5.
Statement A : Sulphur is a divalent element.
Statement B: Chlorine is a monovalent element.
Statement C: Aluminium is a trivalent element.
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The sign of power depends on the direction in which a light ray is deviated by the lens. The power could be positive or negative. If a lens deviates a ray towards its centre (converges), the power is positive and if it deviates the ray away from its centre (diverges), the power is negative.
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Answer:
statement A is true
statement B is true
statement C is true
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