MODEL PAPER - 5 [2026] — Science STD 10 — Question

Which of the following are not ionic compounds?

1. KCl
2. HCl
3. CCl₄
4. NaCl

1. 1 and 2
2. 2 and 3
3. 3 and 4
4. 1 and 3

Na₂CO₃ . 10H₂O is:

The chemical which is not required for the preparation of soap in the laboratory is:

Which one of the following is non-crystalline or amorphous?

A solution turns the colour of turmeric to reddish brown. If the same solution is poured on universal indictor, its colour would change to-

The chemical reaction involved in the corrosion of iron metal is that of:

In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube well. After some time he is likely to observe that.

Identify the unsaturated compounds from the following:

1. Propane.
2. Propene.
3. Propyne.
4. Chloropropane.

1. 1 and 2
2. 2 and 4
3. 3 and 4
4. 2 and 3

When ethanol is heated with alkaline potassium permanganate solution, it gets converted into ethanoic acid. In this reaction, alkaline potassium permanganate acts as:

The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:

1. KCl
2. K₂SO₄
3. K₂CO₃
4. KNO₃