Q1) A square is a rhombus because its sides are of equal length and there are 2 pairs of parallel lines. However, Square always has 4 90-degree angled corners but Rhombus doesn't need to have 90-degree angle.
Q4) Squares have two pairs of parallel lines but they have 90-degree angled corners. Parellelogram do not always have 90-degree angled corners.
Q5) Quadrilateral BFDE is a rhombus because lines BE and FD are parallel to each other and also equal in length. Lines BF and ED are also parallel to each other and equal in length. Therefore, BFDE is a parellalogram.