Class 12 Chemistry MCQs The p-Block Elements for JEE/NEET

Here, you will get Class 12 Chemistry MCQ of Chapter 7 The p-Block Elements for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Chemistry Chapter 7 The p-Block Elements, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams. 

 The p-Block Elements 12 MCQs Questions with Answers

Catenation property is maximum in
(a) phosphorus
(b) carbon
(c) sulphur
(d) zinc

Answer: (b) carbon

Element found from sea water is
(a) magnesium
(b) Sodium
(c) Iodine
(d) None of these

Answer: (c) Iodine

Which one of the following is the strongest lewis acid?
(a) BF3
(b) BCl3
(c) BBr3
(d) Bl3

Answer: (b) BCl3

Main source of helium is
(a) Air
(b) Radium
(c) Monazite
(d) Water

Answer: (c) Monazite

H2SO4 is a/an
(a) acid
(b) base
(c) alkali
(d) salt

Answer: (a) acid

The boiling points of hydrides of group 16 are in the order
(a) H2O > H2Te > H2S > H2Se
(b) H2O > H2S > H2Se > H2Te
(c) H2O > H2Te > H2Se > H2S
(d) None of these

Answer: (b) H2O > H2S > H2Se > H2Te

The set with correct order of acidity is
(a) HClO < HClO2 < HClO3 < HClO4
(b) HClO4 < HClO3 < HClO2 < HClO
(c) HClO < HClO4 < HClO3 < HClO2
(d) HClO4 < HClO2 < HClO3 < HClO

Answer: (b) HClO4 < HClO3 < HClO2 < HClO

Partial hydrolysis of XeF4 gives
(a) XeO3
(b) XeOF2
(c) XeOF4
(d) XeF2

Answer: (b) XeOF2

Helium is preferred to be used in balloons instead of hydrogen because it is
(a) incombustible
(b) lighter than hydrogen
(c) more abundant than hydrogen
(d) non polarizable

Answer: (a) incombustible

When chlorine reacts with cold and dilute solution of sodium hydroxide, it forms
(a) Cl and ClO
(b) Cl and ClO2
(c) Cl and ClO3
(d) Cl and ClO4

Answer: (a) Cl– and ClO–

Collectively the elements of group 15 are called
(a) pnicogens
(b) pnicopens
(c) nicopen
(d) None of these

Answer: (a) pnicogens

Which one of the following elements is most metallic ?
(a) P
(b) As
(c) Sb
(d) Bi

Answer: (d) Bi

Which of the following statement is incorrect for group 15 elements ?
(a) Order of ionization enthalpies is ΔiH1 < ΔiH2 < ΔiH3
(b) The boiling point and melting point increases from top to bottom in the group
(c) Dinitrogen is a gas while all others are solids
(d) All statements are correct

Answer: (b) The boiling point and melting point increases from top to bottom in the group

Nitrogen forms N2, but phosphorus is converted into P4 from P, the reason is
(a) Triple bond is present between phosphorus atom
(b) pπ – pπ bonding is strong
(c) pπ – pπ bonding is weak
(d) Multiple bond is formed easily

Answer: (c) pπ – pπ bonding is weak

Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group. This is due to
(a) dissimilar electronic configuration
(b) due to presence of vacant d-orbitals
(c) reactivity of phosphorus
(d) inert nature of nitrogen

Answer: (b) due to presence of vacant d-orbitals

Which one has the lowest boiling point ?
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3

Answer: (b) PH3

When Cl2 reacts with hot and cone. NaOH, the oxidation number of chlorine changes from
(a) zero to +1 and zero to +5
(b) 0 to -1 and 0 to +5
(c) zero to -1 and zero to +3
(d) 0 to +1 and 0 to -3

Answer: (b) 0 to -1 and 0 to +5

 Chlorine reacts with excess of NH3 to form
(a) NH4Cl
(b) N2 + HCl
(c) N2 + NH4Cl
(d) NCl3 + HCl

Answer: (c) N2 + NH4Cl

On addition of cone. H2SO4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet flames come out. This is because
(a) H2SO4 reduces HI to I2
(b) HI is of violet colour
(c) HI gets oxidised to I2
(d) HI changes to HIO3

Answer: (c) HI gets oxidised to I2

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?
(a) HF
(b) HCl
(c) HBr
(d) HI

Answer: (a) HF

The structure of white phosphorus is
(a) square-planar
(b) pyramidal
(c) tetrahedral
(d) trigonal planar

Answer: (c) tetrahedral

The increasing order of reducing power of the halogen acids is
(a) HF < HCl < HBr < HI
(b) HI < HBr < HCl < HF
(c) HBr < HCl < HF < HI
(d) HCl < HBr < HF < HI

Answer: (a) HF < HCl < HBr < HI

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250°C ?
(a) Nitric oxide
(b) Nitrous oxide
(c) Nitrogen dioxide
(d) Dinitrogen tetraoxide

Answer: (b) Nitrous oxide

The number of P-O-P bonds in cyclic metaphosphoric acid is
(a) 2
(b) 0
(c) 3
(d) 4

Answer: (a) 2

Which one of the following elements is found in free state in nature?
(a) Sodium
(b) Iron
(c) Zinc
(d) Gold

Answer: (d) Gold

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