General Science - Chemistry MCQs

41. When a piece of quicklime is dipped in water, it gives bubbles. This bubbling is due to which of the following ?
[A] Oxygen
[B] Carbon Dioxide
[C] Water Vapour
[D] Hydrogen

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42. Which among the following acid is used to ascertain, whether pure Ghee has been adulterated with Vanaspati or Margarine?
[A] Sulphuric Acid
[B] Nitric Acid
[C] Hydrochloric Acid
[D] Boric Acid

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43. Mizoroki-Heck reaction is catalyzed by which of the following metals?
[A] Rhodium
[B] Sodium
[C] Palladium
[D] Osmium

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44. Which among the following is used in preparing windows for X-Ray Tubes ?
[A] Barium
[B] Beryllium
[C] Magnesium
[D] Calcium

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45. Which among the following first increases than decreases in a Period of a periodic table?
[A] metallic property
[B] Chemical Reactiveness
[C] Valency
[D] Electron affinity

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46. Which among the following were not discovered by the time , Mendeleev published his periodic table?
[A] Lathanides
[B] Actinides
[C] Noble Gases
[D] Halogens

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47. Ekaboron was an element predicted by Mendeleev and he leaved a space for it in his Periodic Table. Later Ekaboron was identified with _____?
[A] Gallium
[B] Scandium
[C] Technitium
[D] Germanium

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48. Which among the following allotropes of Oxygen is found in 6 phases under various pressures and temperatures?
[A] Ozone
[B] Tetra oxygen
[C] Octaoxygen
[D] None of them

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49. Buckeyballs are basically the allotropes of _________?
[A] Carbon
[B] Sulfur
[C] Phosphorus
[D] Calcium

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50. What is the number of synthetic elements in periodic Table?
[A] 18
[B] 22
[C] 24
[D] 26

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