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RPF Constable CBT 1
IMPORTANT
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Tooth decay starts when the pH of the mouth is _____.

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Important Questions on Chemistry

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RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 124
The pH of the solutions are given. Which of the solutions has the highest concentration of hydrogen ions?
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RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 125
If the pH value of a salt is 14, then it is a salt of _____.
HARD
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 126
How many moles of sulphuric acid are present in 25 gms? 
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RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 127
Baking powder is a mixture of _____ and _____ .
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RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 128
The correct formula of calcium hydroxide is _____.
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RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 129
The chemical formula of sodium carbonate is _____.
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RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 130
Which of the following compounds does not possess water of crystallisation?
EASY
RPF Constable CBT 1
IMPORTANT
Railway General Awareness Book>Chapter 49 - Chemistry>Practice Exercise>Q 131
_____ are comparatively poor conductors of heat.