Question 81. Match List I and List II and select the correct answer by using the codes given below.
List I                           List II
A. Smoke       1. Dispersion of gas in liquid
B. Gel             2. Dispersion of solid in solid
C. Emulsion   3. Dispersion of liquid in liquid
D. Foam         4. Dispersion of liquid in solid
                        5. Dispersion of solid in gas

Question 82. Match List I and List II and select the correct answer by using the codes given below.
List I                        List II
A. Water gas       1. CH₄
B. Producer gas  2. CO + H₂
C. Coal gas           3. H₂ + CH₄ + CO₂
D. Gobar gas       4. CO + N₂

Question 83. Match List I and List II and select the correct answer by using the codes given below.
List I                                                 List II
(Substances)                                      (Use)
A. Zeolite                                   1. Purgative
B. Sodium thiosulphate          2. Safety matches
C. Magnesium sulphate          3. Dry cell
D. Graphite                               4. Purification
                                                    5. Photography

Question 84. Match List I and List II and select the correct answer by using the codes given below.
List I                                                                                                  List II
A. Exclusion                                                                                 1. Balmer
B. Uncertainty                                                                             2. Heisenberg principle
C. Atomic spectrum of hydrogen atom in visible region     3. Schrodinger
D. Wave mechanics                                                                   4. Pauli

Question 85. Match List I and List II and select the correct
List I (Nature of solution)                 List II (ph)
A. Weakly acidic                                 1. 1.5
B. Strongly acidic                               2. 12.5
C. Weakly basic                                 3. 6.5
D. Strongly basic                               4. 7.5

Question 86. Which of the following is not correctly matched?
Element           Symbol

Question 87. The fractionation of petroleum gives many products. What is the correct order in which the various fractions mentioned below separate from petroleum?
(a) Gasoline
(b) Kerosene
(c) Diesel oil
(d) Lubricating oil

Question 88. Match List I and List II and select the correct answer by using the codes given below
List I                                    List II
A. Nitroglycerine            1. Anaesthetic
B. Nitrous                        2. Antiseptic
C. Potassium Chloride   3. Explosive
D. Picric acid                   4. Electrolyte

Question 89. Consider the following statements
(a) Marble is a constituent of tooth paste.
(b) Gypsum is used for the manufacture of ammonium sulphate
Which of the statements given above is/are correct?

Question 90. Water is a good fire extinguisher because
(a) the specific heat of water is high
(b) steam, formed as the water boils in contact with the burning object, forms an envelop and shuts off oxygen supply