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How many moles HCL will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

A. 14
B. 12
C. 11
D. 10

2000
90
50 cm3 of carbon (II) oxide was exploded with 150 cm3 of air containing 20% oxygen by volume. Which of the reactants was in excess?
A. Carbon (II) oxide
B. Carbon (IV) oxide
C. Oxygen
D. Nitrogen

Which of the following compounds is composed of Al, Si, O and H?

A. Epsom salt
B. Limestone
C. Clay
D. Urea

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