Metals and Non-Metals — Science STD 10 — Question

Aqueous solutions of zinc sulphate and iron sulphate were taken in test tubes I and II by four students A,  B,  C and D . Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours were recorded in the form of table as given below:

The correct reporting has been made in observations:

Which of the following is (are) true when HCl (g) is passed through water?

1. It does not ionise in the solution as it is a covalent compound.
2. It ionises in the solution.
3. It gives both hydrogen and hydroxyl ion in the solution.
4. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.

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

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

1. Reducing agent.
2. Oxidising agent.
3. Catalyst.
4. Dehydrating agent.

A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride, sodium hydroxide and sodium carbonate respectively. If he now brings a burning splinter near the mouth of the test tubes immediately after adding the ethanoic acid in each one of them, in which of the test tube or test tubes the flame gets extinguished?

Although metals form basic oxides, which of the following metals form an amphoteric oxide?

1. Na
2. Ca
3. Al
4. Cu

In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. The compound X and Y could be:

The discomfort caused by indigestion due to overeating can be cured by taking:

1. Vinegar.
2. Lemon juice.
3. Baking soda.
4. Caustic soda.

See the reaction below: 2AgBr → 2Ag + Br₂ What type of reaction is this?

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