HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

In which of the following molecules / ions BF₃, NO₂^– H₂0 the central atom is sp² hybridised?

Some of the following properties of two species, NO₃^– and H₃O⁺ are described below. Which one of them is correct?

The types of hybridiration on the five carbon atom from right to left in the, 2,3 pentadiene.

The percentage of s-character of the hybrid orbitals in methane, ethane, ethene and ethyne are respectively.

Which of the following conditions is not correct for resonating structures?

Define Hybridisation.

In CH₄, NH_3, and H₂O, the central atom undergoes sp3 hybridization – yet their bond angles are different. Why?

Explain Sp² hybridization in BF₃.

Calculate the lattice energy of CaCl₂ from the given data

\[\ce{Ca_{(s)} + Cl2_{(g)} -> CaCl2_{(s)}}\] ∆`"H"_"f"^0` = − 795 kJ mol⁻¹

Sublimation: \[\ce{Ca_{(s)} -> Ca-{(g)}}\] ∆`"H"_1^0` = + 121 kJ mol⁻¹

Ionisation: \[\ce{Ca_{(g)} -> Ca^2+_{(g)} + 2e^-}\] ∆`"H"_2^0` = + 2422 kJ mol⁻¹

Dissociation: \[\ce{Cl2_{(g)} -> 2Cl_{(g)}}\] ∆`"H"_3^0` = + 242.8 kJ mol⁻¹

Electron affinity: \[\ce{Cl_{(g)} + e^- -> Cl^-_{(g)}}\] ∆`"H"_4^0` = −355 kJ mol⁻¹

What type of hybridisation is possible in the following geometeries?

octahedral

What type of hybridisation is possible in the following geometeries?

tetrahedral

What type of hybridisation is possible in the following geometeries?

square planer

Which of the following is natural and human disturbance in ecology?

What is green chemistry?

What are the various methods you suggest to protect our environment from pollution?

Give Kelvin a statement of the second law of thermodynamics.

Assertion: Oxygen molecule is paramagnetic.

Reason: It has two unpaired electron in its bonding molecular orbital.

Pick out the incorrect statement from the following:

Of the following molecules, which have shape similar to carbon dioxide?

CaO and NaCl have the same crystal structure and approximately the same radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is ______.