PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

Consider a certain reaction \[\ce{A -> Products}\] with k = 2.0 × 10⁻² s⁻¹. Calculate the concentration of A remaining after 100 s if the initial concentration of A is 1.0 mol L⁻¹.

The decomposition of hydrocarbon follows the equation k = `(4.5 xx 10^11 s^-1) e^(-28000 K//T)`

Calculate E_a.

The decomposition of A into product has value of k as 4.5 × 10³ s⁻¹ at 10°C and energy of activation 60 kJ mol⁻¹. At what temperature would k be 1.5 × 10⁴ s⁻¹?

The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.

What role does adsorption play in heterogeneous catalysis?

Give four examples of heterogeneous catalysis.

Out of C and CO, which is a better reducing agent at 673 K?

Giving examples, differentiate between ‘roasting’ and ‘calcination’.

Why copper matte is put in silica lined converter?

Out of C and CO, which is a better reducing agent for ZnO?

Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.

Compare the chemistry of the actinoids with that of lanthanoids with reference to electronic configuration

Compare the chemistry of the actinoids with that of lanthanoids with reference to oxidation states

Compare the chemistry of the actinoids with that of lanthanoids with reference to chemical reactivity.

List various types of isomerism possible for coordination compounds, giving an example of each.

Write the free radical mechanism for the polymerisation of ethene.

What is meant by the term ‘broad spectrum antibiotics’? Explain.

Name a substance which can be used as an antiseptic as well as disinfectant.

What are the main constituents of dettol?