EASY
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IMPORTANT
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Anomalous behaviour of nitrogen is due to

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Important Questions on Periodic Classification of Elements

MEDIUM
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IMPORTANT
Which of the following statements concerning ionisation energy is not correct?
HARD
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IMPORTANT
All the elements in a group (family) have a common valency. For example, all the elements of the carbon family (carbon, silicon, germanium, tin and lead) have the common valency four. However, some of these elements can also have a valency two. Which of the following have a valency two?
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IMPORTANT

Match List I with List II and select the correct combination of ions and isoelectronic ions using the codes given below the lists.

List I List II
A. SO2 1. CO
B. N2 2. Cl-
C. H- 3. CO32-
D. K+ 4. Li+

 

HARD
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IMPORTANT

Match the properties given in Column I with the metals given in Column II and choose the correct option from the codes given below.

Column I(Property) Column II(Metal)
A. Element with the highest second ionisation enthalpy 1. Co
B. Element with the highest third ionisation enthalpy 2. Cr
C. M in MCO6 is 3. Cu
D. Element with the highest heat of atomisation 4. Zn

 

EASY
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IMPORTANT
Which one of the following elements exists in the liquid state at room temperature?
MEDIUM
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IMPORTANT

Which among the following is correct regarding Ne20,Na+23, 19F- and Mg2+24?