WorksheetsAcid Base and Salt for class 8
Total questions: 30
Worksheet time: 23mins
Acid is a substance which gives .........................when it is dissolved in water.
hydroxide ion
hydroxyl ion
hydrogen ion or proton (H+)
all
Blue litmus paper turns into ................ in acidic solution.
blue
red
no change
pink
.................... turns into pink colour in alkaline solution.
methyl orange
red litmus paper
blue litmus paper
phenolphthalein
Write the name of the acid with molecular formula H2SO4
(a)
How many types of acids are there?
1
2
3
4
write the name of the acid present in curd.
(a)
What is the pH value of pure water?
6
7
0
1
pH scale ranges from ................
1-14
1-7
2-14
0-15
Which of the following statements is correct?
acids have pH more than 7
neutral substances have pH 7
alkalis have pH less than 7
all acids have sour taste
Name the salt used for reducing constipation.
(a)
Write scientific name of washing soda.
(a)
calcium oxide is used to manufacture ...............
washing soda
cement
quick lime
bleaching powder
Which of the following is an organic acid?
nitric acid
sulphuric acid
citric acid
none
Which of the following is an inorganic acid?
citric acid
lactic acid
acetic acid
sulphuric acid
The acids obtained from living beings and have hydrobarbon are called (a) acids
What happens when methyl orange is added in a salt solution?
It does not change its colour
it turns into red colour
it turns into yellow colour
it turns into purple colour
The chemical compounds used to identify whether a given substance is acidic or basic in nature are called (a)
Name the salt with molecular formula K2SO4
(a)
What gives OH- ions when dissolved in water?
acid
base
salt
water
(a) possess a bitter taste and soapy feeling when touched.
Which of the following is not correct?
mineral acids are used in laboratories as reagents.
carbonic acid is used to make soda water and soft drinks.
acetic acid is used in the treatment of scurvy.
nitric acid is used to manufacture chemical fertilizers.
(a) indicators are obtained from parts of plants like petals of flowers and lichens.
(a) indicators are used to find the strength of acidity of basicity of the given acid or basee.
water soluble metallic oxides and hydroxides are called ...........
bases
alkalis
indicator
neutral substances
A base or alkali reacts with an acid to form a (a) and water.
Bases turn red litmus paper into ..............
red
blue
yellow
pink
Complete the given reaction.
HCl + NaOH reacts to give (a) + H2O
Look at the given pH chart. Which of the statements is correct?
acid having more pH value is more acidic.
alkali having more pH value is more alkaline.
neutral substances have less pH value than acids
alkalis have less pH values than acids
Which pair is correct?
copper sulphate- reducing constipation
sodium bicarbonate- preserving food
gypsum- plaster of paris
ammonium sulphate - eletroplating
Which pair is incorrect?
aluminium hydroxide - antacids
caustic potash - potassium hydroxide
mineral acids- laboratory reagents
bases or alkalis - sour taste
