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

An inorganic compound $$(A)$$ 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 $$(B)$$ which is most stable diatomic molecule. Compound $$(A)$$ and $$(B)$$ are:
  • $$SiO_2, CO_2$$
  • $$SiO_2, CO$$
  • $$SiO_2, N_2$$
  • $$CaO, CO_2$$
Silica is reacted with sodium carbonate. What is the gas liberated?
  • $$CO$$
  • $$O_2$$
  • $$CO_2$$
  • $$O_3$$
$$2RCl+Si\xrightarrow [ 570\ K ]{ Cu\ powder } { R }_{ 2 }{ SiCl }_{ 2 }\xrightarrow [  ]{ { H }_{ 2 }O } { R }_{ 2 }Si{ (OH) }_{ 2 }\xrightarrow [  ]{ Polymerisation } $$ $$(A). (A)$$ 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 $$+2,+4$$ and $$+6$$ oxidation states
  • $$H_{2}S$$ has no hydrogen bonding
Which of the following is not correct?
  • Hydrolysis of $$NCl_3$$ gives $$NH_3$$ and $$HClO$$
  • $$NH_3$$ is less stable than $$PH_3$$
  • $$NH_3$$ is a weak reducing agent compared to $$PH_3$$
  • 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
$${Na}_{2}{B}_{4}{O}_{7}\cdot{10H}_{2}O$$ is correctly represented as:
  • $${2NaBO}_{2}\cdot{Na}_{2}{B}_{2}{O}_{3}\cdot{10H}_{2}O$$
  • $${Na}_{2}\left[{B}_{4}{O}_{5}\left(OH\right)_{4}\right]\cdot{8H}_{2}O$$
  • $${Na}_{2}\left[{B}_{4}\left(H_{2}O\right)_{4}\right){O}_{7}]\cdot{6H}_{2}O$$
  • all of the above
Bauxite ore is generally contaminated with impurity of oxides of two elements $${E}_{1}$$ and $${E}_{2}$$. Which of the following statements is correct?
  • $${E}_{1}$$ is a non-metal and belongs to 3rd period while $${E}_{2}$$ 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:
  • $$Ra$$
  • $$Bi$$
  • $$Pb$$
  • $$Tl$$
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?
  • $$BCl_3$$
  • $$BF_3$$
  • $$BBr_3$$
  • $$BH_3$$
Carbon has zero oxidation number in________
  • $$CO$$
  • $${CH}_{4}$$
  • $${CH}_{2}{Cl}_{2}$$
  • $${CH}_{3}Cl$$
$$ Ca_{2}B_{6}O_{11}+Na_{2}CO_{3}\overset{\Delta }{\rightarrow} \left [ X \right ]+CaCO_{3}+NaBO_{2} $$ (unabalanced equation)
correct choice (s) for [X] is/are
  • Structure of anion of crystalline [X] has one born atom $$ sp^{3} $$ hybridised and other three boron atoms $$ sp^{2} $$ 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 $$ H_{2}SO_{4} $$ 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
$$A: He$$$$i: $$ High electron affinity
$$B: Cl$$$$ii:$$ Most electropositive element
$$C: Ca$$$$iii:$$ Strongest reducing agent
$$D: Li$$$$iv:$$ Highest ionization energy
The correct match of contents in Column -I with those in Column -II is:
  • $$A-iii, B-i, C-ii, D-iv$$
  • $$A-iv, B-iii, C-ii, D-i$$
  • $$A-i, B-ii, C-iii, D-iv$$
  • $$A-iv, B-i, C-ii, D-iii$$
  • $$A-ii, B-iv, C-i, D-iii$$
Which reagent is used to remove $$SO_{4}^{2-}$$ and $$Cl^{-}$$?
  • $$BaSO_{4}$$
  • $$NaOH$$
  • $$Pb(NO_{3})_{2}$$
  • $$KOH$$
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?
  • $$SbCl_3$$
  • $$BiCl_5$$
  • $$SbCl_5$$
  • $$AsCl_5$$
Which element froms maximum compound in chemistry?
  • O
  • H
  • Si
  • C
Composition of borax is 
  • $$Na_2B_4O_7.4H_2O$$
  • $$Na_2B_4O_7.10H_2O$$
  • $$NaBO_2$$
  • $$Na_2BO_3$$
Silicon dioxide is formed by the reaction of 
  • $$SiCl_{4}+H_{2}O$$
  • $$SiO_{2}+HF$$
  • $$SiO_{2}+NaOH$$
  • $$SiCl_{4}+NaOH$$

Match the column I with column II and mark the appropriate choice.
1843330_a4abeb64d8714417b2e58eb5d079d709.png
  • $$(A) \rightarrow (ii), (B) \rightarrow (iv), (C) \rightarrow (i), (D) \rightarrow (iii)$$
  • $$(A) \rightarrow (i), (B) \rightarrow (ii), (C) \rightarrow (iii), (D) \rightarrow (iv)$$
  • $$(A) \rightarrow (ii), (B) \rightarrow (iii), (C) \rightarrow (i), (D) \rightarrow (iv)$$
  • $$(A) \rightarrow (iii), (B) \rightarrow (i), C \rightarrow (ii), (D) \rightarrow (iv)$$
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 ?
  • $$Ca^{2+} < Ba^{2+} < Sr^{2+}$$
  • $$Pb^{2+} < Ge^{2+} < Sn^{2+}$$
  • $$Ge^{2+} < Sn^{2+} < Pb^{2+}$$
  • $$Cu^{2+} < Au^{2+} < Ag^{2+} $$
Which of the following halides is inert towards hydrolysis at room temperature?
  • $$SiCl_4$$
  • $$PCl_3$$
  • $$NCl_3$$
  • $$NF_3$$
A cyclic skeleton of silicon and oxygen can constructed by the silicate ion composition :
  • $$Si_{2}O_{7}^{4-}$$
  • $$Si_{2}O_{5}^{2-}$$
  • $$SiO_{3}^{2-}$$
  • $$SiO_{4}^{4-}$$
Correct stability order of metal cation is/are :
  • $$Pb^{2+} < Sn^{2+}$$
  • $$Pb^{4+} < Pb^{2+}$$
  • $$Sn^{4+} < Sn^{2+}$$
  • $$Pb^{4+} < Sn^{4+}$$
There are three elements P, Q and R which belong to the p-block of periodic table they all form trifluorides with $$F_2$$, such that $$PF_3$$ is lewis acid but $$QF_3$$ is weak lewis base (dipole moment 0.23D). These two compounds react with each other in presence of $$F_2$$ to produce $$QF^+_4$$, $$PF^-_4$$ The compound $$RF_3$$ 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 $$RF_3$$ molecules
  • In the structure the angle $$ A \neq 180^0$$
  • The Q and P both are $$sp^3$$ hybridised in $$QF^+_4$$, $$PF^-_4$$
  • The elements P, Q, R can be $$B$$, $$N$$ and $$Cl$$ respectively
The incorrect order is:
  • $$N > P > As :$$ Strength of $$\pi$$-bond with oxygen atom
  • $$SiF_{4} > SiCl_{4} > SiBr_{4} > SiI_{4} :$$ Thermal stability
  • $$H_{2}S > H_{2}Se > H_{2}Te :$$ Arrhenious acid character
  • $$CaBr_{2} > MgBr_{2} > BeBr_{2} :$$ Melting point
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