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Friday, 6 March 2020

Chemistry- Questions and Answers 19

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:


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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