Explain how a dirty blanket becomes dust free if it is jerked once or twice ?

Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number?

How many words can be formed using the letter A thrice. the letter B twice and the letter C once ?

Explain how does resistivity of a conductor depend upon number density n of free electron relaxation time tau ?

Explain how the resistivity of a conductor depends upon number density 'n' of free electrons?

A train time table must be compiled for various days of the week, so that two trains twice a day depart for three days, one train daily for two days, and three trains once a day for two days. How many different time tables can be compiled? a. 140 b. 210 c. 133 d. 72

Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. How many steps involved in mechanism of catalysis ?

How many time does the current flowing in an electric bulb becomes zero in one second? Explain.