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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 91:

The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces

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A Calcium chloride, carbon (IV) oxide and water
B Calcium chloride, and trioxocarbonate (IV) acid
C Calcium hydroxide, carbon (IV) oxide and chlorine gas
D Calcium hydroxide, carbon (IV) oxide and water
E Calcium metal and water.

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Question 92:

If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula

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A XZ
B XZ₂
C X₂Z
D X₂Z₃
E X₃Z₂

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Question 93:

The following gases are diatomic EXCEPT

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A Fluorine
B Helium
C Hydrogen
D Nitrogen
E Oxygen

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Question 94:

Which of these is NOT a physical property f water?

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A Can be used to dissolve organic substances
B Has a boiling point of 100 ° C
C Has a density of 19cm3 at 40 °C
D Has a freezing point of 0 ° C
E Is neutral to litmus

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Question 95:

During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because ____________

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A Hydrogen ions are in greater concentration than sodium ions.
B Hydrogen is higher than sodium in the electrochemical series.
C Hydrogen is lower than sodium in the electrochemical series.
D Of the nature of the electrodes.
E The concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.

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