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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
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
[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
Answer :- Insecticides
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