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The cyclic cations having the same number of hyperconjugation are : A. [Diagram: A cyclic cation with a positive charge on a tertiary carbon, adjacent to a methyl group on a cyclohexane ring.] B. [Diagram: A cyclic cation with a positive charge on a tertiary carbon, adjacent to two methyl groups on a cyclohexane ring.] C. [Diagram: A cyclic cation with a positive charge on a tertiary carbon, adjacent to a methyl group on a cyclohexane ring, identical to A.] D. [Diagram: A cyclic cation with a positive charge on a secondary carbon, with a methyl group and another carbon in the ring.] Choose the correct answer from the options given below :

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Given below are two statements: Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode. Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens. In the light of the above statements, choose the correct answer from the options given below

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A metal wire of uniform mass density having length L and mass M is bent to form a semicircular arc and a particle of mass m is placed at the centre of the arc. The gravitational force on the particle by the wire is: [Diagram: Semicircular arc with mass m at center]

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