Mg has relatively higher ionisatin enthalpy than Al although the atomic number of the latter is more than the former-explain why? What are the names given to eka-aluminium and eka-silicon predicted by mendeleev?

Explain why nitrogen has higher first ionisation enthalpy than oxygen.

Conjugated dienes are relatively more stable than isolated dienes having same number of carbon atoms-why ?

Diamond and solid rhombic sulphur both are covalent solids but latter has very low melting point than former. Explain why?

A and B are two elements with atomic numbers 9 and 17 respectively. Explain why the element A is a more powerful oxidisng agent than the element B.

Among the second period elements the actual ionisation enthalpies are in the order Li lt B lt Be lt C lt O lt N lt F lt Ne. explain why? (1) Be has higher Delta_(i) H than B (2) O has lower Delta_(i)H than N and F?

Explain why atomic radius of Ga is less than that of Al? AlCI_3 forms .dimer but BCl_3 does not - Explain? What is corrundum?

A DNA molecule has higher melting point having more number of GC pairs than another DNA molecule which has more number of AT pairs. What conclusion can be drawn from this fact?

In this question has statement I and statement II of the four choice given after the statement choose the one that best describes the two statements Statement-Number of waves in an orbit of atom is equal to number of that orbit. Statement-I "_ 24Cr has more paramagnetic nature than "_ 25Mn Statement-II Cr has more than of unpaired electrons than Mn

In this question has statement I and statement II of the four choice given after the statement choose the one that best describes the two statements Statement-Number of waves in an orbit of atom is equal to number of that orbit. Statement-I The 3p orbital has higher energy level than 3s in He^+ ion. Statement-II The energy of an orbital depends upon n and l