Important Questions of Chemistry General Knowledge | Zigya

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11.

Who among the following has explained the phenomenon of photoelectric effect?

  • Max Planck

  • Albert Einstein

  • Neils Bohr

  • Ernest Rutherford


12.

The equivalent weight of oxalic acid in C2H2O4.2H2O is

  • 45

  • 63

  • 90

  • 126


13.

On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds?

  • Copper carbonate

  • Copper oxide

  • Copper sulphate

  • Copper nitrate


14.

Which one of the following will NOT produce carbon dioxide on reacting with an aqueous solution of hydrochloric acid?

  • Limestone

  • Quick Lime

  • Chalk

  • Marble


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15.

Which one of the following substances is NOT a mixture?

  • Ice

  • Ice-cream

  • Air

  • Honey


16.

Which one of the following is an example of Salt Crystal growth?

  • Chemical weathering

  • Physical weathering

  • Biological weathering

  • Biological weathering


17.

Tooth enamel is made up of which one of the following calcium compounds?

  • Calcium carbonate

  • Calcium sulphate

  • Calcium hydroxide

  • Calcium phosphate


18.

The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?

  • One

  • Two

  • Three

  • Four


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19.

A sample of oxygen contains two isotopes of oxygen with masses 16 u and 18 u respectively. The proportion of these isotopes in the sample is 3 : 1. What will be the average atomic mass of oxygen in this sample?

  • 17.5 u

  • 17 u

  • 16 u

  • 16.5 u


20.

Which one of the following is a heterogeneous mixture?

  • Hydrochloric acid

  • Vinegar

  • Milk

  • Soda water


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