Which one of the following planes contains the z-axis?

Which one of the following is the plane containing the line (x-2)/2=(y-3)/3=(z-4)/5 and parallel to z-axis?

Which one of the following planes is normal to the plane 3x+y+z=5 ?

Which one of the following planes is normal to the plane 3x+y+z=5 ?

Which one of the following points lies on the plane 2x+3y-6z=21 ?

Which of the following compounds does not contain the plane of symmetry?

Which of the following combinations is not allowed (assume z - axis as internuclear axis) ?