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Recent questions in p-Block Elements
Questions
>>
CBSE XII
>>
Chemistry
>>
p-Block Elements
Aluminium (III) chloride forms a dimer because aluminium
cbse
class12
chemistry
ch-7
p-block-elements
asked
Feb 7, 2017
by
meena.p
1
answer
The Species that does not contain peroxide ions is
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
There is no S-S bond in
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
Bond energy is highest for
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
Amongst
H
2
O
,
H
2
S
,
H
2
S
e
and
H
2
T
e
the one with highest boiling point is
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
Which among the following is peroxic acid of sulphur ?
(
i
)
H
2
S
O
3
(
i
i
)
H
2
S
O
4
(
i
i
i
)
H
2
S
2
O
8
(
i
v
)
H
2
s
O
4
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
0
answers
The true statement for the acids of phosphorus ,
H
3
P
O
2
,
H
3
P
O
3
and
H
3
P
O
4
is
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
The number of S-S bonds is cyclic trimer of sulphur trioxide
(
S
3
O
3
)
is
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
The correct order of acidic strength is
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
The number of P_O_P linkages in pyrophosphopric acid is
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
Which one of the following oxides is neutral
cbse
class12
chemistry
ch-7
p-block-elements
asked
Nov 30, 2016
by
meena.p
1
answer
A boy baths in the first shower of rainfall during rainy season and his body gets yellowish brown colour patches on the whole body for which he was medicated. Answer the following questions: (i) Why the skin of the boy got yellowish brown patches. (ii) As a student of chemistry what do you think could be reason and the term you would use to explain it? (iii) Which values are promoted through this activity? (iv) Suggest two activities to promote these values.
cbse
class12
chemistry
sec-d
ch-7
p-block-elements
value-based-question
asked
Nov 28, 2016
by
meena.p
1
answer
(i) Are all the five bonds in
P
C
l
5
molecules equivalent ? justify your answer. (ii) What happens when
P
C
l
5
is heated ?
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Nov 25, 2016
by
meena.p
1
answer
Which of the following does not react with oxygen directly ? why ?
Z
n
,
T
i
,
P
t
,
F
e
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Nov 24, 2016
by
meena.p
1
answer
Why the bond angles is in the following order ?
N
H
3
=
106.5
∘
,
P
H
3
=
93.5
∘
,
,
A
S
H
3
=
91.5
∘
,
,
S
b
H
3
=
91.3
∘
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Nov 23, 2016
by
meena.p
1
answer
Why ICl bonds are weaker than
C
l
2
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Nov 23, 2016
by
meena.p
1
answer
Complete the following chemical equations : (i)
P
4
+
S
O
2
C
l
2
→
(
i
i
)
F
e
3
+
+
S
O
2
+
H
2
O
→
(
i
i
i
)
X
e
F
6
+
H
2
O
→
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Nov 22, 2016
by
meena.p
1
answer
Give reasons for the following : (i) Nitric oxide become brown when released in air . (ii) Ammonia acts as a ligand.
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Nov 21, 2016
by
meena.p
1
answer
Why
B
H
−
4
and
N
H
+
4
are isolobal.
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Nov 17, 2016
by
meena.p
1
answer
In the preparation of
H
2
S
O
4
by contact process , why is
S
O
3
hot absorbed directly in water to form
H
2
S
O
4
?
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Nov 17, 2016
by
meena.p
1
answer
Draw the structure of the following
a
)
H
2
S
2
O
8
b
)
X
e
O
3
c
)
H
O
C
l
O
2
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Nov 15, 2016
by
meena.p
1
answer
Complete the following reactions : (i)
P
4
+
8
S
O
C
l
2
→
(
i
i
)
I
−
+
O
3
+
H
2
O
→
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Nov 15, 2016
by
meena.p
2
answers
What happens when (i) Chorine gas is passed through a hot concentrated solution of
N
a
O
H
? (ii) Sulphur dioxide gas is passed gas is passed through an aqueous solution of
F
e
(
I
I
I
)
salt ?
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Nov 14, 2016
by
meena.p
1
answer
Explain giving a suitable reason for each of the following : a)Transition metal and their compounds are generally found to be good catalysts. b) Transition metal and their compounds generally exhibit a para-magnetic behaviour .
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Nov 11, 2016
by
meena.p
1
answer
Explain why inspite of nearly the same electronegativity , oxygen forms hydrogen bonding while chloride does not
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Nov 11, 2016
by
meena.p
1
answer
p- Dichlorobenzene has higher melting point and lower solubility than o- and m- isomers Discuss.
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Nov 7, 2016
by
meena.p
1
answer
Explain giving a reason for each of the following situation : (i) In aqueous medium, HCl is stronger acid than HF (ii) White phosphorus is more reactive than red phosphorous.
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Nov 4, 2016
by
meena.p
1
answer
When Cons
H
2
S
O
4
was added into an unknown salt present in a test tube, a brown gas (A) was evolved . This gas intensified when copper turnings were also added into this test tube . On cooling , the gas (A) changed into a colourless gas (B) (a) identify the gases A and B.
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Nov 3, 2016
by
meena.p
1
answer
Calculate the number of unpaired electrons in the following gaseous ions :
(
i
)
M
n
3
+
(
i
i
)
C
r
3
+
(
i
i
i
)
V
3
+
(
i
v
)
T
i
3
+
Which one of these is most stable in aqueous solutions ?
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Nov 1, 2016
by
meena.p
1
answer
How many Isomers are there for octahedral complex
[
C
O
C
l
2
(
e
n
)
(
N
H
3
)
2
]
+
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Oct 31, 2016
by
meena.p
1
answer
What is meant by disproportionation of an oxidation state ? Give an example
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Oct 27, 2016
by
meena.p
1
answer
Give the reasons for the following : (a)
C
N
−
ions is known but
C
P
−
ion is not known (b)
N
O
2
dimerizes to form
N
2
O
4
(c)
I
C
I
is more reactive that
I
2
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Oct 27, 2016
by
meena.p
1
answer
Predict which of the following will be colourless in aqueous solution ?
T
i
3
+
,
V
3
+
,
S
c
3
+
,
M
n
2
+
,
F
e
3
+
,
C
o
2
+
and
M
n
O
−
4
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Oct 26, 2016
by
meena.p
1
answer
Draw the structure of
B
r
F
3
molecule
cbse
class12
chemistry
sec-c
ch-9
p-block-elements
asked
Oct 24, 2016
by
meena.p
1
answer
Out of
H
2
O
and
H
2
S
which one has higher, bond angle ?
cbse
class12
chemistry
sec-b
ch-9
p
-
block
p-block-elements
asked
Oct 21, 2016
by
meena.p
1
answer
(a) Give one reaction of D- glucose which cannot be explained by its open chain structure . (b)Give one example each for essential and non essential amino acids (c) Differentiate between keratin and insulin .
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Oct 20, 2016
by
meena.p
1
answer
Complete the following reactions:
(
i
)
X
e
F
6
+
H
2
O
→
_______+ _________
(
i
i
)
X
e
F
6
+
H
2
O
→
_______ + _________
(
i
i
i
)
C
l
2
+
H
2
O
→
_______ + _________
cbse
class12
chemistry
ch-7
sec-c
p-block-elements
asked
Oct 13, 2016
by
meena.p
1
answer
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