Practice Chemistry ncert - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) A solution turns red litmus blue. The pH of solution is
(a)
(b)
(c)
(d)
Q-2) Two elements gallium and oxygen combine to form a compound Ga2O3. Which among the following is the valency of gallium ?
(a)
(b)
(c)
(d)
Q-3) The concentration of hydrochloric acid in a given solution is 10–8 M. What is the value of pH for this solution ?
(a)
(b)
(c)
(d)
Q-4) Which of the following is a weak base ?
(a)
(b)
(c)
(d)
NH4OH as it is not get completely ionized in aqueous solution.
Q-5) If pH of A, B, C and D are 9.5, 2.5, 3.5 and 5.5 respectively, then strongest acid is
(a)
(b)
(c)
(d)
Less the pH, more acidic is the solution.
The pH of acid B is 2.5 which is minimum.
Q-6) Natural indicator litmus is extracted from
(a)
(b)
(c)
(d)
Natural indicator is obtained from lichens and is purple in colour. It turns acidic solution red and basic solution blue.
Q-7) When eno salt is poured into the water, bubbles forms, which is due to
(a)
(b)
(c)
(d)
Q-8) Baking powder is
(a)
(b)
(c)
(d)
Q-9) Reaction of an acid with a base is known as –
(a)
(b)
(c)
(d)
In a neutralization reaction an acid reacts with a base and forms salt and water.
Q-10) Which of the following is considered a mineral acid ?
(a)
(b)
(c)
(d)
Q-11) Sodawater obtained by passing carbon dioxide in water is
(a)
(b)
(c)
(d)
Q-12) Which among the following statements with regard to pH scale is/are correct?
- It is a logarithmic scale.
- The scale is limited to 0-14 because the ionic product of water is about $10^{-14}$
- The lower the value of pH, the greater the acidity of the solution.
Select the correct answer using the code given below
(a)
(b)
(c)
(d)
Q-13) An unknown gas quickly dissolves in water. This gaseous aqueous solution turns red litmus into the blue. This gas produces hydrogen chloride with a white flame. This unknown gas is
(a)
(b)
(c)
(d)
Q-14) What is Neela thotha?
(a)
(b)
(c)
(d)
Q-15) Human stomach produces acid ‘X’ which helps in digestion of food. Acid ‘X’ is
(a)
(b)
(c)
(d)
Q-16) Why bases are kept in glass bottles?
(a)
(b)
(c)
(d)
Q-17) Universal indicator solution is named as such because
(a)
(b)
(c)
(d)
It can be for entire pH range.
Q-18) Which of the following pairs of substances are chemically same?
(a)
(b)
(c)
(d)
Q-19) Plaster of Paris hardens by –
(a)
(b)
(c)
(d)
$CaSO_4.{1/2}H_2O+3/2H_2O ⟶ {CaSO_4}.2H_2O$
Q-20) The chemical formula of washing soda is
(a)
(b)
(c)
(d)