243. Which of the following metals is passive to concentrated trioxonltratelViacidal A. Iron B. Tin...

243. Which of the following metals is passive to concentrated trioxonltratelViacidal A.
Iron B. Tin C. Copper D. Zinc
244. The most suitable metal that can be used as a lightning conductor is A, Aluminium
B. Iron C. Copper D. Silver
245. When pure aluminium metal is heated to red-hot in the presence of nitrogen gas, the compound formed is A. AN B. AIN C. ALN D. AIN,
246. The characteristics colour of the flame shown when a copper salt moistened with concentrated hydrochloric acid on platinum wire is put on a Bunsen burner is A.
Green B. Lilac C. Yellow D. Brick-red
247. The lon that will give a white precipitate with aqueous NaOH and soluble in excess of the base is A. Zn?* 8. Mg2 C. Ca?* D. Gu?*
248. Bronze is preferred of impurities such as carbon and sulphur on iron is that they A.
Make it malleable and ductile B. Increase its melting point C. Lower its melting point D. Give it high ensile strength
249. The effect of the presence of impurities such as carbon and sulphur on iron is that they A. Make it malleable and ductile 8. Increase its melting point C. lower its melting point D. Give it high ensile strength
250. The purest form of iron which contains only about 0.1% carbon is A. Pigiron 8.
Wrought iron C. Cast iron D. Iron pyrite
ORGANIC CHEMISTRY
251. The reaction between an organic acid and an alcohol l tie aresence of an acid catalyst in know as: Saponificai Saponificaton 6. Dehydration C. Esterification?

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Asked by Mujaheed on 22nd April, 2025