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Friday, 6 March 2020

Chemistry- Questions and Answers 15

Chemistry- Questions and Answers 15
436. Which metal is used in the fireworks to give them a purple colour? 
Rubidium

437. Which is the least electronegative & the most electropositive clement? 
Caesium

438. Which metal is widely used in the atomic clocks?
Caesium 

439. Which metal is stored in vacuum-sealed borosilicate glass ampoules?
Caesium 

440. Which is the most corrosion-resistant metal? 
Iridium

441. Which is the least abundant stable element in the Earth's crust?
Osmium 

442. Which metal was discovered by William Gregor in 1791 & named by Martin Klaproth?
Titanium 

443. Which metal is extracted via the Kroll Process or the Hunter Process?
Titanium 

444. Which compound of Titanium is used in the manufacture of white pigments?
Titanium dioxide 

445. Which metal is commercially produced through the FFC Cambridge Process?
Titanium 

446. Which element is named for the Earth? 
Tellurium 

447. Which compound of Selenium is used as an anti-dandruff agent in shampoos? 
Selenium disulfide

448. Which acid is capable of dissolving gold?
Selenic acid 

449. TI1e compounds of which element confer red colour to glass? 
Selenium 

450. If the characteristics of a mixture are the same throughout, it is a······mixture 
Homogeneous mixture

451. What are the examples for the homogeneous mixtures?
Seawater, Sugar solution, air, brass, bronze

452. If the characteristics of a mixture are not the same in all the parts of the mixture, it is a···· mixture
Heterogeneous mixture 

453. What are the examples of the heterogeneous mixtures? 
Muddy water, Granite

454. A heterogeneous mixture that contains solid particles sufficiently large for sedimentation is known as ······· 
Suspension

455............ is a mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance 
A colloid

456. Milkisanaptcxamplefor······· 
Emulsion

457. What is the name oft he mixture of two or more liquids that are normally unmixable? 
Emulsion 

458. The water which is totally devoid of calcium & magnesium salts is known as ······ 
Soft water 

459. The soap does not lather in----- water
Hard water 

460. 'TI1c presence of which salts of calcium & magnesium causes temporary hardness of water? 
Bicarbonate salts

461. The temporary hardness of water can be removed by •·••••• 
Boiling 

462. Which is the most commonly used chemical substance to remove the permanent hardness of water?
Sodium carbonate 

463. If the content of the salts of magnesium & calcium is more than 17.I ppm in water, it is considered as------- 
Hard water

464. What is more useful for putting out the fire, watering plants & washing off the dirt from streets? 
Natural hard water

465. What is the use of the Clark method? 
Remove temporary hardness of water  

466. ln Clark method, what is added to water to remove the temporary hardness?
Lime (Calcium hydroxide) 

467. Which element is used for radiographic imaging? 
Barium 

468. Development of unpleasant smell & taste in oil & fat-containing food items due to oxidation of atmospheric oxygen is called------?
Rancidity 

469. Who discovered radiocarbon dating? 
Willard Frank Libby 

470. Which is the rarest gas in the atmosphere?
Radon 

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