Q. The decomposition of vegetable matter in compost is an example of _______ reaction.
The correct answer was: Exothermic
Q. In graphite, each carbon atom bonds with other carbon atoms in the same plane, forming a hexagonal arrangement.
The correct answer was: Three
Q. The aqueous solution of sodium chloride is called _______.
The correct answer was: Brine
Q. _______ is used to remove the permanent hardness of water.
The correct answer was: Washing soda
Q. In the earth’s crust, only _______ carbon exists, and that too in the form of salts.
The correct answer was: 0.002%
Q. The atmosphere of Venus is composed of thick white and yellow clouds of _______.
The correct answer was: Sulfuric acid
Q. Rock salt is mined like _______.
The correct answer was: Coal
Q. The major acid in blood is often used as an antacid.
The correct answer was: Magnesium hydroxide
Q. If a metal is mercury, then the alloy is called _______.
The correct answer was: Quicksilver amalgam
Q. Generally, _______ have a sweet fragrance.
The correct answer was: Esters
Q. Metals like potassium and sodium react rapidly with _______.
The correct answer was: Cold water
Q. The atomic number of chlorine is _______.
The correct answer was: 17
Q. Sodium carbonate is obtained by heating _______.
The correct answer was: Soda ash
Q. A bee sting injects an acid that causes pain and discomfort. The application of a mild alkali like _______ to the sting site provides relief.
The correct answer was: Milk of magnesia
Q. After two to three days of plastering, _______ forms and makes the walls shine.
The correct answer was: Calcium carbonate
Q. Dental enamel is the hardest substance in the body, made of ________.
The correct answer was: Calcium hydroxyapatite
Q. The least good conductors of heat are _______.
The correct answer was: Lead and mercury
Q. When a magnesium ribbon is burned in oxygen, it is converted into _______.
The correct answer was: Magnesium oxide
Q. When ferrous sulfate crystals [FeSO₄, 7H₂O] are heated, they release _______ and the color of the crystals changes.
The correct answer was: Water
Q. CO(g) + 2H₂(g) → CH₃OH(g); X is
The correct answer was: 1 atm
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