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प्रश्न
Tick (√) the correct answer.
Which of the following exhibit variable valency ?
विकल्प
calcium
copper
carbon
chlorine
MCQ
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उत्तर
copper
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
Tick (√) the correct answer.
Which of the following exhibit variable valency ?
calcium
copper
carbon
chlorine
copper