SO₂ is reduced.

Green Cr₂(SO₄)₃ is formed.

The solution turns blue.

The solution is decolourised.

[Fe(CO)₄]^2$$-$$

[Mn(CO)₆]⁺

Ni(CO)₄

[Co(CO)₄]^$$-$$

the eclipsed conformation of ethane is more stable than staggered conformation even through the eclipsed conformation has torsional strain

the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain

the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

the eclipsed conformation of ethane is more stable than stggered conformation, because eclipsed conformation has no torsional strain.

I < Br < Cl < F (increasing electron gain enthalpy)

Li < Na < K < Rb (increasing metallic radius)

Al³⁺ < Mg²⁺ < Na⁺ < F^$$-$$ (increasing ionic size)

B < C < N < O (increasing first ionisation enthalpy)