'Triclosan', considered harmful when exposed to high levels for a long time, is most likely present in which of the following?

Which one of the following is used in preparing a natural mosquito repellent?

Which one of the following is not a pigment?

Which one among the following is commonly used as an 'anti-skinning agent' in paints ?

Which one among the following is used in bleaching of paper?

Which among the following are essential constituents of Portland cement ?