Practice Gk questions set 2 - 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) 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-3) Which of the following is a weak base ?
(a)
(b)
(c)
(d)
NH4OH as it is not get completely ionized in aqueous solution.
Q-4) 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-5) Which of the following is an alkali ?
(a)
(b)
(c)
(d)
KOH; Alkali is a base which are water soluble.
Q-6) A solution reacts with crushed egg–shells to give a gas that turns lime–water milky. The solution contains
(a)
(b)
(c)
(d)
The egg shells are made up of calcium carbonate.
When it reacts with HCl it liberates CO2 gas which turns lime water into milky
$CaCO_3 + 2HCl ⟶ CaCl_2 + H_2O + CO_2$
Q-7) Which acid is considered as a basic chemical in Industry?
(a)
(b)
(c)
(d)
Q-8) When vinegar reacts with baking soda the gas evolved is
(a)
(b)
(c)
(d)
Vinegar is acetic acid and baking soda is sodium hydrogen carbonate (a base).
Whenever an acid reacts with a metal carbonate it produces carbon dioxide gas.
CH3COOH + NaHCO3 ⟶ CH3COONa + H2O + CO2
Q-9) A base which dissolves in water is called
(a)
(b)
(c)
(d)
Bases soluble in water are called alkalis.
Only the oxides of sodium, potassium, and calcium are soluble in water, so these form sodium hydroxide potassium hydroxide and calcium hydroxide. These are the strongest bases.
Q-10) Plaster of paris is made from –
(a)
(b)
(c)
(d)