Olympiad Science - Acids, Bases and Salts
Exam Duration: 45 Mins Total Questions : 30
Which acid is present in vinegar
- (a)
Formic acid
- (b)
Acetic acid
- (c)
Citric acid
- (d)
Malic acid
In which of the following is ascorbic acid present?
- (a)
Tea and coffee
- (b)
Milk
- (c)
Ants
- (d)
Fruits and vegetables
From which of the following is the natural indicator litmus extracted?
- (a)
Mycorrhiza
- (b)
Lichens
- (c)
Mucor
- (d)
Mycelia
What is injected into the skin when an ant bites
- (a)
Acid
- (b)
Base
- (c)
Salt
- (d)
Water
Which of the following chemicals are used to neutralise the basic nature of soil
- (a)
Quick lime
- (b)
Organic matter
- (c)
Slaked lime
- (d)
Baking soda
Which of the following is an antacid
- (a)
Mg(OH)2
- (b)
NaOH
- (c)
H2S04
- (d)
H20
Which of the following statements is correct
- (a)
Acids turn blue litmus red
- (b)
Bases turn red litmus blue
- (c)
Water changes the colour of a litmus.
- (d)
Both (A) and (B)
What change does colourless phenolphthalein undergo in acidic and neutral solutions
- (a)
Remains colourless
- (b)
Turns pink
- (c)
Turns red
- (d)
Turns green
How does colourless phenolphthalein change in the presence of bases?
- (a)
Remains colourless
- (b)
Becomes pink
- (c)
Becomes red
- (d)
Becomes green
A substance 'X' is found in the milk of magnesia. What is 'X'?
- (a)
An acid
- (b)
A base
- (c)
Water
- (d)
A salt
What happens when an acid is slowly added to water?
- (a)
It releases heat
- (b)
It absorbs heat.
- (c)
There is no heat change
- (d)
It undegoes aeutrallsation
Identify the formula of washing soda from the following.
- (a)
NaCl
- (b)
Na2C03
- (c)
NaHC03
- (d)
NaOH
Which acid is used in the making of e When CO2 is passed through lime water, synthetic vinegar?
- (a)
Formic acid
- (b)
Acetic acid
- (c)
Sulphuric acid
- (d)
Nitric acid
What is the effect of the soap solution on phenolphthalein?
- (a)
It turns pink
- (b)
It remains colourless
- (c)
It turns blue
- (d)
It turns red
An indicator prepared from turmeric (Haldi) is added to a strong alkali solution. What colour does the indicator change to?
- (a)
Yellow
- (b)
Brick red
- (c)
Orange
- (d)
Blue
What is the chemical formula of caustic e What is the chemical formula of caustic potash?
- (a)
KOH
- (b)
NH4OH
- (c)
AI(OH)3
- (d)
LiOH
Study the given reaction \(NaOH+HCl\rightarrow NaCl+H_{ 2 }0\) sulphuric acid. What should she do? Identify the salt in the above reaction
- (a)
\(NaCl\)
- (b)
H2O
- (c)
\(HCl\)
- (d)
NaOH
Identify the salt used in cooking
- (a)
NaCl
- (b)
MgCl2
- (c)
CaCl2
- (d)
KCl
When CO2 is passed through lime water, synthetic vinegar? it turns milky. Identify the cause for the
- (a)
Formation of CaC03
- (b)
Formation of Ca(OH)2
- (c)
Formation of H2O
- (d)
Formation of H2
Chemically, which of the following is baking soda?
- (a)
Ca(OH)2
- (b)
NaHC03
- (c)
Na2C03
- (d)
CaO
Which is the weakest acid among the following?
- (a)
Citric acid
- (b)
Sulphuric acid
- (c)
Hydrochloric acid
- (d)
Nitric acid
Which of the following does milk contain
- (a)
Acid
- (b)
Base
- (c)
Salt
- (d)
All of the above
Sunidhi's teacher asked her to prepare dilute sulphuric acid from concentrated sulphuric acid. What should she do?
- (a)
Add water to the acid
- (b)
Add acid to the water
- (c)
Add a base to the concentrated acid
- (d)
Add an alkali to the concentrated acid
What do toothpastes contain?
- (a)
Strong acids
- (b)
Base
- (c)
Acidic oxides
- (d)
Metals
Which of the following statements is NOT true?
- (a)
Antacids are bases
- (b)
A salt is neither acidic nor basic
- (c)
Phenolphthalein is an indicator
- (d)
All bases are alkalis but all alkalis are not bases
A pH scale is given below
Neutral \(\leftarrow Acids\rightarrow \uparrow \leftarrow Base\rightarrow \)
P Q R S |
Which of the following mixtures can produce a neutral solution
- (a)
P and Q
- (b)
P and R
- (c)
Rand S
- (d)
All of these
In an accident at a factory, some nitric acid was spilled. Which substance, when added in excess would neutralise the acid without leaving an alkaline solution?
- (a)
Aqueous ammonia
- (b)
Aqueous sodium hydroxide
- (c)
Calcium carbonate
- (d)
Water
What do antacids contain
- (a)
A weak acid
- (b)
A weak base
- (c)
A strong acid
- (d)
A strong base
Which of the following substances react with each other to form salt and water only?
- (a)
Dilute sodium hydroxide and dilute hydrochloric acid
- (b)
Magnesium and dilute hydrochloric acid
- (c)
Copper sulphate and dilute sulphuric acid
- (d)
Washing soda solution in water and dilute nitric acid
Identify the only base which does not have a metal in its molecule
- (a)
NaOH (Sodium hydroxide
- (b)
NH4OH (Ammonium hydroxide)
- (c)
Mg(OH)2 (Magnesium hydroxide
- (d)
Ca(OH)2 (Calcium hydroxide