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NEET Chemistry MCQ
Nitrogen Family Mcq Neet Chemistry
Quiz 6
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Q.1
One mole of phosphide on rating with with excess of water gives.. [ IIT 1999]
0%
a) One mole of phosphine
0%
b) Two moles of phosphoric acid
0%
c) Two moles of phosphine
0%
d) One mole of phosphorus oxide
Explanation
Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3 ( phosphine) Answer: (c)
Q.2
PH3 n the hydride of phosphate is ..
0%
a) Metallic
0%
b) Ionic
0%
c) Non metallic
0%
d) Covalent
Explanation
Answer: (d)
Q.3
Which shows maximum valency? [ CPMT 2003]
0%
a) Phosphorus
0%
b) Tin
0%
c) Antimony
0%
d) Bismuth
Explanation
P have maximum valency of 5 Answer:(a)
Q.4
Among the trihalides of nitrogen which one is most basic? [ Pb CET 1997]
0%
a) NF3
0%
b) NCl3
0%
c) NI3
0%
d) NBr3
Explanation
Down the group electronegativity decreases hence acidic character decreases Answer: (c)
Q.5
the basicity of phosphorous acid is .. [ Kerala MEE 2001]
0%
a) 1
0%
b) 2
0%
c) 3
0%
d) 4
Explanation
Structure of phosphorous acid have two Hydrogens are attached to Oxygen atom and the third Hydrogen is attached directly to the Phosphorous. Hydrogens attached to the oxygen are the acidic Hydrogens but the Third Hydrogen is not the acidic Hydrogen. It wouldn't be lost in a reactions and it will not be counted in the basicity or acidic strength. Answer: (b)
Q.6
Sodium hexametaphosphate is known as .. [ EAMCET 2001]
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a) Calgon
0%
b) Permutit
0%
c) Natalite
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d) Nitrolim
Explanation
Answer: (a)
Q.7
The correct sequence of decrease in the bond angle of the following hydrides .. [ MP PET 2002]
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a) NH3 > PH3 >AsH3 > SbH3
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b) NH3 > AsH3 > PH3 >SbH3
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c) SbH3 > AsH3 > PH3 > NH3
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d) PH3 > NH3 >AsH3 >SbH3
Explanation
Electronegativity of central atom decreases in group, thus bond angle decreases electronegativity N > P > A > Sb Answer:(a)
Q.8
PCl on hydrolysis gives [ DPMT 1996]
0%
a) HPO3
0%
b) POCl3
0%
c) H3PO3
0%
d) H3PO4
Explanation
PCl3 + 3H2O → H3PO3 +3 HCl Answer: (c)
0 h : 0 m : 1 s
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