Std 9 science chapter 5 acids bases and salts question answer |class 9 science ch 5 question answer
0Hi friends this is educational help channel.
Your queries :-
Std 9 science chapter 5 acids bases and salts question answer
class 9 science ch 5 question answer
9th class science Chapter 5 question answer
9th standard science chapter 5 question answer
Class 9th science chapter 5 question answer
9th std science Chapter 5 question answer
9th Exercise science chapter 5
Acids bases and salts question answer
1. Identify the odd one out and justify.
(a) Chloride, nitrate, hydride,
ammonium
(b) Hydrogen
chloride,
sodium
hydroxide, calcium oxide, ammonia
(c) Acetic acid, carbonic
acid,
hydrochloric acid, nitric acid
(d) Ammonium chloride, sodium
chloride, potassium nitrate, sodium
sulphate
(e) Sodium nitrate, sodium carbonate,
sodium sulphate, sodium chloride
(f) Calcium oxide, magnesium oxide,
zinc oxide, sodium oxide.
(g) Crystalline blue vitriol, crystalline
common salt, crystalline ferrous
sulphate, crystalline sodium
carbonate.
(h) Sodium
chloride, potassium
hydroxide, acetic acid, sodium
acetate.
2. Write down the changes that will be
seen in each instance and explain the
reason behind it.
(a) 50ml water is added to 50ml
solution of copper sulphate.
(b) Two drops of the indicator
phenlphthalein were added to 10ml
sodium and chlorine.
b. Formation of a magnesium chloride
from magnesium and chlorine.
5. Show the dissociation of the following
compounds on dissolving in water,
with the help of chemical equation
and write whether the proportion of
dissociation is small or large.
Hydrochloric acid, Sodium chloride,
Potassium hydroxide, Ammonia,
Acetic acid, Magnesium chloride,
Copper sulphate.
6. Write down the concentration of
each of the following solutions in g/L
and mol/L.
a. 7.3g HCl in 100ml solution
b. 2g NaOH in 50ml solution
2- CU COOL: 100mLolution
73
3.
4.
solution of sodium hydroxide.
(c) Two or three filings of copper were
added to 10ml dilute nitric acid and
stirred.
(d) A litmus paper was dropped into
2ml dilute HCI. Then 2ml
concentrated NaOH was added to it
and stirred.
(e) Magnesium oxide was added to
dilute HCl and magnesium oxide
was a added to dilute NaOH.
(f) Zinc oxide was added to dilute HCI
and zinc oxide was added to dilute
NaOH.
(g) Dilute HCI was added to limestone.
(h) Pieces of blue vitriol were heated in
a test tube. On cooling, water was
added to it.
(i) Dilute H₂SO, was taken in an
electrolytic cell and electric current
was passed through it.
Classify the following oxides into
three types and name the types.
CaO, MgO, CO₂, SO3, Na₂0, ZnO,
Al₂O3, Fe₂O,
Explain by drawing a figure of the
electronic configuration.
a. Formation of sodium chloride from
10. Write the chemical equations for the
following activities.
(a) NaOH solution was added to HCI
solution.
(b) Zinc dust was added to dilute
H₂SO.
(c) Dilute nitric acid was added to
calcium oxide.
(e) Carbon dioxide gas was passed
through KOH solution.
(f) Dilute HCI was poured on baking
soda.
11. State the differences.
a. Acids and bases
b. Cation and anion
c. Negative electrode and positive
electrode.
In
6. Write down the concentration of
each of the following solutions in g/L
and mol/L.
a. 7.3g HCl in 100ml solution
b. 2g NaOH in 50ml solution
c. 3g CH₂COOH in 100ml solution
d. 4.9g H,SO, in 200ml solution
7. Obtain a sample of rainwater. Add to
it a few drops of universal indicator.
Meausre its pH. Describe the nature
of the sample of rainwater and
explain the effect if it has on the
living world.
8. Answer the following questions.
a. Classify the acids according to
their basicity and give one example
of each type.
b. What is meant by neutralization?
Give two examples from everyday
life of the neutralization reaction.
c. Explain what is meant by
electrolysis of water. Write the
electrode reactions and explain
them.
9. Give reason for the following.
a. Hydronium ions are always in the
form H,O+
b. Buttermilk spoils if kept in a copper
or brass container.
74
11. State the differences.
a. Acids and bases
b. Cation and anion
c. Negative electrode and positive
electrode.
12. Classify aqueous solutions of the
following substances according to
their pH into three groups: 7, more
than 7, less than 7.
Common salt, sodium acetate,
hydrochloric acid, carbon dioxide,
potassium bromide, calcium hydoxide,
ammonium chloride, vinegar, sodium
carbonate, ammonia, sulphur dioxide.
Project:
Collect information about
electroplating. Make a list of
articles in day-to-day life, where
this technique is used.
#trending
#maharashtraboard
#szedututorial
#question_answer
#all_subject_answer