Among the ligands NH₃, en, CN^– and CO the correct order of their increasing field strength, is:  
 

The expression for the solubility product of Ag₂CO₃ will be

1) K_sp = s²
2) K_sp = 4s³
3) K_sp = 27s⁴
4) K_sp = s

Silk and woolen clothes are often damaged by

1) Flies

2) Insects

3) Bacteria

4) Animals

E0(Ni₂₊/Ni)=−0.25volt,  E0(Au³⁺/Au)=1.50volt . The standard emf of the voltaic cell. Ni(s)|Ni²⁺(aq)(1.0M)|| Au³⁺(aq)(1.0M)|Au(s)Ni(s)|Ni(aq)2+(1.0M)||Au(aq)³⁺(1.0M)|Au(s) is:

1) 1.25  volt
2) - 1.75 volt
3) 1.75 volt
4) 4.0 volt

Which of the following forms cationic micelles above certain concentrations?

1) Sodium dodecyl sulphate
2) Urea
3) Sodium acetate
4) Cetyl trimethyl ammonium bromide

A solution has positively charged colloidal particles. Which of the following solutions is required in lowest concentration for coagulation?

1)  Na₂SO₄

2)  ZnCl₂

3)  K₄[Fe(CN]₆

4)  NaCl

 Fluorobenzene (C₆H₅F) can be synthesized in the laboratory  

1)  by direct fluorination of benzene with F2  gas  
2)  by reacting bromobenzene with NaF solution  
3)  by heating phenol with HF and KF
4)  from aniline by diazotisation followed by heating the diazonium salt with HBF₄
   

A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is

1) Pb²⁺
2) Hg²⁺
3) Cu²⁺
4) Co²⁺

An aqueous solution containing V^x+ ion has magnetic moment equal to √ 15BM. Therefore, the x is:

1) 5
2) 4
3) 3
4) 2

Select the incorrect statement.

1) Cl₂O₆ is diamagnetic in solid state.

2) ClO3 is paramagnetic and exists in liquid state.

3) Cl₂O₆ is the anhydride of HClO₃.

4) ClO₃ for forms dimer due to unpaired electron.