239. Which of the following is a bleaching agent added in the detergents to facilitate removal of stains caused due to blood, tea etc?
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240. For the hydrogenation of oils (i) __________ is commonly used as catalyst and (ii) __________ is a catalyst poison.
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241. The main product of high temperature carbonisation of coal is
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242. The drug used in contraceptives is
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243. Chemical formula of 'salt cake' is
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244. Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about
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245. Polymethyl methacrylate (PMMA) is known as
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