121. Which of the following is a natural polymer?
122. Plastic is a type of
123. Polythene is polymer of
124. Glycol is used to manufacture which of the following ?
125. Silk fibre chemically is :
126. What is the chemical symbol of mercury?
127. Which of the following is a monoatomic gas?
128. The purest form of water in nature is
129. In drinking water supply, which of the following treatments is not involved
130. The two metal ions that cause hardness to water are:
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