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Ayesha Jahan
Subject: Chemistry
, asked on 7/4/18
A certain compound X when treated with copper sulfate solution Yields brown precipitate on adding hypo solution the precipitate turns White. The compound X is
Answer
1
Ridhit Jain
Subject: Chemistry
, asked on 14/3/18
Lithium is electropositive or electeonegative. I am asking this on net it is written electropositive but in the attached link it is written electronegative.
Q. Abnormal behaviour of lithium :
This is due to :
(i) small size
(ii) High electronegativity
(iii) Absence of d-orbitals.
Answer
1
Devayani Pandey
Subject: Chemistry
, asked on 7/3/18
Q. Complete the following reactions :
i
.
O
2
2
-
+
H
2
O
→
i
i
.
O
2
-
+
H
2
O
→
Answer
1
Erw Trjerth
Subject: Chemistry
, asked on 18/2/18
Write all the exceptions in the chapter 's-block elements' and explain each in detail. EXPERT PLEASE ANSWER
Answer
2
Arpita Dua
Subject: Chemistry
, asked on 16/2/18
Solve this:
Answer
2
Arpita Dua
Subject: Chemistry
, asked on 16/2/18
Solve this:
Answer
1
Ruba Balu
Subject: Chemistry
, asked on 31/1/18
22nd
Q22. How can CaCO
3
be prepared in the lab ?
Ca(OH)
2
+ CO
2
→
CaCl
2
+ Na
2
CO
3
→
Answer
1
Ruba Balu
Subject: Chemistry
, asked on 31/1/18
10th
Q10. Complete the following equations :
a) CaCO
3
– heat
→
d) CaO + SiO
2
→
b) CaCl
2
+ Na
2
CO
3
→
e) 6CaO + P
4
O
16
→
c) CaCO
3
+ HNO
3
→
Answer
2
Ruba Balu
Subject: Chemistry
, asked on 31/1/18
9
.
D
r
a
w
t
h
e
s
t
r
u
c
t
u
r
e
o
f
B
e
C
l
2
i
n
s
o
l
i
d
s
t
a
t
e
.
D
r
a
w
t
h
e
s
t
r
u
c
t
u
r
e
o
f
B
e
C
l
2
i
n
v
a
p
o
u
r
s
t
a
t
e
D
r
a
w
t
h
e
s
t
r
u
c
t
u
r
e
o
f
B
e
C
l
2
Answer
2
Ruba Balu
Subject: Chemistry
, asked on 31/1/18
8
.
B
e
O
H
2
i
s
a
m
p
h
o
t
e
r
i
c
i
n
n
a
t
u
r
e
.
I
l
l
u
s
t
r
a
t
e
.
B
e
O
H
2
+
2
O
H
→
B
e
O
H
2
+
2
H
C
l
+
2
H
2
O
→
Answer
2
Ruba Balu
Subject: Chemistry
, asked on 31/1/18
4th
Q4. Complete the following :
Be + O
2
→
Be + N
2
→
Mg + 2HCl
→
BeO + C + Cl
2
– 600–800 K
→
BeCl
2
+ LiAlH
4
→
Mg + (x + y ) NH
3
→
Answer
4
Ruba Balu
Subject: Chemistry
, asked on 31/1/18
14th
14. Complete the following equations :
a
)
N
a
2
O
+
H
2
O
→
c
)
2
K
O
2
+
H
2
O
→
b
)
N
a
2
O
+
2
H
2
O
→
d
)
2
N
a
N
O
3
→
Answer
1
Hermoine
Subject: Chemistry
, asked on 30/1/18
explain the solubility trends across the period and along the group what is the scenario in case of sulphates and carbonates, thank you
Answer
1
Ruba Balu
Subject: Chemistry
, asked on 29/1/18
Q. Complete the following equations :
(a) Na
2
O + H
2
O
→
(c) 2KO
2
+ H
2
O
→
(b) Na
2
O
2
+ 2H
2
O
→
(d) 2Na NO
3
→
Answer
1
Ruba Balu
Subject: Chemistry
, asked on 29/1/18
Solve this:
Complete the following reactions.
d
)
2
Na
+
H
2
O
→
e
)
2
Li
+
H
2
→
f
)
2
Na
+
Cl
2
→
Answer
2
1
2
3
4
5
Next
What are you looking for?
Q. Abnormal behaviour of lithium :
This is due to :
(i) small size
(ii) High electronegativity
(iii) Absence of d-orbitals.
Q. Complete the following reactions :
Q22. How can CaCO3 be prepared in the lab ?
Ca(OH)2 + CO2
CaCl2 + Na2CO3
Q10. Complete the following equations :
a) CaCO3 – heat d) CaO + SiO2
b) CaCl2 + Na2CO3 e) 6CaO + P4O16
c) CaCO3 + HNO3
Q4. Complete the following :
Be + O2
Be + N2
Mg + 2HCl
BeO + C + Cl2 – 600–800 K
BeCl2 + LiAlH4
Mg + (x + y ) NH3
14. Complete the following equations :
(a) Na2 O + H2O (c) 2KO2 + H2O
(b) Na2O2 + 2H2O (d) 2Na NO3