In the hydrocarbon

     CH₃-CH=CH-CH₂-C$\equiv$CH

     6      5     4   3      2    1

The state of hybridisation of carbons 1,3 and 5 are in the following sequence

(1) sp², sp, sp³                       

(2) sp, sp³, sp²

(3) sp, sp², sp³                       

(4) sp³, sp², sp

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is:
(1) BeCO₃ < MgCO₃ < K₂CO₃ < CaCO₃

(2) BeCO₃ < MgCO₃ < CaCO₃ < K₂CO₃

(3) MgCO₃ < BeCO₃ < CaCO₃ < K₂CO₃

(4) K₂CO₃ < MgCO₃ < CaCO₃ < BeCO₃

Which of the following compounds has a higher hydration energy than the lattice energy?

1. BaSO₄                           

2. MgSO₄

3. CaSO₄                           

4. SrSO₄

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

(1) ClF₃

(2) BF₃

(3) AlF₃

(4) NF₃

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2 D). This is because:

(1) in NH₃ as well as in NF₃ the atomic dipole and bond dipole are in the same direction
(2) in NH₃ the atomic dipole and bond dipole are in the same direction whereas in NF₃ these are in opposite directions
(3) in NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions
(4) in NH₃ the atomic dipole and bond dipole are in the opposite directions whereas in NF₃ these are in the same directions

The correct order of electronegativity of hybrid orbitals of carbon is:

(1) sp>sp²<sp³             

(2) sp>sp²>sp³

(3) sp<sp²>sp³             

(4) sp<sp²<sp³

Which of the following species has a linear shape?

(1) ${\mathrm{NO}}_2^{-}$

(2) SO₂

(3) ${\mathrm{NO}}_2^{+}$

(4) O₃

Which of the following is the most basic oxide?
(1) Al₂O₃

(2) Sb₂O₃

(3) Bi₂O₃

(4) SeO₂

Which of the following is not a correct statement?

(1) The electron-deficient molecules can act as Lewis acids

(2) The canonical structures have no real existence

(3) Every AB₅ molecule does, in fact, have square pyramid structure

(4) Multiple bonds are always shorter than corresponding single bonds

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

1. 2

2. 3

3. 4

4. 1