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Q301. The reaction between which of the following two reactants will produce hydrogen gas?
- AMagnesium and hydrochloric acid
- Bcopper and dilute nitric acid
- Ccalcium carbonate and hydrochloric acid
- DZinc and Nitric Acid
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Answer: A) Magnesium and hydrochloric acid
Q302. Polluted atmosphere is cleaned by which of the following?
- Aoxygen
- BRain
- Cnitrogen
- DAir
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Answer: A) oxygen
Q303. Steam and coal gas are a mixture of what?
- Acarbon dioxide and hydrogen
- Bcarbon monoxide and nitrogen
- Ccarbon monoxide and hydrogen
- Dcarbon dioxide and nitrogen
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Answer: C) carbon monoxide and hydrogen
Q304. Which of the following is not a greenhouse gas?
- Amethane
- Bnitrous oxide
- Cchlorofluorocarbon
- Dhydrogen
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Answer: D) hydrogen
Q305. Which of the following elements is an example of a 'noble gas'?
- Anitrogen
- Bhydrogen
- Cchlorine
- Dhelium
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Answer: D) helium
Q306. What is the main use of hydrofluoric acid?
- Ain glass etching (acid writing)
- Bas a bleaching agent
- Cas a very strong oxidizing agent
- DIn the preparation of strong organic fluorine compounds
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Answer: A) in glass etching (acid writing)
Q307. Which one of the following is not an example of an allotrope?
- ADiamond
- Bgraphite
- Cozone
- DSteel
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Answer: D) Steel
Q308. Which of the following is not a semiconductor?
- ASilicon
- BKrypton
- CSelenium
- DGermanium
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Answer: B) Krypton
Q309. Which one of the following is not an inert gas?
- ARadon
- BOrgan
- CCarbon
- DNeon
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Answer: C) Carbon
Q310. Which one of the following is an electronegative element?
- ALithium
- Bsodium
- CMagnesium
- DFluorine
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Answer: D) Fluorine
Q311. Which of the following gases dissolves in water to form an acidic solution?
- Acarbon dioxide
- Boxygen
- Cnitrogen
- Dhydrogen
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Answer: A) carbon dioxide
Q312. List 1 (Event) List || (compounds) A. acid rain 1. chlorofluoro carbon B. photochemical haze 2. photochemical haze C. combination with hemoglobin 3. sulfur dioxide D. destruction of the ozone layer Coot:
- AABCD 1 2 3 4
- BABCD 3 2 4 1
- CABCD 3 4 2 1
- DABCD 1 3 2 4
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Answer: A) ABCD 1 2 3 4