question_answer1)
What is
the pH of gastric juice, which is released during digestion?
question_answer2)
Why sodium
carbonate 
is a basic salt?
question_answer3)
Which gas
is evolved when sodium hydrogen carbonate 
is
added to acetic acid?
question_answer8)
What is
the correct method of finding the pH of a solution?
question_answer10)
Out of 
and 
,
which solution has higher value of pH?
question_answer17)
Name any
salt which does not contain water of crystallisation?
question_answer18)
Which gas
would be evolved, if sodium bicarbonate is treated with tartaric acid?
question_answer20)
What would
be the colour of litmus in a solution of sodium carbonate?
question_answer21)
Name a
carbonate of a metal which has cleansing properties.
question_answer24)
Which
bases are called alkalies? Give an example of alkali.
question_answer29)
What
happens when nitric acid is added to egg shell?
question_answer31)
Which one
of these has a higher concentration of 
ions
: 1M HCl or 1M?
question_answer32)
Why does
1M HCl solution have a higher concentration of ions
than 1M solution?
question_answer34)
How does
acetic acid help in the preservation of food?
question_answer39)
Name the
gas evolved when dilute sulphuric acid acts on sodium carbonate.
question_answer42)
How does a
strong acid differ from a concentrated acid?
question_answer45)
How would you distinguish between baking powder and
washing soda by heating?
question_answer46)
Write two observations you make when quicklime is added to
water.
question_answer53)
Give the chemical names of acid present in
(a) Ants (b) Lemon
(c) Milk (d)
Tomato
question_answer55)
What are antacids? Name one compound that can be used as
an antacid.
question_answer57)
Why is tartaric acid added into baking soda to get baking
powder?
question_answer58)
Choose strong/weak acid and strong/weak bases from the
following compounds
question_answer60)
Name the salts of sulphuric acid.
question_answer61)
(a) Name a strong base and a weak base.
(b) Name a hydrated salt.
question_answer65)
What is acid rain? What is its pH?
question_answer66)
Name any four chemicals for which common salt is used as
raw material.
question_answer72)
A tarnished copper vessel begins to shine again when
rubbed with lemon. Why?
question_answer84)
Why does tooth decay start when the pH of mouth is lower
than 5.5?
question_answer85)
What is baking powder? How does it make the cake soft and
spongy?
question_answer92)
What pH do you expect for the following salts solutions
and why? 
question_answer97)
How do metal carbonates and metal hydrogen carbonates
react with acids ?
question_answer103)
Name
the acid present in vinegar.
question_answer104)
Name
two salts that are used in black and white photography.
question_answer112)
Why does dry HC1 gas not change the colour of
the dry litmus paper? [NCERT]
question_answer113)
Explain why an aqueous solution of ammonium
chloride is acidic in nature.
question_answer120)
Why does an aqueous solution of an acid conduct
electricity? [NCERT]
question_answer123)
What is the commercial name of calcium sulphate
hemihydrate?
question_answer124)
Name the substance obtained by the action of
chlorine on dry slaked lime.
question_answer125)
Which is the real bleaching agent present in
bleaching powder?
question_answer131)
What is an olfactory indicator? Name two such
indicators.
question_answer141)
Why do acids not show acidic behaviour in the
absence of water? [NCERT]
question_answer157)
What
happens when nitric acid is added to an eggshell? [NCERT Exemplar]
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What would you suggest, the bulb will glow in this case or
not?
In which set up, no gas is evolved?
What would be the correct observation given by the
student?
(a)
In place of zinc granules, same amount of zinc dust is taken in the test tube.
(b)Instead
of dilute sulphuric acid, dilute hydrochloric acid is taken.
(c)Sodium hydroxide is taken in place of dilute
sulphuric acid and the tube is heated.
(ii) How do metal carbonates and metal hydrogen
carbonates react with acids? [NCERT
Exemplar]
