1
KCET 2018
MCQ (Single Correct Answer)
+1
-0
Which of the following is an amphoteric oxide?
A
$\mathrm{V}_2 \mathrm{O}_5, \mathrm{Cr}_2 \mathrm{O}_3$
B
$\mathrm{Mn}_2 \mathrm{O}_7, \mathrm{Cr}_2 \mathrm{O}_3$
C
$\mathrm{CrO}, \mathrm{V}_2 \mathrm{O}_5$
D
$\mathrm{V}_2 \mathrm{O}_5, \mathrm{~V}_2 \mathrm{O}_4$
2
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The electronic configuration of transition element " $X$ ", $[\mathrm{Ar}] 3 d^5$ is oxidation state is +3 . What is its atomic number?
A
25
B
26
C
27
D
24
3
KCET 2017
MCQ (Single Correct Answer)
+1
-0
The electronegativities of $\mathrm{C}, \mathrm{N}, \mathrm{Si}$ and P are in the order of
A
$\mathrm{P}<\mathrm{Si}<\mathrm{C}<\mathrm{N}$
B
Si $<$ P $<$ C $<$ N
C
$\mathrm{P}<\mathrm{Si}<\mathrm{N}<\mathrm{C}$
D
Si $<$ P $<$ N $<$ C
4
KCET 2017
MCQ (Single Correct Answer)
+1
-0
Which one of the following noble gas has an unusual property of diffusing through the materials such as rubber, glass or plastic?
A
Kr
B
Ne
C
Ar
D
He
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