The reaction of 1-hexene with HBr in presence of peroxide yields 1-bromo cyclohexane. The mechanism of the reaction involves :

1 attack on alkene by a Br+ ion
2) attack on alkene by a bromide ion
3) attack on alkene by a bromine free radical
4) None of these

Given that Zn + ½ O₂ --> ZnO + 35.28 kj HgO --> Hg + ½ O₂ - 9.11 kj so the heat of reaction Zn + HgO --> ZnO + Hg is
 1. 26.17 kj
 2. 44.39 kj
 3. -44.39 kj
 4. 2.617 kj.

The atoms/ion listed in correct order of increasing size are

1)  Be²⁺, Mg²⁺, Na⁺

2)  Na⁺, Cl ^-, K⁺

3)  Al, Na, S

4)  Na, Si, H

Gas B is passed into aqueous solution of C to form A

FeS + HCl -> A + B(g)

Select correct statements based on the above facts

1) Colour of C changes from yellow to very light green
2) Gas B turns lead acetate paper black
3) A form deep blue colour with K₃[Fe(CN)₆]
4) All the above facts are true

A catalyst in the finely divided state is more efficient because in this state

1)  it can react with one of the reactant more efficiently

2)  it has larger activation energy

3)  it has large surface area

4)  all of the above

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

1) N-Phenylhydroxylamine
2) Nitrosobenzene
3) Aniline
4) pHydroxyaniline

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K. If pressure of the system is increased to 2 atm while keeping temperature constant, which of the following would be the correct observation?

1) The liquid phase disappears completely
2) The amount of ice decreases
3) The solid phase (ice) disappears completely
4) Volume of the system increases

The highest ionization potential in a period is shown by

1)  halogens

2)  noble gases

3)  alkaline earth metals

4)  alkali metals

Which of the following compounds on reaction with C₂H₅MgBr and water will form 2 - methyl - 2 - butanol

1) CH₃COCH₃
2) CH₃CH₂CHO
3) CH₃COOH₃
4) CH₃CH₂OH

Which of the following are isoelectronic and isostructural?

1) $$NO^{-}_{3}$$, $$CO^{2-}_{3}$$
2) $$SO_{3}$$ , $$NO^{-}_{3}$$
3) $$CO^{-}_{3}$$ , $$CO^{2-}_{3}$$
4) $$CO^{2-}_{3}$$ , $$SO_{3}$$