Acid Base & Salt - WBCS Online Portal for Self Studies

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Acid, Base & Salt

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Baking powder is
(a) a mixture (b) a compound
(c) an element (d) a salt

A mixture

Acids and bases are important because of
(a) their use in industry
(b) their effects on human health
(c) their effect on farmer’s crop
(d) all the above are correct.

All the above

Select the one that is having pH < 7.
(a) lime juice (b) lime water
(c) human blood (d) antacid

) lime juice (b) lime water 2toi to acidic

(a) Lime juice hbe… lime water ph 12.4 er ase pase.. kichu reference pele diye dio

Sharp flavour of Coca Cola or any other soft drink is because of the presence of-
Hydrochloric acid / oxalic acid / phosphoric acid /none

None

none

Phosphoric acid

ok

Sour Milk or curd or dahi is produced in the presence of-
Maleic acid / oxalic acid / lactic acid / acetic acid

lactic acid

Consider the following-bases turn Litmus to blue / methyl orange to yellow/ have a bitter taste /all of the above

all of the above are true

Non metallic oxides are acidic in nature-
True / false

True

Which of the following is not required to find the pH of a
given sample ?
(a) pH paper (b) Litmus paper
(c) Universal indicator (d) Standard pH chart

Litmus paper?

yes

Aqua regia is the solution of- HNO3+conc.HCL/NH3+conc.HCL/HCL+conc.HNO3/none

HNO3+conc.HCL

HCL+conc.HNO3

Con.HNO3+con.HCL

Which of the following is an alkali ?
(a) Ca(OH)2 (b) KOH
(c) Mg(OH)2 (d) CaCO3

Caco3

Bakigulo keno hobe Na….

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