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Chemical combination - Jamb Chemistry Past Questions and Answers

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Jamb Chemistry Past Questions

Jamb Past Questions and Answers on Chemical combination

Question 91:


Use the table above to answer this question .The least reactive element is

A. W
B. X
C. Y
D. Z


Question 92:


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


Question 93:


The partial pressure of oxygen in a sample of air is 452 mm Hg and the total pressure is 780 mm Hg. What is the mole fraction of oxygen?

A. 0.203
B. 0.579
C. 2.030
D. 5.790


Question 94:


25cm3 of a gas X contains Z molecules at 15oC and 75 mmHg. How many molecules will 25 cm3 of another gas Y contain at the same temperature and pressure?

A. 2 Y
B. 2 Z
C. Z
D. Y


Question 95:


What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
[H = 1, O = 16]

A. 36.0g
B. 8.0g
C. 72.0g
D. 16.0g






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