Live practice

The Celsius-to-Fahrenheit function is \(t(C)=9\frac{C}{5}+32\). Find \(t(0),t(28),t(-10)\), and the Celsius value giving \(212^\circ F\).

Out of benzene, m–dinitroben ene and toluene which will undergo nitration most easily and why?

Explain the principles used to estimate halogens, sulfur and phosphorus quantitatively in an organic compound.

Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

At 1127 K and 1 atm, a CO/CO₂ mixture in equilibrium with solid carbon is 90.55% CO by mass. Determine Kc for C(s)+CO₂(g)⇌2CO(g).

Which has the larger dipole moment, NH₃ or NF₃, and why?

Evaluate the claim that nitrogen has electronegativity 3.0 in every compound.

(i) Write configurations of H⁻, Na⁺, O²⁻ and F⁻. (ii) Identify atomic numbers for outer configurations 3s¹, 2p³ and 3p⁵. (iii) Identify atoms represented by [He]2s¹, [Ne]3s²3p³ and [Ar]4s²3d¹.

For A + B₂ → AB₂, identify the limiting reagent, if any, in: (i) 300 A atoms + 200 B₂ molecules(ii) 2 mol A + 3 mol B₂(iii) 100 A atoms + 100 B₂ molecules(iv) 5 mol A + 2.5 mol B₂(v) 2.5 mol A + 5 mol B₂.

Find consecutive positive odd integers below 10 whose sum is greater than 11.