrophosphoric acid < Orthophosphoric acid < Hypophosphorus acid

Option – B

Q 5.: Which among the following group-16 elements exists in more than two allotropic states ?

 (A) Polonium

(B) Tellurium

(C) Selenium

(D) Oxygen

Option – C

Q 6.: The mixture of concentrated HCl and HNO3 made in 3 : 1 ratio contains ;

(A) NOCl 

(B) NCl3

(C) ClO2

(D) N2O4

Option – A

Q 7.: A hydride of nitrogen which is acidic ;

(A) NH3   

(B) N2H2   

(C) N2H4 

(D) N3H

Option – D

Q 8.: When conc. H2SO4 is heated with P2O5, the acid is converted to :

(A) Sulphur dioxide

(B) Sulphur trioxide

(C) Sulphur

(D) Mixture of Sulphur dioxide and Sulphur trioxide

Option – B

Q 9.: Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield ;

(A) Sulphur trioxide and water

(B) Hydrogen and sulphurous acid

(C) Sulphur and water

(D) Hydrogen peroxide and sulphur

Option – C

Q 10.: Which of the following statements is not valid for oxoacids of phosphorus ?

(A) Orthophosphoric acid is used in the manufacture of triple super phosphate

(B) Hypophosphorous acid is a diprotic acid

(C) All oxoacids contain tetrahedral four coordinated phosphorus

(D) All oxoacids contain at least one P=O unit and one P—OH bond oh age group

Option – B

Q 11.: Ammonia, on reaction with excess of chlorine, gives

(A) N4 and NH4Cl

(B) NCl3 and NH4Cl

(C) N2 and HCl

(D) NCl3 and HCl

Option – D

Q 12.: Which one of the following compound is a peroxide ?

(A) NO2 

(B) KO2 

(C) MnO2 

(D) BaO2 

Option – D

Q 13.: In pyrophosphoric acid the number of hydroxyl groups are ;

(A) Four

(B) Three

(C) Two

(D) One

Option – A

Q 14.: The oxidation number of phosphorous in cyclotrimetaphosphoric acid is ____

(A) +3

(B) +5 

(C) −3

(D) +2

Option – B

Q 15.: Which is not the correct statement ?

(A) The S8 ring is not planar

(B) Oxygen is more electronegative than sulphur 

(C) SF4 exists but OF4 does not exist

(D) SO3 and SO32- both have trigonal planar geometry

Option – D

Q 16.: If the supply of oxygen is limited, H2S reacts with O2 to form ________

(A) H2O + S   

(B) H2O + SO3   

(C) H2O + SO2 

(D) H2SO4 + S

Option – A

Q 17.: Bromine water reacts with SO2 to form

(A) HBr and S   

(B) H2O and HBr     

(C) H2SO4 and HBr

(D) S and H2

Option – C

Q 18.: The number of P—O bonds in P4O10 is

(A) 8

(B) 12 

(C) 16

(D) 18

Option – C

Q 19.: Sulphuric acid reacts with PCl5 to give

(A)  Thionyl chloride

(B) Sulphuryl chloride 

(C) Sulphur monochloride

(D) Sulphur tetrachloride 

Option – B

Q 20.: P4O10 is the anhydride of _____

(A) H3PO2

(B) H3PO3

(C) H4P2O7

(D) H3PO4

Option – D

Q 21.: Ozone can be tested by

(A) Ag 

(B) Hg 

(C) Zn 

(D) Au 

Option – B

Q 22.: Caro’s acid is _________

(A) H2S2O3  

(B) H2SO5    

(C) H2S2O8   

(D) H2SO3

Option – B

Q 23.: Which of the following statements regarding ozone is not correct ?

(A) The ozone molecule is angular in shape

(B) The ozone is a resonance hybrid of two structures

(C) The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen

(D) Ozone is used as germicide and disinfectant for the purification of air. 

Option – C

Q 24.: Gaseous product obtained on thermal decomposition of (NH4)2Cr2O7 is

(A) N2

(B) NH3

(C) O2

(D) NO

Option – A

Q 25.: For H3PO3, the correct choice is

(A) Dibasic and Reducing

(B) Dibasic and non-reducing

(C) Tribasic and Reducing 

(D) Tribasic and non-reducing

Option – A

Q 26.: Phosphorus pentoxide is widely used as

(A) Bleaching agent 

(B) Oxidising agent

(C)  Reducing agent 

(D) Dehydrating agent

Option – D

Q 27.: Which of the following is not correct ? White phosphorus (P4) has

(A) Four lone pair of electrons

(B) PPP angle is 60°

(C) Four P—P single bond 

(D) Six P—P single bond 

Option – C

Q 28.: KMnO4 is a strong oxidising agent in acidic medium. To provide acidic medium H2SO4 is used instead of HCl. This is because ;

(A) H2SO4 is a stronger acid than HCl 

(B) HCl is oxidised by KMnO4 to Cl2

(C) H2SO4 is a dibasic acid 

(D) Only H2SO4 is completely ionised

Option – B

Q 29.: Bleaching action of SO3 is due to its _____

(A) Oxidising property

(B) Acidic property

(C) Basic property

(D) Reducing property

Option – D

Q 30.: Thermodynamically, most stable form of phosphorous is _____

(A) Red P

(B) White P

(C) Black P

(D) Yellow P

Option – C

Q 31.: Which of the following salt would give SO2 with hot and dilute H2SO4 and also decolourises Br2 water ?

(A) Na2SO3  

(B) NaHSO4  

(C) Na2SO4  

(D) Na2S

Option – A

Q 32.: Of the following compounds, the most acidic is ;

(A) As2O3

(B) Bi2O3

(C) Sb2O3

(D) P2O5

Option – D

Q 33.: Carbogen is a mixture of ________

(A) CO2 + N2    

(B) CO + O2    

(C) CO2 + O2    

(D) CO + O2 + N2

Option – C

Q 34.: CaCN2 + C is called as :

(A) Nitrolim 

(B) Thomas slag 

(C) Seyferth-Gilbert reagent

(D) Koser’s reagent

Option – A

Q 35.: A colourless gas with the smell of rotten fish is ______

(A) NH3 

(B) PH3 

(C) SO2

(D) H2S

Option – B

Q 36.: Which of the following has the highest proton affinity ?

(A) Arsine (AsH3)

(B) Stibine (SbH3)

(C) Phosphine (PH3)

(D) Ammonia (NH3)

Option – D

Q 37.: Which phosphorous react with KOH solution to produce phosphene gas ?

(A) White P

(B) Red P

(C) Black P

(D) Both ‘A’ and ‘C’

Option – A

Q 38.: Which of the following oxide of nitrogen is most thermally stable ?

(A) N2O5

(B) N2O

(C) NO

(D) N2O3

Option – C

Q 39.: The molecular formula of dithionic acid is _______

(A) H2S2O4    

(B) H2S2O6    

(C) H2S2O5  

(D) H2S2O7   

Option – B

Q 40.: When PbO2 reacts with concentrated HNO3, the gas evolved is :

(A) NO2

(B) O2

(C) N2

(D) N2O

Option – B


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We hope that these Chapter 7 p-Block Elements MCQs for Class 12 Chemistry helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 7 p-Block Elements MCQs for Class 12 Chemistry, click on the question range given above.

Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.