Chemistry- Questions and Answers 19
576. The gas emitted by burning wood is mainly:Carbon dioxide
577. Containers for carrying strong acids are made of:
Lead
578. The process of elimination of water from any system is called:
Dehydration
579. The pH of human blood is:
7.4
580. Tetraethyl lead (TEL) is added to petrol for:
Increasing anti-knocking rate
581. The number of isotopes in which hydrogen can exist is:
3
582. The gas used in fire extinguishers is:
Carbon dioxide
583. Which element is present in all acids?
Hydrogen
584. Which pair of metals used in the manufacture of stainless steel?
Chromium and steel
585. In order to lower the temperature below 0° C, the substance mixed with ice is:
Sodium chloride
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 air is:
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 an 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
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