Chemistry Past Questions, Answers & Explanations For JAMB, WAEC, NECO & Post UTME - Chemistry

Chemistry Questions

Question 171:

JAMB 1980

Chlorine, bromine and iodine resemble each other in that all?

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A Dissolve in alkalis
B React violently with hydrogen without heating
C Displace each other from solutions of their salts
D Are gases
E Are liquids

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Question 172:

JAMB 1980

Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?

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A When exposed to air, it slowy changes to liquid
B Its solution in water conducts electricity
C Its solution in water, on evaporationm gives a white solid
D Its solution in water liberates hydroge when in contact with aluminium metal
E Its oxide, when stronlgy heated, regenerates the elements X

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Question 173:

JAMB 1980

Which ONE of the following statements is true?

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A All alkali metals salts dissolves with dissociation in water
B Most ionic substances are easily vaporized
C Ionic substances exist only as liquid
D Non-ionic substances are good electrolytes
E Nitrogen exists in a trivalent state in ammonium salts

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Question 174:

JAMB 1980

When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?

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A Substitution
B Addition
C Polymerization
D Hydrolysis
E Reduction

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Question 175:

JAMB 1980

20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?

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A Acidic with a molarity of 0.50 M H2SO4
B Acidic with a molarity of 0.25 H2SO4
C Neutral
D Alkaline with a molarity of 0.25 M NaOH
E Alkaline with a molarity of 0.50 M NaOH

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