49th Parallel is the boundary line between which two countries?
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Which gas contributes most to the Greenhouse effect?
Which of the following statement is CORRECT?
The passage of an electric current through a conducting liquid causes ___________.
Glass is also called ________.
Name the acid present in lemon.
In the following question, four words have been given out of which one word is incorrectly spelt. Select the incorrectly spelt word.
Which of the following is not correctly matched?