CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 15 - MCQExams.com

An inorganic compound (A)(A) made of two most occurring elements in the earth's crust and used in building construction when made to react with carbon, forms a poisonous gas (B)(B) which is most stable diatomic molecule. Compound (A)(A) and (B)(B) are:
  • SiO2,CO2SiO2,CO2
  • SiO2,COSiO2,CO
  • SiO2,N2SiO2,N2
  • CaO,CO2CaO,CO2
Silica is reacted with sodium carbonate. What is the gas liberated?
  • COCO
  • O2O2
  • CO2CO2
  • O3O3
2RCl+SiCu powder570 KR2SiCl2H2OR2Si(OH)2Polymerisation2RCl+SiCu powder−−−−−570 KR2SiCl2H2OR2Si(OH)2Polymerisation−−−−−−−− (A).(A)(A).(A) is:
  • cyclic silicone
  • cross linked silicone
  • linear silicone
  • none of these
Which one of the following is wrong?
  • Oxygen and sulphur belong to the same group of periodic table
  • Oxygen is a gas while sulphur is solid
  • Both show +2,+4+2,+4 and +6+6 oxidation states
  • H2SH2S has no hydrogen bonding
Which of the following is not correct?
  • Hydrolysis of NCl3NCl3 gives NH3NH3 and HClOHClO
  • NH3NH3 is less stable than PH3PH3
  • NH3NH3 is a weak reducing agent compared to PH3PH3
  • Nitric oxide in solid state exhibits diamagnetic property
Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of Xe in X is :
  • +2
  • +4
  • +6
  • 0
Na2B4O710H2ONa2B4O710H2O is correctly represented as:
  • 2NaBO2Na2B2O310H2O2NaBO2Na2B2O310H2O
  • Na2[B4O5(OH)4]8H2ONa2[B4O5(OH)4]8H2O
  • Na2[B4(H2O)4)O7]6H2ONa2[B4(H2O)4)O7]6H2O
  • all of the above
Bauxite ore is generally contaminated with impurity of oxides of two elements E1E1 and E2E2. Which of the following statements is correct?
  • E1E1 is a non-metal and belongs to 3rd period while E2E2 is a metal and belong to fourth period
  • One of the two oxides has three dimensional polymeric structure.
  • Both (A) and (B) are correct
  • None of the above
Inert pair effect is shown by:
  • RaRa
  • BiBi
  • PbPb
  • TlTl
Which of the following elements of matter would best convey that there is life on earth
  • Oxygen
  • Hydrogen
  • Carbon
  • Iron
Which of the following compounds of boron does not exist in the free form?
  • BCl3BCl3
  • BF3BF3
  • BBr3BBr3
  • BH3BH3
Carbon has zero oxidation number in________
  • COCO
  • CH4CH4
  • CH2Cl2CH2Cl2
  • CH3ClCH3Cl
Ca2B6O11+Na2CO3Δ[X]+CaCO3+NaBO2Ca2B6O11+Na2CO3Δ[X]+CaCO3+NaBO2 (unabalanced equation)
correct choice (s) for [X] is/are
  • Structure of anion of crystalline [X] has one born atom sp3sp3 hybridised and other three boron atoms sp2sp2 hybridised
  • X with NaOH (aq) gives a compound which on reaction with hydrogen peroxide in alkaline medium yields a compound used as brighter in soaps
  • hydrolysis of [X] with HCl or H2SO4H2SO4 yields a compound which on reaction with HF gives fluroboric acid.
  • [X] on heating with chromium salts in oxidising flame gives green coloured bead in cold.
The decrease stability of higher oxidation state in p-block with increasing atomic number is due to
  • Increase in bond energy as going down the group
  • Inert pair effect.
  • Both (A) and (B)
  • None is correct
On the addition of mineral acid to an aqueous solution of borax, the compound formed is 
  • Boro dihydride
  • Orthoboric acid
  • Metaboric acid
  • Pyroboric acid
Column-IColumn-II
A:HeA:Hei:i: High electron affinity
B:ClB:Clii:ii: Most electropositive element
C:CaC:Caiii:iii: Strongest reducing agent
D:LiD:Liiv:iv: Highest ionization energy
The correct match of contents in Column -I with those in Column -II is:
  • Aiii,Bi,Cii,DivAiii,Bi,Cii,Div
  • Aiv,Biii,Cii,DiAiv,Biii,Cii,Di
  • Ai,Bii,Ciii,DivAi,Bii,Ciii,Div
  • Aiv,Bi,Cii,DiiiAiv,Bi,Cii,Diii
  • Aii,Biv,Ci,DiiiAii,Biv,Ci,Diii
Which reagent is used to remove SO24SO24 and ClCl?
  • BaSO4
  • NaOH
  • Pb(NO3)2
  • KOH
In the electrothermal process, the compound displaced by silica from calcium phosphate is:
  • Calcium
  • Phosphine
  • Phosphorus
  • Phosphorus pentoxide
In laboratory silicon can be prepared by the reaction :
  • By heating Carbon in electric furnace
  • By heating Potassium with Potassium dichromate
  • Silica with Magnesium
  • None of these
Silica is added to roasted copper ore during smelting in order to remove
  • Cuprous sulphide
  • Cuprous oxide
  • Ferrous oxide
  • Ferrous sulphide
Which of the following compounds does not exist?
  • SbCl3
  • BiCl5
  • SbCl5
  • AsCl5
Which element froms maximum compound in chemistry?
  • O
  • H
  • Si
  • C
Composition of borax is 
  • Na2B4O7.4H2O
  • Na2B4O7.10H2O
  • NaBO2
  • Na2BO3
Silicon dioxide is formed by the reaction of 
  • SiCl4+H2O
  • SiO2+HF
  • SiO2+NaOH
  • SiCl4+NaOH

