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Free download in PDF P-Block Elements Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, NEET, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
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
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
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
51
Peroxy linkage is present in:
[A]
Caro’s acid
[B]
Pyrosulphuric acid
[C]
Sulphurous acid
[D]
Di thionic acid
52
Nitric acid (conc.) oxidizes phosphorus to :
[A]
H3PO4
[B]
P2O3
[C]
H3PO3
[D]
None of these
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
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
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
60
A clatharate is defined as a:
[A]
Cage compound
[B]
Liquid crystal
[C]
Mixture
[D]
Solid solution
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