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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

45 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

45 questions
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Question 1 of 5 45 total questions
Question 21
jamb 1984
Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?
A1 and 2
B2 and 3
C3 and 4
D1, 2, and 3
E2, 3, and 5
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Question 22
jamb 1984

A molar solution of caustic soda is prepared by dissolving

A40 g NaOH in 100 g of water
B40 g NaOH in 1000 g of water
C20 g NaOH in 500 of solution
D20 g NaOH in 1000 g of solution
E2o g NaOH in 80 g of solution
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Question 23
jamb 1984

For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)

A2.24 dm 3
B2.24 cm3
C1. 123
D1. 12dm 3
E4. 48 dm 3
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Question 24
jamb 1984

20 cm\(^3\) of hydrogen gas are sparked with 20cm\(^3\) of oxygen gas in an endimoeter at 373k (100\(^0\)C) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 oC) and passed over calcium chloride. The volume of the residual gas is

A40 cm 3
B20 cm 3
C30 cm 3
D10cm 3
E5cm 3
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Question 25
jamb 1984
Sodium chloride may be obtained from brine by
Atitration
Bdecantation
Cdistillation
Devaporation
Esublimation
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