States of Matter — Chemistry STD 11 Science — Question

Dissolve 4 g cobalt chloride in 40 mL water. It forms a reddish pink solution. Add 60 mL concentrated HCl to this. It will turn blue. Take 5 mL of this solution in a test tube and place it in a beaker containing ice water mixture. The colour of solution will become pink. Place the same test tube in a beaker containing water at 90 °C. The colour of the solution turns blue.

A 20 L container holds 0.650 mol of He gas at 37 °C at a pressure of 628.3 bar. What will be new pressure inside the container if the volume is reduced to 12 L. The temperature is increased to 177 °C and 1.25 mol of additional He gas was added to it?

On the basis of even-odd of protons and neutrons, what type of nuclides are most stable ?

Explain the relation between nuclear mass and energy? Also give the energy released in the conversion of one atomic mass unit into energy.

Give the graphical representation of Gay-Lussac’s law.

Mention the properties of lithium that differ from rest of the alkali group metals.

Draw the flowchart showing the manufacture of NH3 by Haber process.

Write a note on occurrence of hydrogen.

What are the important points considered while selecting the most stable resonance structure if there are several contributing/resonance structures for a compound?