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cds- Question :

Which one of the following is not a periodic property i.e. does not show any trend on moving from one side to the other in the periodic table?

A :

Atomic size
 

B :

Valency

C :

Radioactivity

D :

Electronegativity

Answer : C
cds- Question :

Red phosphorus is used in the manufacture of safety matches.This is due to the fact that

A :

it shows phosphorescence

B :

at ordinary temperature, it is less reactive than other varieties of phosphorus

C :

it cannot be converted to white phosphorus on heating

D :

it does not react with halogen on heating

Answer : B
cds- Question :

Which one of the following is not correct

A :

Hydrogen is an element

B :

Hydrogen is the lightest element

C :

Hydrogen has no isotopes

D :

Hydrogen and oxygen form an explosive mixture

Answer : C
cds- Question :

Match List-I with List-II and select the correct answer using the code given below the Lists :

  List-I                 List-Il

(Element)      (Property/ Use)
   Mg        1.Gives red colour to flame
   Ca         2.Sulphate compound used

                    changes alimentary canal of a Patient
    Sr         3.Traps the energy of sunlight

                     in photosynthesis   
    Br         4.Control of muscle contraction

A :

A B C D
2 4 1 3

B :

A B C D
2 1 4 3

C :

A B C D
3 4 1 2

D :

A B C D
3 1 4 2

Answer : C
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