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1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
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Which of the following statements is not valid for oxoacids of phosphorus?
A
Orthophosphoric acid is used in the manufacture of triple superphosphate.
B
Hypophosphorous acid is a diprotic acid.
C
All oxoacids contain tetrahedral four coordinated phosphorus.
D
All oxoacids contain atleast one P$$=$$O unit and one P$$-$$OH group.
2
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Which of the following oxide is amphoteric?
A
SnO2
B
CaO
C
SiO2
D
CO2
3
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Which of the following statements is incorrect?
A
Pure sodium metal dissolves in liquid ammonia to give blue solution.
B
NaOH reacts with glass to give sodium silicate.
C
Aluminium reacts with excess NaOH to give Al(OH)3.
D
NaHCO3 on heating gives Na2CO3.
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By doing so it
A
decomposes Na2S and NaCN, formed
B
helps in the precipitation of AgCl
C
increases the solubility product of AgCl
D
increases the concentration of N$$_3^ - $$ ions
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