CBSE Questions for Class 11 Medical Chemistry Hydrogen Quiz 11 - MCQExams.com

In transforming $$0.01\ mole$$ of $$PbS$$ to $$PbSO_{4}$$, the volume of $$10$$ volume $$H_{2}O_{2}$$ required will be:
  • $$11.2\ mL$$
  • $$22.4\ mL$$
  • $$33.6\ mL$$
  • $$44.8\ mL$$
Why is water a bent molecule and not linear?
  • Water has four electron domains repelling each other, causing the molecule to be bent.
  • There are not enough electrons involved for the molecule to be linear.
  • Because the oxygen in water can only make bent molecules.
  • The molecule alternates in between a bent geometry and a linear geometry.
Hydorgen forms binary compounds called hydrides with several elements in the periodic table.Regarding these hydrides the wrong statement:
  • Among lanthanoids, europioum and ytterbium form ionic hydrides.
  • The density of ionic hydrides is less, while the density of interstitial hydrides is more than the metals from which they are formed.
  • The rate of reaction of alkali metals towards hydrogen decreases from lithium to caesium
  • Hydrogen gas can be purified by the phenomenon of occlusion of hydrogen by palladium metal.
Which of the following hydrolysis reaction is incorrect at moderate temperature?
  • $$4BF_{3} + 3H_{2}O \rightarrow H_{3}BO_{3} + 3HBF_{4}$$
  • $$2NF_{3} + 3H_{2}O\rightarrow N_{2}O_{3} + 6HF$$
  • $$NCl_{3} + 3H_{2}O\rightarrow NH_{3} + HOCl$$
  • $$BiCl_{3} + H_{2}O\rightarrow BiOCl\downarrow + 2HCl$$
What is the reaction given below, called?
$$H_{2}O_{(l)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + OH^{-}_{(aq)}$$
  • Hydrolysis of water
  • Hydration of water
  • Disproportionate of water
  • Auto-protolysis of water
What willl be the mass of oxygen liberated by decomposition of 200 mL hydrogen peroxide solution with a strength of 34 g per litre? 
  • 25.5g
  • 3.0g
  • 3.2g
  • 4.2g
The various types of hydrides and examples of each type are given below.
Hydride typeCompound
(A)Electron deficient(i)$$LiH$$
(B)Saline(ii)$$CH_{4}$$
(C)Electrons-precise(iii)$$NH_{3}$$
(D)Interstitial(iv)$$B_{2}H_{6}$$
(E)Electron rich(v)$$CrH$$
  
Choose the correct matching from the codes given below.
  • $$(A) - (ii), (B) - (iv), (C) - (v), (D) - (iii), (E) - (i)$$
  • $$(A) - (iv), (B) - (i), (C) - (ii), (D) - (v), (E) - (iii)$$
  • $$(A) - (iv), (B) - (iii), (C) - (v), (D) - (ii), (E) - (i)$$
  • $$(A) - (v), (B) - (iii), (C) - (iv), (D) - (ii), (E) - (i)$$
  • $$(A) - (iv), (B) - (v), (C) - (i), (D) - (ii), (E) - (iii)$$
The standard potential of the reaction: $$H_2O+e^-\rightarrow\dfrac{1}{2}H_2+OH^-$$ at 298 K by using $$ K_w(H_2 O)=10^{-14}$$.
  • -0.828 V
  • 0.828 V
  • 2.0 V
  • -0.5 V
Hydrogen gas is obtained from:
  • petroleum
  • coal
  • coke
  • natural gas
Ionic hydride reacts with water to give:
  • hydride ions
  • acidic solution
  • protons
  • basic solution
Which of the following is laboratory preparation of dihydrogen?
