4. Define a base.
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1.
the lowest part of something, especially the part on which it stands or at which it is fixed or connected to something
किसी वस्तु आदि का आधार, नींव; पेंदा, तल
2.
an idea, fact, etc. from which something develops or is made
मूल विचार, पदार्थ, तथ्य आदि
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Answer:
Bases are bitter chemical substances which change red litmus to blue.
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