Which metal has the highest density?

A. Gold

B. Platinum

C. Iron

D. None of these

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In which cell organelle do photo and thermochemical reactions occur in different sites?

A. Ribosomes

B. Golgi apparatus

C. Chloroplast

D. Mitochondria

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What is the second most abundant element in the earth‟s crust?

A. Silicon

B. Aluminium

C. Sodium

D. Magnesium

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