P-Block Elements Quiz | P-Block Elements Objective Type Questions and Answers

Questions
21 NH3 gas is dried over:
A Anhydrous CaCl2
B P2O5
C Quick lime
D Conc. H2SO4

Answer: Anhydrous CaCl2
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

Answer: 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

Answer: All of these
30 Ozone turns tetramethyl base paper:
A Green
B Violet
C Red
D Black

Answer: 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

Answer: Triangular
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

Answer: Silver phosphide
39 Which possesses lest stable covalent P – H bond?
A PH3
B P2H6
C P2H5
D PH6+

Answer: PH6+
40 When a lead storage battery is discharge :
A SO2 is evolved
B Lead sulphate is consumed
C Lead is formed
D H2SO4

Answer: H2SO4
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