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
PSC Solved Question Papers ---> Click here
PSC TODAY's EXAM RESULTS ---> Click here
PSC EXAM PROGRAMME -> Click here
CURRENT AFFAIRS QUESTIONS -> Click here
PSC Degree Level Questions & Answers - Click here
PSC 10th, +2 Level Questions & Answers - Click here
PSC RANK LISTS / SHORTLISTS -> Click here
TEACHING APTITUDE TEST (K-TET, C-TET,, etc.) ---> Click here* SCERT KERALA TEXTBOOKS FOR CLASS II, IV, VI, VIII, IX, X, XII – FREE DOWNLOAD ---> Click here
* NCERT & CBSE TEXTBOOKS FOR ALL CLASSES – FREE DOWNLOAD ---> Click here
* SCERT TEXTBOOKS SOLUTIONS FOR ALL CLASSES ---> Click here
* NCERT & CBSE TEXTBOOKS SOLUTIONS FOR ALL CLASSES ---> Click here
0 Comments