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Free download in PDF P-Block Elements Objective Type 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.
(21)
NH3 gas is dried over:
[A]
Anhydrous CaCl2
[B]
P2O5
[C]
Quick lime
[D]
Conc. H2SO4
(22)
Fertilizer having the highest nitrogen percentage is:
[A]
Calcium cynamide
[B]
Urea
[C]
Ammonium nitrite
[D]
Zammonium sulphate
Answer: Zammonium sulphate
(23)
In the upper layers of atmosphere ozon is formed:
[A]
By action of electric discharge on oxygen molecule
[B]
By action of ultraviolet rays on oxygen molecule
[C]
By action of infrared rays on oxygen molecule
[D]
Due to sudden drops of pressure
Answer: By action of ultraviolet rays on oxygen molecule
(24)
On heating ‘ozon’ its volume:
[A]
Increase to 1 ½ times
[B]
Decrease to half
[C]
Remains unchanged
[D]
Becomes double
Answer: Increase to 1 ½ times
(25)
All the elements of the oxygen families are
[A]
Non-metals
[B]
Metalloids
[C]
Radioactive
[D]
Polymorphic
(26)
Oxygen gas can be prepared from solid KMnO4 by:
[A]
Dissolving the solid in dil. HCl
[B]
Dissolving the solid in conc. H2SO4
[C]
Treating the solid with H2 gases
[D]
Strongly heating the solid
Answer: Dissolving the solid in conc. H2SO4
(27)
Starch paper moistened with KI solution turns blue in ozon because of:
[A]
Iodine liberation
[B]
Oxygen liberation
[C]
Alkali formation
[D]
Ozone reacts with litmus paper
Answer: Oxygen liberation
(28)
Formation of ozonide is:
[A]
Addition reaction
[B]
Substitution reaction
[C]
Decomposition
[D]
None of these
Answer: Addition reaction
(29)
Liquid oxygen:
[A]
Is an important constituent of rocket fuels
[B]
Is sued for artificial respiration with CO2
[C]
Mixed with finely divide carbon is explosive
[D]
All of these
(30)
Ozone turns tetramethyl base paper:
[A]
Green
[B]
Violet
[C]
Red
[D]
Black
31
It is possible to obtain oxygen from air by fractional distillation because:
[A]
Oxygen is in different group of periodic table from nitrogen
[B]
Oxygen is more active than nitrogen
[C]
Oxygen has higher boiling point than nitrogen
[D]
Oxygen has lower density than nitrogen
Answer: Oxygen has lower density than nitrogen
32
Ozone molecule is:
[A]
Linear
[B]
Triangular
[C]
Tetrahedral
[D]
None of these
33
White phosphorus reacts with caustic soda. The products are PH3 and NaH2PO2. This reaction is an example of :
[A]
Oxidation
[B]
Reduction
[C]
Neutralization
[D]
Oxidation and reduction
Answer: Oxidation and reduction
34
One mole of calcium phosphide on reaction with excess of water gives:
[A]
One mole of phosphine
[B]
Two mole of phosphoric acid
[C]
Two mole of phosphorus pentaoxide
[D]
Two mole of phosphine
Answer: Two mole of phosphine
35
IN white phosphorus (P4) molecule which one is not correct ?
[A]
Six P – P single bond are present
[B]
Four P – P single bond are present
[C]
Four lone pair of electron are present
[D]
P – P – P bond angle is 60
Answer: Four P – P single bond are present
36
Which statement is not correct?
[A]
White and red phosphorus reach with chlorine at room temperature
[B]
White phosphorus is metastable, while red phosphorus is stable
[C]
White phosphorus is lighter than red phosphorus
[D]
White phosphorus is highly poisonous while red phosphorus is not
Answer: White and red phosphorus reach with chlorine at room temperature
37
Hydrolysis of Pl3 yields:
[A]
Monobasic acid and a salt
[B]
Monobasic acid and dibasic acid
[C]
Dibasic acid and tri basic acid
[D]
Monobasic acid and tribasic acid
Answer: Monobasic acid and dibasic acid
38
When phoshine is bubble through solution of silver nitrate
[A]
Silver
[B]
Silver phosphide
[C]
Silver oxide
[D]
None
39
Which possesses lest stable covalent P – H bond?
[A]
PH3
[B]
P2H6
[C]
P2H5
[D]
PH6+
40
When a lead storage battery is discharge :
[A]
SO2 is evolved
[B]
Lead sulphate is consumed
[C]
Lead is formed
[D]
H2SO4
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