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Free download in PDF Short Questions with Answers on Class 12 Chemistry Chapter 7 p Block Elements for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
On heating NaCl + K2 Cr2O7 + Conc. H2SO4, we get
[A]
O2
[B]
Cl2
[C]
CrOCl2
[D]
CrO2Cl2
(2)
Amongst LiCl , RbCl , BeCl2 & MgCl2 , max. & min. ionic character will be shown by
[A]
LiCl , MgCl2
[B]
RbCl , BeCl2
[C]
RbCl , MgCl2
[D]
MgCl2,BeCl2
(3)
Which of following chloride is water insoluble
[A]
HCl
[B]
AgCl
[C]
both 'a' & b
[D]
None
(4)
The alkali metal halide are soluble in water but LiF is insoluble because
[A]
It's Amphoteric
[B]
Li -F is highly ionic
[C]
It's Lattice energy is high
[D]
Li+ ion is least hydrated
Answer: It's Lattice energy is high
(5)
Which of following is present as an active ingredient in bleaching powder for bleaching action
[A]
CaCl2
[B]
CaOCl2
[C]
Ca(OCl)2
[D]
CaO2Cl
(6)
ClO2 reacts with O3 to give
[A]
Cl2O4
[B]
Cl2O
[C]
Cl2O6
[D]
ClO4
(7)
Bad conductor Of electricity is
[A]
H2F2
[B]
HCl
[C]
HBr
[D]
HI
(8)
When KBr is treated with concentrated H2SO4 redish brown gas evolved, gas is
[A]
Mixture of Br & HBr
[B]
Bromine & HNO3
[C]
Bromine
[D]
None of these
(9)
Which of following outter electronic configuration represents Ar?
[A]
ns2
[B]
ns2 np6
[C]
ns2 np5
[D]
ns2 np4
(10)
Which mineral was used in isolation of radium?
[A]
Lime stone
[B]
Pitch blende
[C]
Rectile
[D]
Haematite
(11)
Molecules of noble gas do not posses vibrational energy bec. Noble gas is
[A]
Monoatomic
[B]
Chemically inert
[C]
Complete filled shells
[D]
Is diatomic
(12)
Argon was discovered by
[A]
Rayleigh
[B]
Frankland & Lockyer
[C]
Jansen
[D]
Ramsay
(13)
The colour discharge tubes for advertisement mainly contain
[A]
Argon
[B]
Neon
[C]
Helium
[D]
Xenon
(14)
Least chemical activity is shown by
[A]
Nitrogen
[B]
Argon
[C]
Methane
[D]
Xenon
(15)
Noble gases do not react with other elements because
[A]
They have completely paired up & stable e - configuration
[B]
Their size is very small
[C]
Are monoatomic
[D]
None of these
Answer: They have completely paired up & stable e - configuration
(16)
Monazite is source of
[A]
He
[B]
Kr
[C]
Ar
[D]
Ne
(17)
He is added to oxygen supply used by deep sea divers because
[A]
It's less soluble in blood than Nitrogen at high pressure
[B]
It is Lighter than Nitrogen
[C]
It is readily miscible in oxygen
[D]
It is less poisionous than Nitrogen
Answer: It's less soluble in blood than Nitrogen at high pressure
(18)
Which of following is not correct for noblegas?
[A]
Ar is used in electric bulbs
[B]
Kr is obtained during radioactive disintegration
[C]
Half life of Rn is 3.8 days
[D]
He is used to produce Low temp
Answer: Kr is obtained during radioactive disintegration
(19)
Which of following represents noble gas configuration.
[A]
1S2, 2S2 2P6, 3S2 3P5
[B]
1S2, 2S2 2P6, 3S2 3P6
[C]
1S2, 2S2 2P6
[D]
1S2 , 2S2
Answer: 1S2, 2S2 2P6, 3S2 3P6
(20)
Which of following has zero valency
[A]
Sodium
[B]
Beryllium
[C]
Aluminium
[D]
Krypton
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