Among the following, which are ambidentate ligands?
(i) SCN⁻
(ii) $$NO^-_3$$
(iii) $$NO^-_2$$
(iv) $$C_2O^{2-}_4$$

1) (i) and (iii)
2) (i) and (iv)
3) (ii) and (iii)
4) (ii) and (iv)

In context with the industrial preparation of hydrogen from water gas (CO +H₂), which of the following is the correct statement?

1) H₂ is removed through occlusion with Pd
2) CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ in alkali
3) CO and H₂ are fractionally separated using differences in their densities
4) CO is removed by absorption in aqueous Cu₂C₁₂ solution

 Half life of radium is 1580 years. Its average life will be

1) 1.832×10³ yrs
2) 2.25×10³ yrs
3) 2.275×10³ yrs
4) 8.825×10² yrs

The specific conductance of saturated solution of CaF₂ is 3.86 × 10⁻⁵ ohm cm⁻¹ and that of water used for solution is 0.15×10⁻⁵. The specific conductance of CaF₂ alone is:

1) 3.71 × 10⁻⁵
2) 4.01 × 10⁻⁵
3) 3.7 × 10⁻⁴
4) 3.86 × 10⁻⁴

If each one of the above ionic species is in turn kept in a magnetic field, which one will get attracted ?

1) $$Co^{+2}$$ 
2) $$Mn^{+7}$$
3) $$Sc^{+3}$$
4) $$Ti^{+4}$$

On reaction of chlorobenzene with acetyl chloride in presence of anhydrous AICl₃, the major product formed is:

Acetone and acetophenone can be distinguished by :

 1) Tollens test
2) CNP TEST
3) Schiff's regent
4) saturated solution of NaHSO₃.

0.56 g of limestone was treated with oxalic acid to give CaC_2?O₄?. The precipitate decolorised 45 mL of 0.2 N KMnO₄? in acid solution. Calculate the % of CaO in limestone.

1) 15

2) 20

3) 34 

4) 45

The compound if contains an even number 'n' of chiral carbons, but the molecule can be divided into two equal and si,ilar halves , then how many optical active form it will have :

1) 2ⁿ
2) 2⁽ⁿ⁻¹⁾
3) 2^(n−1)/2
4) 2⁽ⁿ⁻¹⁾−2^(n−1)/2

The ease of nitration of the following three hydrocarbons follows the order.

1) II =III =I
2) III > II > I
3) II > III > I
4) I = III > II