Step 1: Understanding Baking Soda
Baking Soda is commonly known as Sodium Bicarbonate and its chemical formula is NaHCO\(_3\). It is a white crystalline powder used in baking and also as a cleaning agent.
Step 2: Explanation of Other Options
- (A) CaOCl\(_2\) is the chemical formula for calcium oxychloride.
- (C) NH\(_4\)Cl is the formula for ammonium chloride.
- (D) Na\(_2\)CO\(_3\) is the formula for sodium carbonate.
Thus, the correct answer is (B) NaHCO\(_3\).
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.