21- Which of the following is/are an example of Passive metals?
(A) Chromium
(B) Nickel and tin
(C) Aluminium
(D) All of the above
22- [Ca(OH)2]
(A) Chemical formula of sodium hydroxide
(B) Chemical formula of calcium hydroxide
(C) Reaction formula of calcium hydroxide
(D) Reaction formula of sodium hydroxide
23- Which of the following is/are different forms of calcium carbonate?
(A) Limestone
(B) Chalk
(C) Marble
(D) All of the above
24- The reaction between an acid and a base to give a salt and water is known as …………………..reaction.
(A) Metallic
(B) General
(C) Olfactory
(D) Neutralization
25- The process of dissolving an acid or a base in water is a highly …………………….process.
(A) None of the below
(B) Normal
(C) Endothermic
(D) Exothermic
26-The chemical substances which give different colour in acidic and basic solution are called
(A) Indicator
(B) Litmus
(C) Alkaline
(D) None of the above
27- …………..indicators are used to determine the presence of acids and bases with their smell.
(A) Synthetic
(B) Olfactory
(C) Natural
(D) Both Natural and Olfactory
28- Which of the following statement is correct?
| a. Red Litmus reacts with bases and changes its colour into blue.
b. Blue litmus reacts with acid and changes its colour into red. c. Turmeric is a natural indicator; it changes its reddish brown when it reacts with bases. d. Different values of acidity and alkaline of solution can be indicated by different indicators |
(A) Option b and c are correct
(B) Option a and d are correct
(C) All options are correct
(D) All options are incorrect
29- Who said that acids are hydrogenous substances and release hydrogen ions (H+) in aqueous solution?
(A) Thomas
(B) Nicolas
(C) Errhenius
(D) Arrhenius
30- Match the following
| List –I List –II
a. HCL 1. Carbonic acid b. H2 SO4 2. Sulphuric acid c. HNO3 3. Nitric Acid d. H2 CO3 4. Hydrochloric acid |
(A) a-4, b-2, c-3, d-1
(B) a-2, b-3, c-4, d-1
(C) a-1, b-2, c-3, c-4
(D) a-3, b-2, c-1, d-4
ANSWERS:
21-(A), 22-(B), 23-(D), 24-(D), 25-(D), 26-(A), 27-(B), 28-(C), 29-(D), 30-(A)