  • $$3Fe + 4H_{2} O (steam) \rightarrow Fe_{3} O_{4} + 4H_{2}$$
  • $$2Na + 2H_{2}O \rightarrow 2NaOH + H_{2}$$
  • $$CaH_{2} + 2H_{2}O\rightarrow Ca(OH)_{2} + 2H_{2}$$
  • $$Zn + H_{2}SO_{4} (dil.) \rightarrow ZnSO_{4} + H_{2}$$
$$H_{2}$$ gas is liberated at cathode and anode both by electrolysis of the given aq. solution except:
  • $$NaH$$
  • $$HCOONa$$
  • $$CaH_{2}$$
  • $$LiH$$
Which of the following is most soluble in water?
  • $${ CsClO }_{ 4 }$$
  • $${ NaClO }_{ 4 }$$
  • $${ KClO }_{ 4 }$$
  • $${ LiClO }_{ 4 }$$
The order of reactivity of halogens towards hydrogen is:
  • $$F_{2} > Cl_{2} > Br_{2} > I_{2}$$
  • $$I_{2} > Br_{2} > Cl_{2} > F_{2}$$
  • $$Cl_{2} > Br_{2} > I_{2} > F_{2}$$
  • $$Br_{2} > Cl_{2} > F_{2} > I_{2}$$
Which of the following statements regarding hydrides iis not correct?
  • Ionic hydrides are crystalline, non-volatile and non-conducting in solid state
  • Electron-deficient hydrides act as Lewis acids or electron acceptors
  • Elements of group$$-13$$ form electron-deficient hydride
  • Elements of group $$15-17$$ form electron-precise hydrides
Which of the following ions forms a hydroxide that is highly soluble in water?
  • $$K^{+}$$
  • $$Zn^{2+}$$
  • $$Ni^{2+}$$
  • $$Al^{3+}$$
The production of dihydrogen obtained from coal gasification can be increased by reacting carbon monoxide of syngas mixture with steam in presence of a catalyst iron-chromium. What is this process called?
  • Hydrogen reaction
  • Water-gas shift reaction
  • Coal-gas shift reaction
  • Syn gasification
Hydrogen peroxide oxidises $$[Fe(CN)_6]^{4-}$$ to $$[Fe(CN)_6]^{3-}$$ in acidic medium but reduce $$[Fe(CN)_6]^{3-}$$ to $$[Fe(CN)_6]^{4-}$$ in alkaline medium. The other products formed are, respectively:
  • $$H_2O$$ and $$(H_2O + O_2)$$
  • $$H_2O $$ and $$(H_2O + OH^-)$$
  • $$(H_2O + O_2)$$ and $$H_2O$$
  • $$(H_2O + O_2)$$ and $$(H_2O + OH^-)$$
Given below are two reaction of water with sodium and carbon dioxide, what is the nature of water in these reaction?
(i)$$2Na+2H_2O\rightarrow 2NaOH +H_2$$
(ii)$$6CO_2+12H_2O\rightarrow C_6H_12_6+6H_2O+6O_2$$
  • In (ii) water acts as an oxidising agent and in (i) it acts as a reducing agent
  • In (i) water acts as an oxidising agent and in (ii) it acts as a reducing agent
  • In both (i) and (ii) hydrogen acts as a reducing agent
  • In both (i) and (ii) hydrogen acts as an oxidizing agent
Which of the following is not a process of preparation of hydrogen peroxide? 
  • Auto-oxidation of 2-ethylanthraquinol.
  • By passing oxygen through boiling water
  • By oxidation of isopropyl alcohol
  • By reaction of barium peroxide with dil. $$H_2SO_4$$
Study the following reactions and mark the correct properties shown by water :
(i) $$SO_{3} + H_{2}O \rightarrow H_{2}SO_{4}$$
(ii) $$Cl_{2}O_{7} + H_{2}O \rightarrow  2HClO_{4}$$
(iii)$$Na_{2}O + H_{2}O \rightarrow 2NaOH $$
(iv)$$CaO + H_{2}O \rightarrow Ca (OH)_{2}$$
  • All oxides react with water to give hydroxides
  • Acidic oxides are formed by metals and basic oxides by non-metals
  • Non-metal oxides combine with water to form acids while metallic oxides combine with water to form alkalies
  • Acidic oxides are stronger than basic oxides since they form strong acids
Match the reactions of column I with their types given in column II and mark the appropriate choice. 
