IIT-JEE-Chemistry-Screening–2000

26. Which one of the following will most readily be dehydrated in acidic condition:

       

27. The compressibility of a gas is less than unity at STP. Therefore : 
(A) Vm > 22.4 litres                            (B) Vm < 22.4 litres 
(C) Vm = 22.4 litres                            (D) Vm = 44.8 litres 

28. The rate constant for the reaction, 2N2O5 ® 4NO2 + O2 is 3.0 × 10–5 s–1. If the rate is 2.40 × 10–5 mol L–1 s–1, then the concentration of N2O5 (in mol L–1) is : 
(A) 1.4                                            (B) 1.2 
(C) 0.04                                          (D) 0.8 

29. At 100oC and 1 am if the density of the liquid water is 1.0g cm–3 and that of water vapour is 0.0006 g cm–3, then the volume occupied by water molecules in1 litre of steam at this temperature is: 
(A) 6 cm3                                        (B) 60 cm3 
(C) 0.6 cm3                                     (D) 0.06 cm3 

30. When two reactants, A and B are mixed to give products C and D, the reaction quotient, Q, at the initial stages of the reaction : 
(A) is zero                                     (B) decreases with time 
(C) is independent of time                (D) increases with time 

The questions below consist of an ‘Assertion’ in column I and the ‘Reason’ in column 2. Use of the following key to choose the appropriate answer. 
(A) If both assertion and reason are CORRECT, and reason is the CORRECT explanation of the assertion. 
(B) If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion. 
(C) If assertion is CORRECT, but reason is INCORRECT. 
(D) If assertion is INCORRECT, but reason is CORRECT.

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