2 gm of aluminium is treated separately with excess of dil. H2SO4

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Glycerine contains:

  • 1 ° carbon

  • 2° carbon

  • 3° carbon

  • both 1 ° and 2° carbon


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22.

2 gm of aluminium is treated separately with excess of dil. H2SO4 and excess of NaOH, the ratio of volume of hydrogen evolved is :

  • 1 : 1

  • 2 : 3

  • 1 : 2

  • 2 : 1


A.

1 : 1

2g of aluminium is treated separately with excess of dil. H2SO4 and excess of NaOH, the ratio of volume of hydrogen evolved is 1 : 1.


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23.

The main component of glass which gives heat resistance to laboratory glassware is 

  • PbO

  • MgO

  • B2O3

  • Al2O3


24.

The order of acidic strength of boron trihalides is :

  • BF3 < BCl3< BBr3 <BI3

  • BI< BBr3 < BCl3 < BF3 

  • BCl3< BBr3 <BI< BF3 

  • BBr3 <BI< BF3  < BCl3 


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25.

Match list I and list II and select the correct answer using the code given below the lists :

       

List I Nuclear reactor components List II substance
1. Moderator A.Uranium
2. Control rods  B.Graphite
3. Fuel rods C.Boron
4.Coolant D.Lead
  E.Sodium

  • 1-B, 2-A, 3-C, 4-E

  • 1-B, 2-C, 3-A, 4-E

  • 1-E, 2-B, 3-A, 4-C

  • 1-C, 2-D, 3-A, 4-B


26.

Pyrosilicate ion is

  • SiO22-

  • Si2O76-

  • SiO42-

  • SiO3-


27.

In the preparation of amorphous silicon, HF is used to remove

  • Mg

  • SiO2

  • Si

  • None of these


28.

What is the molecular formula of borazole ?

  • B2H6

  • B6N6H6

  • B3N3H6

  • B3N3H3


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29.

The oxidation state shown by silicon when it combines with strongly electropositive metals is

  • -2

  • -4

  • +4

  • +2


30.

Which one of the following is correct about stability of the given ions?

  • Pb2+ > Pb4+

  • Pb4+ > Pb2+

  • Si2+ > Si4+

  • Sn4+ > Sn2+


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