Born cycle is used to determine:

The element with strong electropositive nature is:

Octet rule is not valid for the molecule:

The correct order of reactivity of halogens is

NH₃  has higher boiling point than expected, because :

The screening effect of -electrons is:

Which has the largest first energy?

In which of the following molecules are all thebonds not equal?

The bond between two identical non-metal atoms has a pair of electrons:

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is:

Which element of second period forms most acidic oxide?

The electronic configuration of four elements are given below. Which element does not belong to the same family?

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of  +2 oxidation state will be there in which of the following order? (At. no.Cr=24, Mn=25, Fe=26, Co=27)

Which is correct in the following?

The linear structure is possessed by:

Which of the following has largest ionic radius?

In the cyanide ion, the formal negative charge is on:

The size of ionic species is correctly given in the order:

Which statement is wrong?

Which of the following atoms has minimum covalent radius?

The second electron affinity is zero for

For alkali metals, which one of the following trends is incorrect?

If  Aufbau rule is not followed, K-19 will be placed in

The electronegativity order of  and  is:

Which has the minimum bond energy?

The bond angle in H₂S (for H - S-H) is:

In which of the following arrangements, the sequence is not strictly according to the property written against it?

The tenth elements in the Periodic Table resembles with the

Which is not the correct order for the stated property?

The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to:

Which of the following oxides is most acidic in nature?

In the formation of NaCl by combination of  Na and Cl :

The molecule having three folds of axis of symmetry is:

The covalent compound  has the polar character because:

If the bond has zero percent ionic character, the bond is: 

Mendeleef’s Periodic Table is upset by the fact that

The incorrect statement among the following is:

Which one of the following is an amphotericoxide?

Which one is correct?

In which one of the following pairs the radius of the second species is greater than that of the first?

Atomic radii of fluorine and neon in angstrom unit are respectively given by:

According to IUPAC nomenclature, a newly discovered element has been named as Uun. The atomic number of the element is

The correct order of increasing electron affinity of halogens is

Al element  has 3electrons in -orbitals and also belongs to III period. Its molecular formula should be:

Which of the following sequence regardingionisation potential of coinage metal is correct: