Assertion (A): One atomic mass unit is defined as one-twelfth of the mass of one carbon-12 atom. Reason (R): Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as the standard. (i) Both A and R are true and R is the correct explanation of A. (ii) Both A and R are true but R is not the correct explanation of A. (iii) A is true but R is false. (iv) Both A and R are false.

Chemistry | Class 11 | Exercise 1 | NCERT | Some Basic Concepts of Chemistry

Assertion (A): One atomic mass unit is defined as one-twelfth of the mass of one carbon-12 atom. Reason (R): Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as the standard. (i) Both A and R are true and R is the correct explanation of A. (ii) Both A and R are true but R is not the correct explanation of A. (iii) A is true but R is false. (iv) Both A and R are false.

Correct Answer: (ii) Both A and R are true but R is not the correct explanation of A

Explanation: The carbon 12 isotope defines the mass of atoms and molecules.

i

Which of the following compounds has tetrahedral geometry? (a) $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2}$ (b) $\left[\mathrm{Pd}(\mathrm{CN})_{4}\right]^{2-}$ (c) $\left[\mathrm{PdCl}_{4}\right]^{2-}$ (d) $\left[\mathrm{NiCl}_{4}\right]^{2}$

Find the vector equation of the line passing through the point with position vector and parallel to the vector Deduce the Cartesian equations of the line.

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