11.

When a bottle of dry ammonia and a dry hydrogen chloride are connected through a long tube and stoppers at both ends of the tube are opened simultaneously. The white ammonium chloride ring first formed will be:

• at the centre of the tube

• near the hydrogen chloride bottle

• near the ammonia bottle

• throughout the length of the tube

Fear or excitement, generally cause one to breathe rapidly and it results in the decrease of concentration of CO₂ in blood. In what way it will change pH of blood?

• pH will increase

• pH will decrease

• No change

• pH will be 7

Using MO theory, predict which of the following species has the shortest bond length?

• ${\mathrm{O}}_2^{2+}$

• ${\mathrm{O}}_2^{+}$

• ${\mathrm{O}}_2^{-}$

• ${\mathrm{O}}_2^{2-}$

Nitrogen (N₂) is in equilibrium state at T = 421K. The value of most probable speed Vmp is:

• 400 m/s

• 421 m/s

• 500 m/s

• 600 m/s

Hydrogen peroxide when added to a solution of potassium permangnate acidified with sulphuric acid:

• Acts as an oxidising agent

• Acts as a reducing agent

• Forms water only

• Forms water only

On dissolving moderate amount of sodium metal in liquid NH, at low temperature, which one the following does not occur?

• Na⁺ ions are formed in the solution

• Blue coloured solution is obtained

• Liquid NH₃ becomes good conductor of electricity.

• Liquid ammonia remains diamagnetic

Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenyl amine as indicator. The number of moles of Mohr's Salt required per mole of dichromate is:

• 3

• 4

• 5

• 6

When MnO₂ is fused with KOH, a colouredcompound is formed. The product and its colour is:

• K₂MnO₄ , purple colour

• Mn₂O₃ , brown

• Mn₂O₄ , black

• KaMnO₄ , purple

Which of the following statements is incorrect regarding graphite?

• The structure of graphite· is two dimensional sheet like consisting of a number of benzene rings

• The structure of graphite is more compact than that of diamond.

• Graphite fibres embedded in plastic material form high strength, light weight composites

• Graphite cleaves easily between the layers

Which of the following statement(s) is /are false about cyclopropane -1, 2 dicarboxylic acid?

• It has two geometrical isomers

• It has three stereoisomers

• All the stereo isomers are optically active

• Only tran isomers show enantio- isomorphism