Chemistry- Questions and Answers 23

436. Which metal is used in the fireworks to give them a purple color?
Rubidium

437. Which is the least electronegative & the most electroposltive 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 clement 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 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 con fer red color to glass?
Selenium

450. If the characteristics of a mixtureare the same through out, it is a······mixture
Homogeneous mixture

451. What are the examples for the homogeneous mixtures?
Sea water, 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 waler can be removed by •·•••••
Boiling

462. Which ls 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 fire, watering plants & washing off dirt from streets?
Natural hard water

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