P-Block Elements MCQs | P-Block Elements Short Questions and Answers

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Questions
41 The geometry of H2S and its dipole moment are:
A Angular and non zero
B Angular and zero
C Linear and zero
D Linear and non zero

Answer: Angular and non zero
42 H2S does not produce metallic sulphide with :
A CdCl2
B ZnCl2
C CoCl2
D CuCl2

Answer: ZnCl2
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43 In which reaction does SO2 act as oxidizing agent:
A Acidified KMnO4
B Acidified K2Cr2O7
C Acidified C2H5OH
D H2S

Answer: Acidified K2Cr2O7
44 In the laboratory H2S is prepared by the action of:
A Dilute H2SO4 on Fes
B Dilute H2SO4 on Sb2O3
C Hydrogen on sulphur
D Hydrogen on Sb2O3

Answer: Dilute H2SO4 on Fes
45 When SO2 is passed through a solution of H2S is water
A Sulphuric acid is formed
B A clear solution is formed
C Sulphur is precipitated
D No change is observed

Answer: Sulphur is precipitated
46 When SO2 gas is passed through an acidified solution of K2Cr2O7 :
A The solution become blue
B The solution become colourless
C SO2 is reduced
D Green Cr2(SO4) is formed

Answer: Green Cr2(SO4) is formed
47 H2SO4 is added while preparing a slandered solution of Mohr’s salt to prevent :
A Hydration
B Reduction
C Hydrolysis
D Complex formation

Answer: Hydrolysis
48 Red phosphorus is chemically uncreative because
A It does not contain P – P bonds
B It does not contain tetrahedral P4 molecules
C It does not catch fir e in air even up to 400ºC
D It has a polymeric structure

Answer: It has a polymeric structure
49 When water is added in con. H2SO4 the reactionis exotherimic because :
A H2SO4 is viscous
B Hydrates of H2SO4 are formed
C H2SO4 is corrosive
D All of these

Answer: Hydrates of H2SO4 are formed
50 There is no. S – S bond in:
A SO4–2
B S4O6–2
C S2O3–2
D S2O7–2

Answer: S2O7–2
51 Peroxy linkage is present in:
A Caro’s acid
B Pyrosulphuric acid
C Sulphurous acid
D Di thionic acid

Answer: Caro’s acid
52 Nitric acid (conc.) oxidizes phosphorus to :
A H3PO4
B P2O3
C H3PO3
D None of these

Answer: H3PO4
53 Phosphorus is manufactured by heating ____ in a furnace:
A Bone-ash, sodium chloride and coke
B Bond-ash, silica and coke
C Bone ash, silica and lime
D Bone-ash, coke and lime stone

Answer: Bone ash, silica and lime
54 Laboures’s working with phosphorus suffer from a disease in which bones decay, It is known as:
A Arthritis
B Phossy jaw
C Rickets
D Cancer

Answer: Rickets
55 Helium is added to oxygen used by deep sea divers because:
A It is less soluble in blood than nitrogen under high pressure
B It is lighter than nitrogen
C It is readily miscible with oxygen
D It is less poisonous than nitrogen

Answer: It is less soluble in blood than nitrogen under high pressure
56 XeF6 on complete hydrolysis gives:
A Xe
B XeO2
C XeO3
D XeO4

Answer: XeO3
57 Which of the following statement is not correct?
A Argon is used in electric bulb
B Krypton is obtained during radioactive disintegration
C Half life of radon is only 3.8 days
D Helium is used in producing very low temperatures

Answer: Helium is used in producing very low temperatures
58 Inert gases such as helium behave like ideal gases over a wide range of temperature. However they condense into the solid state at very low temperature there is a:
A Weak attractive forces between the atoms
B Weak repulsive force between the atoms
C Strong attractive force between the atoms
D Strong repulsive force between the atome

Answer: Strong attractive force between the atoms
59 The idea which prompted Barlett to prepare first ever compound of noble gas was:
A High bond energy of Xe-F
B Low bond energy of F – F in F2
C Ionization energy of O2 and xenon were almost similar
D None of these

Answer: None of these
60 A clatharate is defined as a:
A Cage compound
B Liquid crystal
C Mixture
D Solid solution

Answer: Cage compound

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