Column I Column II
A$$H_{2}O + NH_{3} \rightleftharpoons NH^{+}_{4} + OH$$iSelf ionisation of $$H_{2}O$$
B$$FeCl_{3} + 3H_{2}O \rightarrow Fe (OH)_{3} + 3HCl $$iiDecomposition 
C$$H_{2}O + H_{2}O \rightleftharpoons H_{3}O^{+} + OH$$iiiAcidic nature of $$H_{2}O$$
D$$2H_{2}O \rightarrow  2H_{2} + O_{2}$$ivHydrolysis
  • (A)$$\rightarrow $$(ii), (B) $$\rightarrow $$(i), (C)$$\rightarrow $$(iii), (D)$$\rightarrow$$ (iv)
  • (A)$$\rightarrow $$(iii), (B)$$ \rightarrow $$(ii), (C)$$\rightarrow$$ (iv), (D)$$\rightarrow $$(i)
  • (A)$$\rightarrow$$  (i), (B) $$\rightarrow$$  (ii), (C)$$\rightarrow $$(iv), (D)$$\rightarrow$$ (iii)
  • (A)$$\rightarrow$$  (iii), (B)$$ \rightarrow $$(iv), (C)$$\rightarrow$$ (i), (D)$$\rightarrow $$(ii)
Which of the following reagents cannot be used for the preparation of hydrogen peroxide? 
  • Sodium peroxide
  • 2- Ethylanthraquinol
  • Sodium thiosulphate
  • Barium Peroxide
A commercial sample of hydrogen peroxide is labelled as $$10$$ volume. Its percentage strength is nearly ?
  • $$3\%$$
  • $$1\%$$
  • $$90\%$$
  • $$10\%$$
Match the column I with column II and mark the appropriate choice.
column Icolumn II
ANaHiInterstitial hydride 
B$$CH_{4}$$iiMolecular hydride
C$$VH_{0.56}$$iiiIonic hydride 
D$$B_{2}H_{6}$$iv Electron-deficient hydride 
  • $$(A)\rightarrow (iii), (B)\rightarrow (iv), (C)\rightarrow (ii) (D)\rightarrow (i)$$
  • $$(A)\rightarrow (ii), (B)\rightarrow (iv), (C)\rightarrow (iii) (D)\rightarrow (i)$$
  • $$(A)\rightarrow (i), (B)\rightarrow (ii), (C)\rightarrow (iv) (D)\rightarrow (iii)$$
  • $$(A)\rightarrow (iii), (B)\rightarrow (ii), (C)\rightarrow (i) (D)\rightarrow (iv)$$
Water plays a key role in the biosphere, It is due to certain properties of $$H_2O$$ as compared to other liquids. These are except:
  • higer specific heat
  • lesser thermal conductivity
  • high dielectric constant
  • high surface tension
Which of the following represents the chemical equation involved in the preparation of $$H_2O_2$$ from barium peroxide?
  • $$BaO_2.8H_2O+H_2SO_4\rightarrow BaSO_4+H_2O_2+8H_2O$$
  • $$CH_3CHOHCH_3\rightarrow CH_3COOCH_3+H_2O_2$$
  • $$BaO_2+CO_2+H_2O\rightarrow BaCO_3+H_2O_2$$
  • $$Ba_3(PO_4)_2+3H_2SO_4\rightarrow 3BaSO_4+2H_3PO_4$$
What will be the strength of 20 vol of $$H_2O_2$$ in terms of gram per litre?
  • $$60.71g L^{-1}$$
  • $$5.6g L^{-1}$$
  • $$30.62g L^{-1}$$
  • $$17g L^{-1}$$
$$ 5.0 cm^3 of H_2O_2 $$  liberates 0.508 g of iodine from an acidified KI solution. The strength of $$H_2O_2$$ solution in terms of volume strength at STP is:
  • 6.48 volumes
  • 4.48 volumes
  • 7.68 volumes
  • none of these
Metal hydrides are ionic, covalent or molecular in nature. Among $$LiH,\ NaH,\ KH,\ RbH$$ and $$ CsH$$, the correct order of increasing ionic character is:
  • $$LiH > NaH > CsH > KH > RbH$$
  • $$LiH < NaH < KH < RbH < CsH$$
  • $$RbH > CsH > NaH > KH > LiH$$
  • $$NaH > CsH > RbH > LiH > KH$$
Two structure of $$H_2O_2$$are drawn below. Identify the phase $$(X)$$ and $$(Y)$$ of $$H_2O_2$$.
