CBSE Class 11 Chemistry p-Block Elements MCQs Set B

Question. Which aluminium alloy is extremely light?
(a) Duralumin
(b) Alnico
(c) Magnalium
(d) Aluminium bronze

Question. Cupric oxide on heating with B₂O₃ yields blue colored beads in the oxidizing flame because
(a) Cupric borates are white in color
(b) Cupric borates are black in color
(c) Cupric borates are green in color
(d) Cupric borates are blue in color

Question. In mordenting aluminium ions (Al⁺³) are precipitated on the cloth as
(a) Al₂O3
(b) AlN
(c) Al(OH)₃
(d) AlCl₃

Question. Platinum metal can be dissolved in
(a) Hot con HCl
(b) Hot con H₂SO₄
(c) Hot con HNO₃
(d) A mixture of Con. HCl and con HNO₃

Question. Which of the following can form nitride, which react with water to give ammonia?
(a) Boron
(b) Gallium
(c) Indium
(d) Thallium

Question. The weak acid, which cannot be titrated with standard alkies, is
(a) HCl
(b) H₂SO₄
(c) H₃BO₃
(d) All of these

Question. Carbon differs from other members of its group due to smaller atomic size,higher electro negativity and the absence of
(a) s – electrons
(b) p – electrons
(c) d – electrons
(d) All of these

Question. Aqua regia is a mixture of concentrated HNO₃ and concentrated HCl in the ratio of
(a) 3 : 1
(b) 1 : 3
(c) 2 : 3
(d) 3 : 2

Question. In land storage batteries, the acid used is
(a) Con HCl
(b) Dil.HCl
(c) Con H₂SO₄
(d) Dil H₂SO₄

Question. The dry ice is a compound of
(a) Solid ice with any water
(b) Solid SO₂
(c) Solid CO₂
(d) Solid C₆H₆

Question. In the contact process for the manufacturing of H₂SO₄, the catalyst used is
(a) Cu
(b) Ni
(c) Pt
(d) N₂O₅

Question. The depositing layer in tin plating is
(a) Cu
(b) Sn 
(c) Al
(d) Ni

Question. Ortho boric acid on heating at 100^oC yields
(a) Meta boric acid
(b) Pyroboric acid
(c) Tetra boric acid
(d) Boric anhydride acid (B₂O₃)

Question. Which of the following is used in photographic film?
(a) MgBr₂
(b) NaCl
(c) AgBr
(d) Na₂S₂O₃

Question. Aluminum does not react with HNO₃ at any concentration and therefore HNO₃ is transported in aluminum containers, this is due to formation of protective layer of
(a) Cupric oxide
(b) Ferric oxide
(c) Aluminum oxide
(d) Aluminum nitride

Question. Action of aqua regia on noble metals is due to
(a) HNO₃
(b) HCl
(c) H₂SO₄
(d) Chlorine

Question. Phosgene is a poisonous gas, its chemical name is
(a) Carbon dioxide
(b) Phosphonyl chloride
(c) Carbon monoxide
(d) Carbonyl chloride

Question. The maximum inert pair effect is shown by
(a) B
(b) Al
(c) Ga
(d) Tl

Question. Quartz is the polymeric form of
(a) (SiO₂)n
(b) (CO₂)n
(c) (CH₂ – CH₂)n
(d) None of these

Question. If a metal is protected by an oxide layer from further attack, the metal is said to be
(a) Reactive
(b) Active
(c) Passive
(d) Attractive

Question. Carbon reacts with metals to form
(a) Hydrides
(b) Oxides
(c) Hydroxides
(d) Carbide

Question. The control addition of III A and IV A members in Silicon and Germanium is known as
(a) Inert pair effect
(b) Doping
(c) Litharge
(d) Red lead

Question. P – type of semi conductor are formed by mixing Silicon or Germanium with members of
(a) III A
(b) IV A
(c) V A
(d) VI A

Question. Litharge is chemically
(a) PbO
(b) PbO₂
(c) Pb₃O₄
(d) Pb(CH₃COO)

Question. The Octet rule is not followed by
(a) Boron on BCl₃
(b) Oxygen in H₂O
(c) Nitrogen in NH₃
(d) Phosphorus in PH₃

Question. Which of the following elements show oxidation state of + 3 only?
(a) B
(b) Ga
(c) In
(d) Ti

Question. ______ of the following is not metallic in nature.
(a) Boron
(b) Aluminum
(c) Indium
(d) Thallium

Question. The oxides of Boron are ______ in nature.
(a) Acidic
(b) Basic
(c) Neutral
(d) None of these

Question. Orthoboric acid on heating to about 100^oC looses a water molecule to form ______
(a) Metaboric acid
(b) Pyroboric acid
(c) Metaboric and pyroboric acid
(d) None of these

Question. The function of Fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite (NA₃ AlF₆) is
(a) As a catalyst
(b) To lower the temperature of the melt and to make the fused mixture conducting.
(c) To decrease the rate of oxidation of carbon at the anode.
(d) None of the above

Question. Which of the following statements is correct?
(a) H₃PO₃ is dibasic and reducing
(b) H₃PO₃ is tribasic and reducing
(c) H₃PO₃ is tribasic and non – reducing
(d) H₃PO₃ is dibasic and non – reducing

Question. Boric acid is
(a) Weak monobasic Lewis acid
(b) Only weak monobasic Arhenius acid
(c) Only weak monobasic Bronsted acid
(d) Only weak tribasic Arrhenius acid

Question. The reduction of metal oxides is sometimes accomplished by using aluminum in the
(a) Goldschmidt’s reaction
(b) Silberchemdit’s reaction
(c) Baeyer’s reaction
(d) Zilch’s reaction

Question. Hall’s process is based on electrolysis of
(a) Alumina
(b) Gypsum
(c) Borax
(d) None of these

Question. _______ is a better conductor of heat.
(a) Fe
(b) Sn
(c) Al
(d) None of these

Question :  The non-metal oxides are ____x____ whereas metal oxides are ___y ____ in nature.