F.Sc Chemistry
Why the polarizibilities of elements mostly increase down the group ?
The polarizabilites of the elements increase down the group. The reason is that number of shell increases and shielding effect also increases. Both these factors decrease the force of attraction between the nucleus and the outermost electron. This increase the polarizabilities. Read More →
Which of the following is about the limiting reactant?
A limited reactant is consumed earlier and so it gives the least number of moles of products. Read More →
What is temperature coefficient of a reaction?
When the temperature of reaction is increased by 10 K, the rate constant of reaction almost doubles. This is called temperature coefficient of reaction. So, when the temperature changes from 298 K to 308 K, then the rate constant doubles. Read More →
Which of the following statements regarding a catalyst is not true?
A catalyst cannot initiate those reactions which are not thermodynamically favourable. Read More →
What are the number of isotopes of Tin?
Tin is one one of the well known elements which has eleven isotopes. Read More →
What will be the graph between pressure and inverse of volume at constant temperature and number of moles?
Pressure and inverse of volume at constant temperature are directly proportional to each other. So they will give a straight line passing through the origin. Read More →
Which of the following is false in the case of gases?
Gases can have an excellent property to mix with each other. This property is due to random motion and collisions. Read More →
Which of the following substances is used as de-colouring agent?
The crystalline substance freshly prepared after filtration have certain colours. These colours can be removed by decolorizing agent like animal charcoal. Read More →
Which of the following substances is not used as drying reagent in a desiccator?
50% KOH is solution of KOH in water. It can not absorb moisture an can not help us to act as a drying agent in a desiccator. Read More →
Which of the following have largest number of molecules?
Calculate the number of moles of each Mass of H2O = 3.6 g Moles of H2O = 3.6g / 18g mole−1 = 0.2 moles Mass of C2H5OH = 4.6 g Moles of C2H5OH = 4.6g / 46g mole−1 = 0.1 moles Mass of CO = 2.8 g Moles of CO = 2.8g / 28g mole−1 = 0.1 moles Mass of N2O5 = 5.4 g Moles of N2O5 = 5.4 g / 108... readmore
