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Test # 198 [15-Jan-2017]


1.
Select the one which is not a mixture

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151 [29-Nov-2016] 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 [14-Dec-2016] 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 [29-Dec-2016] 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 [13-Jan-2017] 197 198 199 200

Element : oxygen
Symbol : o
Atomic no. : 8
Melting Point (deg c) : -218.79
Boiling Point (deg c) : -182.95
Discoverer : priestley/scheele (1774)      .. More >>

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