JEE Main 2016 · 10 Apr · Shift 1 · Chemistry Q49

ChemistrySingle correct+4 / -1Question 49 of 90

The transition metal ions responsible for color in ruby and emerald are, respectively :

\ce{Cr^3+}

and

\ce{Co^3+}

\ce{Co^3+}

and

\ce{Cr^3+}

\ce{Co^3+}

and

\ce{Co^3+}

\ce{Cr^3+}

and

\ce{Cr^3+}

Answer and worked solution

Official answer: D

Both ruby ( $\ce{Al2O3}$ ) and emerald (beryl) owe their colour to $\ce{Cr^3+}$ impurities.

JEE Main 2016 · 10 Apr · Shift 1, Chemistry question 49