Precipitation takes place when the product of concentration of ions :

1) is less than their solubility product
2) is negligible
3) equals their solubility product
4) exceeds their solubility  product.

Which one of the following on oxidation with alkaline permangante solution yields benzoic acid ? :

1) Isopropyl chloride
2) Benzyl chloride
3) Chlorobenzene
4) Phenol.

In permanganometric titrations, the end point is :

1) yellow colour

2) pink colour

3) red colour 

4) colourless

In which of the following compounds boron atoms are in sp² and sp³ hybridisation states?

1) Borax
2) Diborane
3) Borazole
4) All of the above

The most efficient agent for the absorption of SO₃ is:

 1) 80% H₂S0₄.
2) 98% H₂S0₄.
3) 90% H₂S0₄.
4) 20% H₂S0₄

Which of the following can yield acetylene in one step?

1)  Ethene

2)  Ethylene dichloride

3)  Sodium acetate

4)  Propyne

The alkene that will give the same product with HBr in the absence as well as in the presence of peroxide is?

1) 2−butene
2) 1−butene
3) propene
4) 1−hexene

One mole of the complex compound Co(NH₃)₅Cl₃ gives three moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO₃ solution to yield two moles of AgCl(s). The structure of complex is: 

1) $$[Co(NH_{3})_{4}Cl]Cl_{2}.NH_{3}$$
2) $$[Co(NH_{3})_{5}Cl]Cl_{2}$$
3) $$[Co(NH_{3})_{3}Cl_{3}]2.NH_{3}$$
4) $$[Co(NH_{3})_{4}Cl_{2}]Cl.NH_{3}$$

Identify the element which can have highest oxidation number

 1. C
 2. N
 3. O
 4. Cl

Hydrolysis of benzonitrile by dilute HCl yields

1. aniline 
2. benzoldelyde 
3. benzoic acid 
4. benzaunide