NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Talib Kausar Faridy
Subject: Science
, asked on 26/4/18
What is salt solution
Answer
2
Neha
Subject: Science
, asked on 26/4/18
Q. Write balanced equations for the following word equations.
1. Potassium chloride + Silver nitrate
→
potassium nitrate + Silver chloride
2. Alumnium hydroxide + Sodium nitrate
→
Aluminum nitrate + Sodium hydroxide
3. Iron metal + Copper(II) sulphate
→
Iron(ii) sulphate + copper metal 4.
4. Alumnium metal + Copper(II) chloride
→
Aluminum chloride + copper metal
5. Potassium bromide
→
potassium metal + Bromine
6. Calcium carbonate
→
Calcium oxide + Carbon dioxide gas
7. Zinc metal + Oxygen gas
→
Zinc oxide
8. Chlorine gas + Sodium metal
→
Sodium chloride
9. Aluminum sulphate + Barium chloride
→
Aluminum chloride + Barium sulphate
10. Sodium hydrogen carbonate
→
Sodium carbonate + Carbon dioxide + Water
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
24.
A, B and C are three elements which undergo following chemical reactions,
A
2
O
3
+
2
B
→
B
2
O
3
+
2
A
3
C
S
O
4
+
2
B
→
B
2
(
S
O
4
)
3
+
3
C
3
C
O
+
2
A
→
A
2
O
3
+
3
C
Answer the following questions with reasons.
(a) Which element is the most reactive ?
(b) Which element is the least reactive ?
(c) What is the type of reaction listed above ?
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
Q22. Write a balanced chemical equation for each of the following reactions and also classify them.
(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.
(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.
(c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas
(d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.
Q23. What happens when iron nail is put inside copper sulphate solution? Write the reactions with observations.
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
11. Why the solution of silver nitrate becomes blue in colour after some time when copper turnings are added to it ?
12. Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved the identify the type of reaction.
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
8. How can you say that respiration is an exothermic process?
Name two biochemical reaction which are exothermic.
Answer
1
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
3
.
W
r
i
t
e
t
h
e
b
a
l
a
n
c
e
d
c
h
e
m
i
c
a
l
e
q
u
a
t
i
o
n
s
f
o
r
t
h
e
f
o
l
l
o
w
i
n
g
r
e
a
c
t
i
o
n
s
a
n
d
i
d
e
n
t
i
t
y
t
h
e
t
y
p
e
o
f
r
e
a
c
t
i
o
n
i
n
e
a
c
h
c
a
s
e
a
)
N
i
t
r
o
g
e
n
g
a
s
i
s
r
e
a
t
e
d
w
i
t
h
h
y
d
r
o
g
e
n
g
a
s
i
n
t
h
e
p
r
e
s
e
n
c
e
o
f
a
c
a
t
a
l
y
s
t
a
t
773
k
t
o
f
o
r
m
g
a
s
b
)
S
o
d
i
u
m
h
y
d
r
o
g
e
n
s
o
l
u
t
o
n
i
s
t
r
a
t
e
d
w
i
t
h
a
c
e
t
i
c
a
c
i
d
t
o
f
o
r
m
s
o
d
i
u
m
a
c
e
t
a
t
e
a
n
d
w
a
t
e
r
Answer
2
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
Answer
2
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
Q.6. Write the balanced chemical equations for the following reactions.
(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen carbonate
(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.
(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (
C
u
2
I
2
/
C
u
I
), liberates iodine gas and also forms potassium sulphate.
Answer
2
Jayraj
Subject: Science
, asked on 26/4/18
Solve this:
Short answer type questions
Grapes hanging on the plant do not ferment but
after being plucked from the plant Can be
fermented Under what conditions do these grapes
ferment? Is it a chemical or a physical change?
Answer
2
Gurkirat Singh
Subject: Science
, asked on 25/4/18
why corrosion requires acidic medium
Answer
1
Prithika
Subject: Science
, asked on 23/4/18
Does all the reactions in this world take place in either an acidic medium or a basic medium?
Answer
2
Aryan
Subject: Science
, asked on 23/4/18
Mam what is balanced chemical equation
Answer
2
Prev
3
4
5
6
7
Next
What are you looking for?
1. Potassium chloride + Silver nitrate potassium nitrate + Silver chloride
2. Alumnium hydroxide + Sodium nitrate Aluminum nitrate + Sodium hydroxide
3. Iron metal + Copper(II) sulphate Iron(ii) sulphate + copper metal 4.
4. Alumnium metal + Copper(II) chloride Aluminum chloride + copper metal
5. Potassium bromide potassium metal + Bromine
6. Calcium carbonate Calcium oxide + Carbon dioxide gas
7. Zinc metal + Oxygen gas Zinc oxide
8. Chlorine gas + Sodium metal Sodium chloride
9. Aluminum sulphate + Barium chloride Aluminum chloride + Barium sulphate
10. Sodium hydrogen carbonate Sodium carbonate + Carbon dioxide + Water
24. A, B and C are three elements which undergo following chemical reactions,
Answer the following questions with reasons.
(a) Which element is the most reactive ?
(b) Which element is the least reactive ?
(c) What is the type of reaction listed above ?
Q22. Write a balanced chemical equation for each of the following reactions and also classify them.
(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.
(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.
(c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas
(d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.
Q23. What happens when iron nail is put inside copper sulphate solution? Write the reactions with observations.
11. Why the solution of silver nitrate becomes blue in colour after some time when copper turnings are added to it ?
12. Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved the identify the type of reaction.
Name two biochemical reaction which are exothermic.
Q.6. Write the balanced chemical equations for the following reactions.
(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen carbonate
(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.
(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (), liberates iodine gas and also forms potassium sulphate.
Short answer type questions
Grapes hanging on the plant do not ferment but
after being plucked from the plant Can be
fermented Under what conditions do these grapes
ferment? Is it a chemical or a physical change?