Class 9 · Science and Technology · 10 Aug 2026

1.

Which of the following properties makes baking powder suitable for bakery products like bread and cakes?

[2 marks]

(a) It releases oxygen gas on heating, killing bacteria.

(b) It reacts with moisture to release carbon dioxide, making the dough spongy and light.

(c) It neutralizes all flour proteins to enhance gluten strength.

(d) It absorbs moisture from the air to keep bread dry.

2.

Match the following carbon compounds with their respective functional groups or classes:

[3 marks]

Column A	Column B
1. CH3OH	a. Alcohol
2. HCHO	b. Aldehyde
3. CH3COCH3	c. Ketone
4. CH3COOCH3	d. Ester

Answer: __________________________________________

Q.3 Fill in the Blanks [3 marks]

(a)

Buckminsterfullerene is a spherical allotrope containing _____ carbon atoms arranged in pentagons and hexagons.

[1 mark]

(b)

The property of a substance to absorb moisture from the atmospheric air and dissolve in it to form a saturated solution is known as _____, whereas substances that lose their water of crystallization to the air are called _____ substances.

[2 marks]

4.

State the primary chemical property that makes baking soda (sodium hydrogen carbonate) useful in antacids.

[1 mark]

5.

Diagram AI visual

Identify the standard hazard pictogram parts indicated in the reference SVG.

[1 mark]

Label the following: 1. ___________________ 2. ___________________ 3. ___________________ 4. ___________________