The nucleus of an element contains 9 protons. its valency, The nucleus of a...

The nucleus of an element contains 9 protons. Its valency would be : (1) 1        (2) 3        (3) 2        (4) 5 Ans: 1

The frequency corresponding to transition & hydrogen atom, The frequency co...

The frequency corresponding to transition n= 2   to n =1   in hydrogen atom is: (1) 15.66 x 10 10 Hz                           (2)  24.66 x 10 14 Hz          (3) 30.5

Explain in detail about the allotropy, Explain in detail about the Allotrop...

Explain in detail about the Allotropy Allotropy refers only to dissimilar forms of an element within the similar phase or state of matter (i.e. different solid, liquid or gas

Define uncertainty, This brings us to one thing that uniformly drives stude...

This brings us to one thing that uniformly drives students crazy. When anything is measured in the lab, you must keep track of how accurately you can measure it. If you measure you

Air and water, state the adverse effect of common air pollution on building...

state the adverse effect of common air pollution on buildings and health

Uses of selenium, Q. Uses of selenium? Uses of selenium include photoco...

Q. Uses of selenium? Uses of selenium include photocopying process of xerography, decobrisation of glasses and as a catalytic agent particularly in the isomerisation of certain

When is fresh produce to harvest, When is fresh produce to harvest? ...

When is fresh produce to harvest? Optimum quality of fruits and vegetables is obtained only when they are harvested at the optimal stage of maturity. A critical time for

Covalent bonding, Give ten Characteristics of convalent bonding

Give ten Characteristics of convalent bonding

Classification of polymers - on the basis of structure, Classification of p...

Classification of polymers - On the basis of structure On the basis of structure of polymers these can be classified as (i) Linear polymers      (ii) Branched chain polym

Ionic bond,