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Chemistry - 9 Chapter - 9
Acids, Bases and Salts
Test - 8
1.
Formic acid is present in?
a) stings of insects like honey bee
b) grapes and tamarind
c) sour milk
d) lemon
2.
Name few Acidic and basic things in common use: Short..Answer������Remember.by.Heart�����
a) Fruit juices, ammonia(NH3), Pickles, Lime (CaO), Vinegar, Lye (NaOH), Tamarind, Magnesia (MgO)
b) Only Fruits
3.
How is strength of acid or base expressed?
a) The strength of acids or bases can be compared with the help of their ionization constants.
b) The strength of acids or bases can be compared with the help of their solutions.
4.
Compare basicity and acidity? Short..Answer������Remember.by.Heart�����
a) The basicity of an acid can be defined as the number of ionisable hydrogen atoms present in its molecule. The acidity of a base means the number of ionisable hydroxyl groups present in its solutin.
b) The basicity of an acid can be defined as the number of ionisable hydrogen atoms present in its molecule. The acidity of a base means the number of ionisable hydroxyl groups present in its molecule
5.
The concentration of hydrogen ions (H+) is given by pH. How will represent the concentration of hydroxide ions?
a) The concentration of hydroxide (OH-) ions in represented pOH. pOH = -log [OH].
b) he concentration of hydroxide (OH-) ions in represented pOH. pOH = log [OH].
6.
Define weak acid and weak base?
a) Weak base: Acids which do not ionize completely in solution are called weak acid. For example CH3COOH, H2CO3. Weak base: Bases which do not ionize completely in solution are called weak acid. For example NH
4
OH.
b) Weak acid: Acids which do not ionize completely in solution are called weak acid. For example CH3COOH, H2CO3. Weak base: Bases which do not ionize completely in solution are called weak bases. For example NH
4
OH.
7.
How will you identify the acidic, basic or neutral nature of a salt solution?
a) Acidic, Basic and neutral nature of the salt solution is indicated by density of the solution
b) Acidic, Basic and neutral nature of the salt solution is indicated by pH of the solution
8.
Write down the name of three strong acids and three strong bases? Short..Answer������Remember.by.Heart�����
Strong acid: Sulphuric acid, H
2
SO
2
, Hydrochloric acid, HCL, Nitric acid, HNO
4
,.......... Strong base: Sodium hydroxide, NaOH, Potassium hydroxide, KOH, Calcium hydroxide CA[OH]
2
a) Strong acid: Sulphuric acid, H
2
SO
4
, Hydrochloric acid, HCL, Nitric acid, HNO
3
,.......... Strong base: Sodium hydroxide, NaOH, Potassium hydroxide, KOH, Calcium hydroxide CA[OH]
2
b) Strong acid: Sulphuric acid, H
2
SO
2
, Hydrochloric acid, HCL, Nitric acid, HNO4,.......... Strong base: Sodium hydroxide, NaOH, Potassium hydroxide, KOH, Calcium hydroxide CA[OH]
2
9.
Which salt of sodium is used in baking powder? Short..Answer������Remember.by.Heart�����
Sodium hydrogen carbonate is used as washing soda.
a) Sodium hydrogen carbonate is used as banking soda.
b) Sodium hydrogen carbonate is used as washing soda.
10.
The concentration of a solution is generally expressed in terms of its.
a) Acidity
b) Molarity
c) Alkalinity
d) Titration
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