Physical Chemistry Answers

What is the frequency of light that has a wavelength of 980 nm?

What is the boiling point of a solution that contains 12.5g biphenyl, C12H10, in 100g of bromobenzene? The normal boiling point of bromobenzene is 156°C, and kb for bromobenzene is +6.26°C/m.

If A and B are two atoms bonding along tha z-axis, predict giving reason which of the following orbitals can combine :

1. 1s and 2s

In our college laboratory a container containing 5 litres of a commercial sample of

hydrochloric acid (36.2 % by weight with a density of 1.19 g/ml) developed a crack and all

the HCI was spilt on the floor. It can be neutralised with limestone powder.

(atomic masses: Ca = 40, C = 12, 0 = 16]

(a) Write the equation for the reaction between limestone and hydrochloric acid.

(b) How many moles of hydrochloric acid was spilt?

Q1) A solution made from pure Potassium hydroxide contained 1.85 g of Potassium

hydroxide in exactly 200 cm* of water. Using phenolphthalein indicator, titration of 20.0

cm' of this solution is carried out v/s sulphuric acid. 9.35 cm' of sulphuric acid solution is

required for complete neutralisation. (atomic masses: K= 39, 0 = 16, H = 1]

(a) write the equation for the titration reaction.

(b) calculate the molarity of the Potassium hydroxide solution.

(c) calculate the moles of Potassium hydroxide neutralised.

(d) calculate the moles of sulphuric acid neutralised.

(e) calculate the molarity of the sulphuric acid.