Online CBSE NEET 2017 Online Solution of Chemistry-=3

These are MCQs of CBSE NEET 2017 with Solutions of chemistry = 3

1. Which one is the wrong statement ?

• The uncertainty principle is ΔE × Δt >= h/4π
• Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry an d mo re b alan ced arrangement
• The energy of 2s orbital is less than the energy of 2p orbital in case of Hydrogen like atoms
• de-Broglies's wavelength is given by λ = h/mv where m = mass of the particle, v = group velocity of the particle

2. Which is the incorrect statement ?

• Density decreases in case of crystals with Schottky's defect
• NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.
• Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal
• FeO_0.98 has non stoichiometric metal deficiency defect

3. The species, having bond angles of 120° is :-

• CIF₃
• NCl₃
• BCl₃
• PH₃

4. For a given reaction, ΔH = 35.5 kJ mol^–1 and ΔS = 83.6 JK^–1 mol^–1. The reaction is spontaneous at : (Assume that ΔH and ΔS do not vary with tempearature)

• T > 425 K
• All temperatures
• T > 298 K
• T < 425 K

5. Which of the following is a sink for CO ?

• Micro organism present in the soil
• Oceans
• Plants
• Haemoglobin

6. If molality of the dilute solutions is doubled, the value of molal depression constant (Kf) will be :-

• halved
• tripled
• unchanged
• doubled

7. Which o f th e fo llowing is d epen dent on temperature?

• Molarity
• Mole fraction
• Weight percentage
• Molality

8. Which one of the following statements is not correct?

• The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium
• Enzymes catalyse mainly bio-chemical reactions
• Coenzymes increase the catalytic activity of enzyme
• Catalyst does not initiate any reaction

9. Identify A and predict the type of reaction

10. The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexs : CoCl₃.6NH₃ , CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is :-

• 3 AgCl, 1 AgCl, 2 AgCl
• 3 AgCl, 2 AgCl, 1 AgCl
• 2 AgCl, 3 AgCl, 1 AgCl
• 1 AgCl, 3 AgCl, 2 AgCl