A + B $\rightleftharpoons$ C + D. If initially the concentration of A and B are both equal but at equilibrium, concentration of D will be twice of that of A, then what will be the equilibrium constant of reaction?

• 4/9

• 9/4

• 1/9

• 4

The geometry of Ni(CO)₄ and Ni(PPh₃)₂Cl₂ are:

• both square planar

• tetrahedral and square planar respectively

• both tetrahedral

• square planar and tetrahedral respectively

Which of the following is not a property of liquid state ?

• Intermolecular force of attraction in a liquid is quite large

• All liquids accompanied by cooling on evaporation

• Lower the boiling point of a liquid, greater is its vapour pressure at room temperature

• A liquid boils at high temperature at the top of a mountain than at the sea level

4.

If for a sucrose solution, elevation in boiling point is 0.1°C, then what will be the boiling point of NaCl solution for same molal concentration ?

• 0.1$°$C

• 0.2$°$C

• 0.08$°$C

• 0.01$°$C

Which of the following have maximum number of unpaired electrons ?

• Fe³⁺

• Fe²⁺

• Co²⁺

• Co³⁺

What will be the order of I^st ionisation energy?

• Li > Na > K

• K > Li > Na

• Na > Li > K

• Li > K > Na

Given pH of a solutionA is 3 and it is mixed with another solution B having pH 2. If both mixed, then resultant pH of the solution will be :

• 3 : 2

• 1 : 9 

• 3 : 4

• 3 : 5

With which of the given pairs CO₂ resembles ?

• HgCl₂, C₂H₂

• HgCl₂, SnCl₄

• C₂H₂, NO₂

• N₂O, NO₂

If magnetic quantum number of a given atom represented by -3, then what will be its principal quantum number ?

• 2

• 3

• 4

• 5

Which of the following have highest electron affinity?

• F

• Cl

• N

• O