Which of the following statement(s) is/are correct about the trend of ionization energies of elements in the periodic table down Group

• A. The noble gases have the highest ionization energies in each period.
• B. Ionization energy decreases down group
• C. lonization energy generally increases from left to right across a period
• D. The alkali metals have the lowest ionization energies in each period

A salt which loses mass when exposed to air is?

• A. hygroscopic.
• B. deliquescent
• C. efflorescent
• D. fluorescent

When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was

• A. concentrated
• B. supersaturated
• C. unsaturated
• D. saturated

The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is

• A. soap
• B. sodium ethanoate
• C. sodium methoxide
• D. water

The gas that is removed by the water in the flask is

• A) O 2
• B) SO 2
• C) HCI
• D) H 2

Which of the following processes will pollute water?

• A. Exposure of a body of water ultraviolet rays
• B. Discharge of industrial effluents effluents into water ways
• C. Passage of river water through a send bed
• D. Addition of a measured quantity of chlorine to water

An aqueous solution of (NH₄)₂ SO₄ is

• A. Acidic
• B. Alkaline
• C. Amphoteric
• D. Neutral

Which one of the following changes is physical?

• A) Adding iron filings to aerated water
• B) Adding sodium metal to water
• C) Cooling a solution of iron (II) sulphate to obtain the hydrated salt
• D) Cooling water to obtain ice

When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchange. This showed that the solution was

• A. supersaturated
• B. concentrated
• C. unsaturated
• D. saturated

The compound whose formula is written below is a major component of a soft fatty substance:

(a) State the change that would be observed in the physical state of the fatty substance if hydrogen were bubbled through it for long time in the presence of finely divided nickel at about 180\(^o\)C

(c) Determine the amount (in mole) of hydrogen that would be consumed if one mole of the component reacted completely with hydrogen.

(c) State the product of the reaction of the fatty substance with hot concentrated sodium hydroxide solution