${}_{27}{}^{60}\mathrm{Co}$, an isotope of cobalt, is used:

Important Questions on Structure of Atom

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 46

${}_6{}^{14}\mathrm{C}$, an isotope of carbon, is used :

EASY

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 47

Natural chlorine has two isotopes   ${}_{17}{}^{37}\mathrm{Cl}$ and  ${}_{17}{}^{35}\mathrm{Cl}$ in the ratio of 1:3. The average atomic mass of chlorine is:

MEDIUM

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 48

Bromine is available in the form of two samples ${}_{35}{}^{79}\mathrm{Br}$(49.7%) and  ${}_{35}{}^{81}\mathrm{Br}$ (50.3%). The average atomic mass of bromine is:

EASY

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 49

An element E is available in the form of two isotopes  ${}_{15}{}^{31}\mathrm{E}$(75.8%) and  ${}_{15}{}^{33}\mathrm{E}$(24.2%). The average atomic mass of E is:

HARD

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 50

The average atomic mass of a sample $\mathrm{X}$ is $16.2 \mathrm{u}$. The percentages of  ${}_8{}^{16}\mathrm{X}$  and ${}_8{}^{18}\mathrm{X}$ in it are:

EASY

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 51

The average atomic mass of a sample X is $23.04 \mathrm{u}$. The $\%$ ages of  ${}_{11}{}^{23}\mathrm{X}$and  ${}_{12}{}^{24}\mathrm{X}$ in it are:

EASY

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 1

Explain why  ${}_2{}^3\mathrm{He}$ and ${}_1{}^3\mathrm{H}$ are not considered isotopes.

EASY

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IMPORTANT

Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 2

Why do the isotopes of same element have similar chemical properties?