Chemical Reactions and Equations — Science STD 10 — Question

Define brittleness.

Which of the following sets of materials can be used for conducting a saponification reaction for the preparation of soap?

According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

1. Decreasing atomic numbers.
2. Increasing atomic numbers.
3. Decreasing atomic masses.
4. Increasing atomic masses.

Which one of the following elements exhibit maximum number of valence electrons?

1. Na.
2. Al.
3. Si.
4. P.

The substance which can produce brisk effervescence with baking soda solution is:

Which of the given statement is correct or wrong:
Statement A: Detergent with less branching in the molecule is degraded more easily than branched-chain detergents.
Statement B: Soaps are 100% biodegradable.

Sodium carbonate is a basic salt because it is a salt of:

1. Strong acid and strong base.
2. Weak acid and weak base.
3. Strong acid and weak base.
4. Weak acid and strong base.