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ICSE chemistry

Question 1
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i)  Among the element given below, the element with the least electronegativity is:

a)      Lithium

b)      Carbon

c)       Boron

d)      Fluorine

Solution

In the given element Lithium is least electronegative.

Question 2
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The metals of group 2 from top to bottom are Be,Mg, Ca, Sr and Ba.

1) which one  of these elements will form ions most readily and why?

2) state the common feature in the electronic configuration of all these elements.

Solution

1 ) Barium will form ions most readily because it is most metallic and ions electrons readily and form a positive ion.
2) All these element have 2 valence electrons.

Question 3
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Arrange  the following as per the instructions given in the brackets:

I)  Cs, Na, Li,K, Rb (increasing order of metallic character)

Solution

Li<Na<K<Cs<Rb

Question 4
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ii) Mg, Cl, Na, S, Si (decreasing order of atomic size)

Solution

Na>Mg>Si>S>Cl

Question 5
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Arrange  the following as per the instructions given in the brackets:
iii) Na,K,Cl,Si(increasing order of ionization energy)

Solution

K<Na<Si<S<Cl