927285_011c6364e01944c1b0d06b1ec9326b82.png
  • $$(X)$$ is the structure of $$H_2O_2$$ in gas phase and $$(Y)$$ in solid phase
  • $$(X)$$ is structure of $$H_2O_2$$ in solid phase and $$(Y)$$ in gas phase
  • $$(X)$$ and $$(Y)$$ are structures of $$H_2O_2$$ in gas phase
  • $$(X)$$ and $$(Y)$$ are structures of $$H_2O_2$$ in solid phase
When $$ NaBH_{4} $$ is dissolves in water
  • It decomposes with the evolution of $$ H_{2} $$
  • $$ Na^{+} $$ and $$ BH^{-}_{4} $$ are formed which are stable
  • $$ BH^{-}_{4} $$ ions formed initially decompose to produce $$ OH^{-} $$ ions, which prevent future decomposition
  • $$NaH$$ and $$ B_{2}H_{6} $$ are produced
Which of the following reactions increases production of dihydrogen from synthesis gas? 
  • $$CH_4(g) + H_2O(g) \xrightarrow[Ni]{1270K} CO(g) + 3H_2(g$$)
  • $$C(s) + H_2O(g) \overset{1270K}{\rightarrow} CO(g) + H_2(g)$$
  • $$CO(g) + H_2O(g) \xrightarrow[Catalyst]{673 K} CO_2(g) + H_2(g)$$
  • None of the above
Which of the following information is true for structure of $$H_2O_2$$ in solid phase? 
Strength of 10 volume hydrogen peroxide solution is:
  • $$30.35\ g\ L^{-1}$$
  • $$17\ g\ L^{-1}$$
  • $$34\ g\ L^{-1}$$
  • $$68\ g\ L^{-1}$$
HOTS 
The various types of hydrides and examples of each type are given below : 
      Hydride type                                         Compound
A Electron deficient                         i    LiH
B Saline                                          ii    $$CH_{4}$$
C Electron-precise                         iii    $$NH_{3}$$
D Interstitial                                    iv    $$B_{2}H_{6}$$
E Electron rich                                v     CrH
Choose the correct matching from the code given below :
  • (A)- (ii), (B) - (iv), (C) - (v), (D) - (iii), (E) - (i)
  • (A)- (iv), (B) - (i), (C) - (ii), (D) - (v), (E) - (iii)
  • (A)- (iv), (B) - (iii), (C) - (v), (D) - (ii), (E) - (i)
  • (A)- (v), (B) - (iii), (C) - i(v), (D) - (ii), (E) - (i)
Match list I with list II. Choose the correct matching codes from the choices given. 
     List I                                                 List II
   (Hydride)                                    (Type of hydride)
A. $$BeH_{2}$$                        1.  Complex
B.. $$AsH_{3}$$                       Lewis acid
C. $$B_{2}H_{6}$$                   Interstitial
D. $$LaH_{3}$$                        Covalent
E. $$LiAlH_{4}$$                     Intermediate
  • A-6, B-2, C-4, D-5, E-1
  • A-6, B-2, C-4, D-3, E-1
  • A-6, B-4, C-2, D-3, E-15
  • A-5, B-4, C-2, D-3, E-1
The enthalpy change on freezing of 1 mol of water at $$5^oC$$ to ice at $$-5^oC$$ is:
$$[{ Given:\quad \triangle  }_{ fus }H=6kJ{ mol }^{ -1 }at\ 0^oC,\ { C }_{ p }\left( { H }_{ 2 }O,l \right) =75.3J{ mol }^{ -1 }{ K }^{ -1 },{ C }_{ p }\left( { H }_{ 2 }O,s \right)$$$$=36.8J{ mol }^{ -1 }{ K }^{ -1 }]$$
  • $$-6.56kJ{ mol }^{ -1 }$$
  • $$-5.81kJ{ mol }^{ -1 }$$
  • $$-6.00kJ{ mol }^{ -1 }$$
  • $$-5.44kJ{ mol }^{ -1 }$$
Which of the following will give $${H}_{2}$$ gas with dilute $${HNO}_{3}$$?
