Give an example of a salt which gives an aqueous solution of pH less than 7.
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Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?
Pyrolusite is an ore/mineral of ___________.
Haematite is an ore/mineral of
Pentlandite is an ore/mineral of _______.
Which of the following compounds is the strongest acid?
Which was not produced by volcanic outgassing?
Which of the following has pH value 7?
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