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Which one of the following is an amphoteric oxide?
Elements which generally exhibit multiple oxidation states and whose ions in aqueous medium are usually coloured aand whose ions in aqueous medium are usually coloured are:
Transition elements exhibit variable oxidation states because they release electrons from the following orbits:
In II period most acidic oxide is formed by:
Elements of group IB and IIB are called:
Which element has the greatest tendency to lose electron?
The outer electron configuration of Gd (Atomic no. 64) is:
The radius of La3+ (at. no. 57) is 1.06 The radius of Lu3+ (at.no. 71) might be:
Which of the following transition metal ions has the lowest density?
Ionic radii are
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Which one of the following has the highest melting point?
Which one is a metalloid?
Zn and Cd do not show variable valency like 'd' block elements due to :
In the long form of periodic table, the elements having lowest ionization potential are placed in:
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?