  • $$Mg$$
  • $$Zn$$
  • $$Cu$$
  • $$Hg$$
Hydrogen peroxide is obtained by the electrolysis of:
  • water
  • sulphuric acid
  • hydrochloric acid
  • fused sodium peroxide
Industrially, $${ H }_{ 2 }{ O }_{ 2 }$$ is obtained by the following cyclic process :
$$\begin{matrix} 2-Ethylanthraquinol \\ (P) \end{matrix}\overset { { O }_{ 2 } }{ \underset { { H }_{ 2 }/Pd }{ \rightleftharpoons  }  } \begin{matrix} 2-Ethylanthraquinone \\ (Q) \end{matrix}+{ H }_{ 2 }{ O }_{ 2 }$$
Which one of the following properties is wrong about the mixture of organic solvents in which the reaction is carried out?
  • It must resist oxidation.
  • It must be miscible with water.
  • It must dissolve both (P) and (Q).
  • It is generally a mixture of ester and hydrocarbon.
Volume strength of $$500ml$$ solution containing $$3.4gm$$ of $${H_2}{O_2}$$ is
  • $$11.2$$
  • $$6.8$$
  • $$1.12$$
  • $$2.24$$
A commercial  sample of $${H_2}{O_2}$$ marked as 100 volume hydrogen peroxide, it means that
  • $${\rm{1}}\,\,{\rm{mL}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{give}}\,{\rm{100}}\,{\rm{mL}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$
  • $${\rm{1}}\,\,{\rm{L}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{will}}\,{\rm{give}}\,{\rm{100}}\,{\rm{mL}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$
  • $${\rm{1}}\,\,{\rm{L}}\,{\rm{of}}\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,{\rm{will}}\,{\rm{give}}\,\ {\rm{22}}{\rm{.4L}}\,{\rm{}}\ {{\rm{O}}_{\rm{2}}}\,{\rm{at}}\,{\rm{STP}}$$
  • None of these
$$H_2O_2$$ can be estimated by
  • Titration with acidified $$K_2Cr_2O_7$$
  • Titration with $$NaOH$$ solution
  • Titration with acidified $$KMnO_4$$ solution
  • Titration with $$Na_2CO_3$$ solution
Which one of the following metals cannot evolve $$H_{2}$$ from acids or $$H_{2}O$$ or from its compounds? 
  • Hg
  • Al
  • Pb
  • Fe
When barium chloride solution is added to sodium sulphate solution, a white precipitate is formed. The white precipitate is:
  • Barium chloride
  • Sodium sulphate
  • Barium sulphate
  • Sodium chloride
Hydrogen does not combine with ______.
  • Sb
  • Na
  • He
  • Zn
Enthalpy of vapourisation for water is $$186.5kJ$$ $${mol}^{-1}$$. The entropy change during vapourisation is _____ $$kJ{K}^{-1}{mol}^{-1}$$
  • $$0.5$$
  • $$1.0$$
  • $$1.5$$
  • $$2.0$$
Which is correct order of BP of VA , VIA and VIIA hydrides: 
  • $$SbH_3 > NH_3 > AsH_3 > PH_3$$
  • $$H_2 O > H_2 Te > H_2Se > H_2S$$
  • $$HF > HI > HBr > HCl$$
  • All correcct
Industrially $$H_2O_2$$ is produced
  • By oxidation of 2 ethyl anthraquinone in and cyclic process
  • By partial oxidation of propane2 ol
  • Both
  • None
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