In the electronic structure of H₂SO₄ , the total number of unshared electrons is

• 20

• 16

• 12

• 8

The correct order towards bond angle is

• sp³ < sp² < sp

• sp < sp² < sp³

• sp < sp³ < sp²

• sp² < sp³ < sp

Which of the following relation is correct ?

• I^st IE of C > I^st IE of B

• I^st IE of C < I^st IE of B

• II^nd IE of C > II^nd IE of B

• Both (b) and (c)

Which of the following configurations corresponds to element of highest ionisation energy?

• 1s², 2s¹

• 1s², 2s², 2p³

• 1s², 2s², 2p²

• 1s², 2s², 2p⁶, 3s¹

Which of the following has a bond formed by overlap of sp-sp³ hybrid orbitals?

• CH₃ - C $\equiv$ C - H

• CH₃ - CH = CH - CH₃

• CH₂ = CH - CH = CH₂

• HC $\equiv$CH

The density of a gas is found to be 1.56 g/L at 745 mm pressure and 65°C. What is the moleculer mass of the gas?

• 44.2 u

• 4.42 u

• 2.24 u

• 22.4 u

7.

Considering H₂O as weak field ligand, the number of unpaired electrons in [Mn(H₂O)₆] will be (Atomic number of Mn = 25)

• five

• two

• four

• three

The quantum numbers +$\frac{1}{2}$ and -$\frac{1}{2}$ for the electron spin represent

• rotation of the electron in clockwise and anticlockwise direction respectively

• rotation of the electron in anticlockwise and clockwise direction respectively

• magnetic moment of the electron pointing up and down respectively

• two quantum mechanical spin states which have no classical analogues

Which of the following has the highest bond order?

• N₂

• O₂

• He₂

• H₂

In long form of Periodic Table, the properties of the elements are a periodic function of their

• atomic size

• ionisation energy

• atomic mass

• atomic number