Match the column I with column II and mark the appropriate choice.
1843330_a4abeb64d8714417b2e58eb5d079d709.png
  • (A)(ii),(B)(iv),(C)(i),(D)(iii)
  • (A)(i),(B)(ii),(C)(iii),(D)(iv)
  • (A)(ii),(B)(iii),(C)(i),(D)(iv)
  • (A)(iii),(B)(i),C(ii),(D)(iv)
In which of the following the inert pair effect is most prominent ?
  • C
  • Ge
  • Si
  • Pb
Increasing order of stability of the +2 oxidation state of the ions ?
  • Ca2+<Ba2+<Sr2+
  • Pb2+<Ge2+<Sn2+
  • Ge2+<Sn2+<Pb2+
  • Cu2+<Au2+<Ag2+
Which of the following halides is inert towards hydrolysis at room temperature?
  • SiCl4
  • PCl3
  • NCl3
  • NF3
A cyclic skeleton of silicon and oxygen can constructed by the silicate ion composition :
  • Si2O47
  • Si2O25
  • SiO23
  • SiO44
Correct stability order of metal cation is/are :
  • Pb2+<Sn2+
  • Pb4+<Pb2+
  • Sn4+<Sn2+
  • Pb4+<Sn4+
There are three elements P, Q and R which belong to the p-block of periodic table they all form trifluorides with F2, such that PF3 is lewis acid but QF3 is weak lewis base (dipole moment 0.23D). These two compounds react with each other in presence of F2 to produce QF+4, PF4 The compound RF3 is a T-shape interhalogen molecule. Which of the following is an incorrect statement with reference to the above information? 
1950410_82dd82cb7e9d46a9b9397ca3b640150f.png
  • All the R-F bond lengths are equal in RF3 molecules
  • In the structure the angle A1800
  • The Q and P both are sp3 hybridised in QF+4, PF4
  • The elements P, Q, R can be B, N and Cl respectively
The incorrect order is:

  • N>P>As: Strength of π-bond with oxygen atom
  • SiF4>SiCl4>SiBr4>SiI4: Thermal stability
  • H2S>H2Se>H2Te: Arrhenious acid character
  • CaBr2>MgBr2>BeBr2: Melting point
0:0:3


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