Chemistry- Questions and Answers 28

586. A chemical reaction that takes place with the evolution of heat is called an:
Exothermic reaction

587. The substance that contains the element oxygen is:
Water

588. The metal that occurs in the pure form in earth's crust:
Platinum

589. For plant growth, the most important compound are made up of:
Nitrogen

590. The element not present in fertilizers is:
Chlorine

591. For the production of iron, the raw material used is:
Limestone

592. In natural gas, the compound present in major amounts is made up of hydrogen and:
Carbon

593. Common salt is:
Sodium chloride

594. Gasoline is obtained from crude oil by the process of:
Fractional distillation

595. Washing soda is:
Sodium carbonate

596. The ratio of different gases in airis:
Different from place to place

597. Chemically backing soda is:
Sodium bicarbonate

598. Natural rubber is a polymer of:
Isoprene

599. 'Gobar gas' contains mainly:
Methane

600. The acid used as oxidizer in rocket propellants:
Nitric acid

601. Soap is prepared by heating caustic soda with:
Potential of hydrogen

602. The acid used in batteries is:
Sulphuric acid

603. The gas inside an electric bulb is:
Argon

604. The gas whose aqueous solution is strongly acidic in nature is:
Sulphur dioxide

605. The element which forms the largest number of compounds with hydrogen is:
Carbon

606. Cooking gas is a mixture of:
Butane and propane

607. Li me water con ta ins:
Calcium hydroxide

608. Galena is the ore of:
Lead

609. Cassiterite is the ore of:
Tiu

610. The element considered as the fundamental of life:
Carbon

611. Element stored in wax:
Lithium

612. Sodium and potassium are kept in:
Kerosene

613. Rubber is soluble in:
Benzene (C6H6)

614. The only acid shows the characteristics of alkali is:
Boric acid

615. The catalyst used for the production of sulphuric acid is:
Vanadium pentoxide
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