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LDC Examination Expected Questions - 28

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CHEMISTRY
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271. 'Killed steel' mean ?
Answer :- Have zero % phosporous

272. Cyanide process is used for the extraction of ..........
Answer :- Gold and Silver

273. The elements which have the same number of neutrons are called .........?
Answer :- Isotones

274. The chemical name of Gypsum is ..........?
Answer :- Calcium Sulphate



275. Which of the following is a physical change ?
[Burning of cooking gas; Souring of milk; Digestion of food; Dissolution of sugar into water]
Answer :- Dissolution of sugar into water

276. The pH value of an aqueous ?
Answer :- Nearlt 7

277. The ....... is called the fourth state of matter?
Answer :- Plasma

278. Steel is an alloy of ......... and ..........?
Answer :- Carbon and Tin

279. 'Black Twins' is the name given to .........?
Answer :- iron and Coal


280. 'Bayer' is the trade name of ..........?
Answer :- Insecticides
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