Metals and Non-Metals — Science STD 10 — Question

Which one of the following property is generally not exhibited by ionic compounds?

1. Solubility in water.
2. Electrical conductivity in solid state.
3. High melting and boiling points.
4. Electrical conductivity in molten state.

A metal less reactive and another metal more reactive than hydrogen are:

1. Aaluminium and lead.
2. Iron and magnesium.
3. Copper and tin.
4. Copper and mercury.

The number of covalent bonds in pentane (molecular formula C₅H₁₂) is:

Heat is evolved during:

In terms of acidic strength, which one of the following is in the correct increasing order?

The number of isomers formed by the hydrocarbon with molecular formula C₅H₁₂ is:

1. 2
2. 5
3. 3
4. 4

While studying saponification reaction, a student measures the temperature of the reaction mixture and also finds its nature using blue/red litmus paper. On the basis of his observations the correct conclusion would be:

Wasp sting contains:

1. A sugar solution.
2. An acidic liquid.
3. A salt solution.
4. An alkaline liquid.

One of the following salts will give an alkaline solution on dissolving in water. This is:

1. Na₂CO₃
2. Na₂SO₄
3. NaCl
4. (NH₄)₂ SO₄

The by product in soap industry is: