Which of the following shell, form an outer octahedral complex?

• d⁴

• d⁸

• d⁶

• None of these

C (s) + O₂ (g) → CO₂ (g); $∆$H = -94kcal

2CO (g) + O₂ (g) → 2CO₂ (g); $∆$H = -135 kcal.

The heat of formation of CO (g) is

• -26.4 kcal

• 41.2 kcal

• 26.4 kcal

• 229.2 kcal

Conjugate acid of HF${}_2^{-}$ is

• H⁺

• HF

• F${}_2^{-}$

• H₂F₂

14.

An electron from one Bohr stationary orbit can go to next higher orbit

• by emission of electromagnetic radiation

• by absorption of any electromagnetic radiation

• by absorption of electromagnetic radiation of particular frequency

• without emission or absorption of electromagnetic radiation

Valence bond theory of metallic bond was given by

• Dalton

• Drudel

• Fajan

• Pauling 

Splitting of spectrum lines in magnetic field is

• Stark effect

• Raman effect

• Zeeman effect

• Rutherford effect

Isoelectronic pair among the following is

• Ca and K

• Ar and Ca²⁺

• K and Ca²⁺

• Ar and K

For the following reaction in gaseous phase

CO (g) + $\frac{1}{2}$O₂ (g) → CO₂ (g) K_p/ K_c is

• (RT)^1/2

• (RT)^-1/2

• (RT)

• (RT)^-1

On adding 1 g arsenic to 80 g benzene, the freezing' point of benzene is lowered by 0.19°C. The formula of arsenic is

• As

• As₂

• As₃

• As₄

The standard emf of a cell, involving one electron change is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is (F = 96500 C mol^-1)

• 1.0 × 10¹

• 1.0 × 10⁵

• 1.0 × 10¹⁰

• 1.0 × 10³⁰