Ionisation energy in group 1A varies in the decreasing order as 

(a) Li > Na > K > Cs 

(b) Na > Li > K >Cs 

(c) Li > Cs > K > Na 

(d) K > Cs > Na > Li

During the adiabatic expansion of 2 moles of an ideal gas, the increase in internal energy was found to be equal to (–200 J). The work done by the gas during the process will be equal to 

(A) 0 

(B) 400 J 

(C) –200 J 

(D) 200 J

Which of the following effects of –NO₂ group operates on –NH₂ group in this molecule?

(A) Only –I effect 

(B) Only +M effect 

(C) Only –M effect 

(D) Both –I and –M effect

Aldol condensation reaction is not given by 

(a) C₆H₅CH₂CHO 

(b) C₆H₅CHO 

(c) CH₃CHO 

(d) CH₃COCH₃ 

The Markonvikov’s rule is best applicable to the reaction

(A) C₂H₄ + HCl 

(B) C₃H₆ + Br₂ 

(C) C₃H₆ + HBr 

(D) C₃H₈ + Cl₂

Which one is least reactive in a nucleophilic substitution reaction?

(a) CH₃CH₂CI 

(b) CH₂ =CHCH₂CI 

(c)CH₂=CHCI 

(d)(CH₃)₃CCI

Which compound will be most reactive for electrophilic addition reaction? 

(A) CH₃ – CH = CH – CH₃ 

(B) CH₃ – C C≡ CH₃ 

(C) CH₃–CH = CHCOOCH₃

A train travels east towards Hubli at 80 km/hr. A man on the train runs from the front of the train toward the rear of the train at 10 km/hr with respect to train. As he runs, he carries a plate of fruit with him. He notices a giant spider on the plate and throws the plate away from him (toward the rear of the train) at 20 km/hr with respect to him. Just after that instant, the startled spider jumps towards the man at 5 km/hr with respect to plate. The instant after the spider jumps toward the man, how fast is the spider approaching Hubli?

(A) 45km/hr 

(B) 115 km/hr 

(C) 55 km/hr 

(D) 95 km/hr

Petroleum refining involves 

(A) Vaccum distillation 

(B) Fractional distillation 

(C) Steam distillation 

(D) Simple distillation

The increasing order of the first ionization enthalpies of the elements B, P, S and F is: 

(A) B < P < S < F 

(B) B < S < P < F 

(C) F < S < P < B 

(D) P < S < B < F