1. The two electrodes of Pt fitted in a conductance cell are 1.5 cm apart while the cross - sectional area of each
electrode is 0.75 cm2. What is cell constant in cm^-1?
a) 0.2 b) 0.5 c) 2.0 d) 1.125
2. The rate of second order reaction
is 3 × 10–5 mol L–1 5–1. What is the rate consant K, when the initial concentration
is 0.2 mol L^–1
a) 1.5 × 10–4 b) 7.5 × 10–4 c) 7.5 × 10–3 d) 1.5 × 10–3
3. The amount of electricity required to deposite 1 mole of Al from a solution of AlCl3 will b
a) 0.33 F (B) F(C) 3F (D) 1 Ampere
4. The no of chiral carbon in Lactice aid is.
a) 4 b) 5 c) 1 d) 3
5. Which can readily undergo dehydration.
(A) CH3OH (B) C6H5OH (C) (CH3)3COH (D) CH3COOH
6. The reduction of Benzoyl chloride with Pd and BoSO4 produces
a) Benzoyl chloride b) Benzal chloride c) Benzoic Acid d) None
7. Which the following is most acidic
a) H2O b) CH3OH c) C2H5OH d) CH3(CH2)2CH2OH
8. The number of isomers of the compound with moleculars formula C2BrClFI is
(A) 3 (B) 4 (C) 5 (D) 6
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2 Answers
394) 1 chiral carbon, leading to two optical isomers.
6) None, it leads to benzaldehyde. This is Rosenmund Reduction.
7) Methanol is strongest acid, it is an exception. CH3O- anion is somewhat stable due to accommodation of negative charge over surface area of CH3. Hence its conjugate acid is stronger than the rest of the alcohols given.
5) Tert-butyl alcohol undergoes dehydration readily as tertiary carbocation is most stable carbocation.
3) The balanced electrode reaction for this is -:
Al3+ + 3- -----> Al
The number of electrons involved in this reduction gives the number of Faradays of electricity. Here for one mole of Al to be deposited, 3 Faradays of electricity are required. Hence (C).
1) Cell constant G" = l/A = 1.5/0.75 = 2 cm-1
29Ans 1 Cell constant = length/Area = 2cm-1 C
Ans 2 B Rate = K [0.2]2
Ans 3 it will be 3F ..since charge on Al is +3
Ans 5 C
Ans 7 B
Ans 8 D Six structure are possible..