Moving from right to left in a periodic table, the atomic size is : [JEE 1995]
The increasing order of electronegativity in the following elements :
One element has atomic weight 39. Its electronic configuration is 1 s2, 2s2, 2p6, 3s2, 3p6, 4s1. The true statement for that element is : [JEE 1995]
An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is.
The decreasing size of K+, Ca2+, Cl- & S2- follows the order : [REE 1995]
Which of the following oxide is neutral ? [JEE 1996]
Which of the following has the maximum number of unpaired electrons
The following acids have been arranged in the order of decreasing acid strength. Identify the correct order
The incorrect statement among the following is : [JEE 1997]
Which of the following are amphoteric ?
Identify the wrong sequence of the elements in a group
Anhydrous AlCl3 is covalent. From the data given below predict whether it would remain as a molecule or converts into ions in aqueous solution. [JEE 1997]
[L.E. for AlCl3 = 5137 kJ/mol]
ΔH hydration for Al3+ = -4665 kJ/mol;
ΔHhydra for Cl- = -381 kJ/mol.
Which one of the following statement (s) is (are) correct ?
Assertion : F atom has less negative electron gain enthalpy than Cl atom [JEE 2000]
Reason : Additional electron is repelled more efficiently by 3p electron in Cl atom than by 2p electron in F atom.
Assertion : Al(OH)3 is amphoteric in nature.
Reason : Al - O and O - H bonds can be broken with equal case in Al(OH)3 [JEE 2000]
The correct order of radii is : [JEE 2000]
The correct order of acidic strength is : [JEE 2000]
In the third period of the periodic table the element having smallest size is
The set representing correct order of IP1 is [JEE 2001]
Identify the least stable ion amongst the following : [JEE 2002]
Identify the correct order of acidic strengths of CO2, CuO, CaO, H2O :