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MODEL PAPER - 6 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 6 [2026]5 Marks
Question
An acid $\mathbf{X}$ present in tamarind when mixed with $\mathbf{Y}$, produces a mixture $\mathbf{Z} . \mathbf{Z}$ on addition to a dough when heated makes cakes soft and spongy. $\mathbf{Y}$ is prepared from common salt and helps in faster cooking.
i. Write the common names of $\mathbf{X}, \mathbf{Y}$ and $\mathbf{Z}$, and the chemical formula of $\mathbf{Y}$.
ii. How is $\mathbf{Y}$ prepared and how does it help in making cakes soft and spongy? Illustrate the reaction with suitable chemical equation.
iii. Write the name and chemical formula of a mild base other than $\mathbf{Y}$ used as an antacid.
✓

Answer

i. X-Tartaric acid Y-Baking soda Z- Baking powder Y- $\mathrm{NaHCO}_{3}$
ii. $\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}+\mathrm{NH}_{3} \longrightarrow \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NaHCO}_{3}$
$\mathrm{NaHCO}_{3}+\mathrm{H}^{+} \longrightarrow \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}+$ Sodium salt of acid
$\mathrm{CO}_{2}$ released during heating makes the cake soft and spongy
iii. Magnesium hydroxide; $\mathrm{Mg}(\mathrm{OH})_{2}$

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