61. Biogas is formed through
62. Cement is formed by strongly heating a mixture of
63. Consider the following statements.
1. Photochromic lenses are lenses that darken on exposure to ultraviolet light.
2. Photochromic properties is due to embedded microcrystalline of silver chloride in the glass.
Which of the statement(s) given above is/are correct?
1. Photochromic lenses are lenses that darken on exposure to ultraviolet light.
2. Photochromic properties is due to embedded microcrystalline of silver chloride in the glass.
Which of the statement(s) given above is/are correct?
64. Consider the following statements.
1. Glass wool has tensile strength greater than steel.
2. Glass wool is fire proof.
3. Glass wool has high electrical conductivity and absorbs moisture.
4. Glass wool is used to prepare libre glass.
Which of the statements given above are correct?
1. Glass wool has tensile strength greater than steel.
2. Glass wool is fire proof.
3. Glass wool has high electrical conductivity and absorbs moisture.
4. Glass wool is used to prepare libre glass.
Which of the statements given above are correct?
65. Match the species in List I with their types List II.
List-I
List-II
a. DDT
1. Photochemical smog
b. NaClO3
2. Disinfectant
c. Cl2
3. Herbicides
d. PAN
4. Pesticides
| List-I | List-II |
| a. DDT | 1. Photochemical smog |
| b. NaClO3 | 2. Disinfectant |
| c. Cl2 | 3. Herbicides |
| d. PAN | 4. Pesticides |
66. By-product obtained by soap industry is
67. Which one among the following agents is added to domestic LPG cylinder to help in the detection of gas leakage?
68. Commercially, sodium bicarbonate is known as
69. Zinc sulphide is commonly used as
70. Match List-I (Type of glass) with List-II (Composition) and select the correct answer:
List-I
List-II
a. Soda glass
1. Mixture of potassium and lead silicates
b. Crown glass
2. Mixture of sodium, barium, zinc and magnesium silicates
c. Flint glass
3. Mixture of sodium, zinc and aluminium silicates
d. Pyrex glass
4. Mixture of sodium and calcium silicates
| List-I | List-II |
| a. Soda glass | 1. Mixture of potassium and lead silicates |
| b. Crown glass | 2. Mixture of sodium, barium, zinc and magnesium silicates |
| c. Flint glass | 3. Mixture of sodium, zinc and aluminium silicates |
| d. Pyrex glass | 4. Mixture of sodium and calcium silicates |
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