IGCSE Chemistry: Specimen Questions with Answers 180 - 182 of 240
Question 180
Statement True-False▾
elements neither gain nor lose electrons.
Choices
Choice (4) | |
---|---|
a. | True |
b. | False |
c. | None of the above |
d. | Question does not provide sufficient data or is vague |
Answer
a.Explanation
Group elements contain electrons in their valence shell. Hence they neither gain nor lose electrons while forming compounds. Instead, they share electrons.
Question 181
Question MCQ▾
Which columns describe the hydrocarbons ethane and ethene?
Choices
Choice (4) | |
---|---|
a. | 1 (ethane) and 2 (ethene) |
b. | 1 (ethane) and 4 (ethene) |
c. | 2 (ethene) and 3 (ethane) |
d. | 3 (ethane) and 4 (ethene) |
Answer
a.Explanation
Correct option is A because physical state of ethane is gas and when it comes in contact with oxygen then it would burn but there is no reaction when it react with aqueous bromine. Ethane physical state is gas it also burn when it comes in contact with oxygen but it would turn transparent when it react with aqueous bromine as shown in figure.
Question 182
Write in Short Short Answer▾
Impure water needs to be treated if it is to be used in the home.
Complete the diagram below to show the electron arrangement in a water molecule.
EditExplanation
As shown in the figure.
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