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Un problema al día: se otorgan 6 unidades de riqueza a quienes respondan correctamente, y 2 unidades de riqueza a los participantes; 11 de septiembre

2016-09-11View Original

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Pregunta de opción única: Una lámina de aluminio expuesta al aire puede reaccionar con ( ). A. Agua ; B. Nitrato concentrado y frío ; C. Ácido sulfúrico concentrado y frío ; D. Solución de NH4Cl. Respuesta: B

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