KCET · Chemistry · Chemical Kinetics
Which of the following crystal has unit cell such that \( \mathrm{a} \neq \mathrm{b} \neq \mathrm{c} \) and \( \alpha \neq \beta \neq \mathrm{V} \neq 90^{\circ} ? \)
- A \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
- B \( \mathrm{NaNO}_{3} \)
- C \( \mathrm{KNO}_{3} \)
- D \( \mathrm{K}_{2} \mathrm{SO}_{4} \)
Answer & Solution
Correct Answer
(A) \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
Step-by-step Solution
Detailed explanation
The crystal lattice parameters for the given crystal is:
\[
\begin{array}{l}
\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}: a \neq b \neq c \alpha \neq \beta \neq \gamma \neq 90^{\circ} \\
\mathrm{N} \mathrm{aNO}_{3}: a \neq b \neq C \alpha=\beta=\gamma=90^{\circ} \\
\mathrm{KNO}_{3}: a \neq b \neq C \alpha=\beta=\gamma=90^{\circ} \\
\mathrm{K}, \mathrm{SO}_{4}: a \neq b \neq c \alpha=\gamma=90^{\circ}, \beta \neq 90^{\circ}
\end{array}
\]
\[
\begin{array}{l}
\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}: a \neq b \neq c \alpha \neq \beta \neq \gamma \neq 90^{\circ} \\
\mathrm{N} \mathrm{aNO}_{3}: a \neq b \neq C \alpha=\beta=\gamma=90^{\circ} \\
\mathrm{KNO}_{3}: a \neq b \neq C \alpha=\beta=\gamma=90^{\circ} \\
\mathrm{K}, \mathrm{SO}_{4}: a \neq b \neq c \alpha=\gamma=90^{\circ}, \beta \neq 90^{\circ}
\end{array}
\]
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