12 Class Fsc Part 2 Short Questions Online Preparation for Chemistry chapter wise

Online Short Questions For Chapter 2 "12th Class Chemistry Chapter 2 Short Questions Preparation "

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Chemistry - 12th Class Chemistry Chapter 2 Short Questions Preparation

Question # 1

Write points to show peculiar behavior of Berylium.

  • Ans 1: 1) Beryllium metal is almost as hard as iron and hard enough to scratch glass.
    2) Melting and boiling points of beryllium are higher than other alkaline earth metals.
    3) Beryllium is least reactive metal in the group.It is resistant to complete oxidation and stable in air a ordinary temperature but oxidize rapidly at about 800oC.
    4) Beryllium is not tarnished by atmospheric attack but the metal soon loses the silvery appearance.
    2Be + O2800 2BeO
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Prepare Complete Set Wise Questions For Chapter 2 "12th Class Chemistry Chapter 2 Short Questions Preparation "

12th Class Chemistry Chapter 2 Short Questions Preparation - Set 1

Question # 1

Write points to show peculiar behavior of Berylium.

  • Ans 1: 1) Beryllium metal is almost as hard as iron and hard enough to scratch glass.
    2) Melting and boiling points of beryllium are higher than other alkaline earth metals.
    3) Beryllium is least reactive metal in the group.It is resistant to complete oxidation and stable in air a ordinary temperature but oxidize rapidly at about 800oC.
    4) Beryllium is not tarnished by atmospheric attack but the metal soon loses the silvery appearance.
    2Be + O2800 2BeO
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12th Class Chemistry Chapter 2 Short Questions Preparation - Set 2

Question # 1

Write any two points of difference of Be with its family members.

  • Ans 1: Beryllium is the lightest member of the series,.The main points of difference are:
    1) Beryllium metal is almost as hard as iron and hard enough to scratch glass.The other alkaline earth metals are much softer than beryllium but still harder than the alkali metals.
    2) The melting and boiling points of beryllium are higher than other alkaline earth metals.
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12th Class Chemistry Chapter 2 Short Questions Preparation - Set 3

Question # 1

Write any two points of difference of Be with its family members.

  • Ans 1: Beryllium is the lightest member of the series,.The main points of difference are:
    1) Beryllium metal is almost as hard as iron and hard enough to scratch glass.The other alkaline earth metals are much softer than beryllium but still harder than the alkali metals.
    2) The melting and boiling points of beryllium are higher than other alkaline earth metals.
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12th Class Chemistry Chapter 2 Short Questions Preparation - Set 4

Question # 1

What happens when: 1) Li2CO3 2) Na2CO3is heated.

  • Ans 1: Lithium has low electropositive character,thus its carbonate are not so stable and therefore decomposed giving lithium oxide on heating.
    Li2CO3----------------->Li2O + CO2
  • Ans 2: At temperature below 35.2 oC,Na2CO3crystallizes out from water as Na2CO3.10H2O which is called washing soda.Above this temperature it crystallizes as Na2CO3.H2O. On standing in air,Na2CO3.10H2O slowly loses.
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12th Class Chemistry Chapter 2 Preparation

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