elements, compounds and mixtures

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How many different types of atom are present in a compound?

सही उत्तर का चयन करें  

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114183
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114193
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114203
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120
none
114220
0
120
none
114236
0
120
none
114247
0
120
none
114265
0
120
none
114275
0
120
none
114288
0
120
none
114296
0
120
none
114306
0
120
none
114156
0
120
none
114164
0
120
none
114168
0
120
none