In laboratory, ethylene and acetylene can be distinguished by fr

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following metals burns, if kept in air?

  • Magnesium

  • Aluminum

  • Zinc

  • Sodium


2.

Which one of the following gases burn with pop sound?

  • Hydrogen

  • Nitrogen dioxide

  • Sulphur dioxide

  • Oxygen


3.

Which one of the following metals is not a mineral?

  • Bauxite

  • Gypsum

  • Hematite

  • Limonite


4.

Which one of the following non-metals is liquid?

  • Iodine

  • Sulphur

  • Bromine

  • Phosphorus


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5.

Which scientist discovered the radioactive element radium?

  • Albert Einstein

  • Benjamin Franklin

  • Isaac Newton

  • Marie Curie


6.

The gas used in artificial ripening of green fruits is

  • ethane

  • hydrogen

  • acetylene

  • nitrogen


7.

Ozone is

  • an allotrope of oxygen

  • an isomer of oxygen

  • a compound of oxygen

  • an isotope of oxygen


8.

Brine' is

  • Common name of bleaching powder

  • aqueous solution of chlorine

  • saturated solution of NaCl

  • aqueous solution of Na2SO4


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9.

Which of the following has maximum number of atoms?

  • 16 g N2

  • 16 g of CO2

  • 16 g of CH4

  • 16 g of O2


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10.

In laboratory, ethylene and acetylene can be distinguished by

  • Br2/H2O

  • KMnO4/OH/H2O

  • Tollens' reagent

  • Fehling solution


C.

Tollens' reagent

Tollen's reagent is an alkaline solution of ammoniacal silver nitrate and is used to test for aldehydes. An aldehyde is a compound containing a functional group with the structure -CHO, consisting of a carbonyl center ( a carbon double-bonded to oxygen) with the carbon atom also bonded to hydrogen and to an R group, which is any generic alkyl or side chain.


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