Online CBSE NEET 2017 Solution of Chemistry = 5

These are Online CBSE NEET 2017 Online Solution of Chemistry =5 for preparation.

1. Extraction of gold and silver involes leaching with CN–ion. Silver is later recovered by :-

• distillation
• zone refining
• displacement with Zn
• liquation

2. A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO2 attains its maximum value, will be :- (Given that :SrCO₃ (s)<=> SrO(s) CO₂ (g), Kp = 1.6 atm)

• 10 litre
• 4 litre
• 2 litre
• 5 litre

3. Pick out the correct statement with respect to [Mn(CN)₆]^3–:-

• It is sp³d² hybridised and tetrahedral
• It is d²sp³ hybridised and octahedral
• It is dsp² hybridised and square planar
• It is sp³d² hybridised and octahedral

4. The reason for greater range of oxidation states in actinoids is attributed to :-

• actinoid contraction
• 5f, 6d and 7s levels having comparable energies
• 4f and 5d levels being close in energies
• the redioactive nature of actinoids

5. Which of the following statements is not correct :-

• Ovalbumin is a simple food reserve in egg-white
• Blood proteins thrombin and fibrinogen are involved in blood clotting
• Denaturation makes the proteins more active
• Insulin maintanis sugar level in the blodd of a human body