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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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