Fill in the blanks from the choices given in brackets:
i. The energy required to remove an electron from a neutral isolated
gaseous atom and convert it into a positively charged gaseous ion is
called ____________. (electron affinity, ionization potential,
electronegativity)
ii. The compound that does not have a lone pair of electrons is __________.
(water, ammonia, carbon tetra chloride)
iii. When a metallic oxide is dissolved in water, the solution formed has a
high concentration of ____________ ions (``\ce{H+, H3O+, OH-}``)
iv. Potassium sulphite on reacting with hydrochloric acid releases _______
gas. ``\ce{Cl2, SO2, H2S}``)
v. The compound formed when ethene reacts with Hydrogen is ________.
(``\ce{CH4, C2H6, C3H8}``)

Choose the correct answer from the options given below:

A chloride which forms a precipitate that is soluble in excess of
ammonium hydroxide, is:
1. Calcium chloride
2. Ferrous chloride
3. Ferric chloride
4. Copper chloride

If the molecular formula of an organic compound is ``\ce{C10H18}`` it is:
1. alkene
2. alkane
3. alkyne
4. Not a hydrocarbon

Which of the following is a common characteristic of a covalent
compound?
1. high melting point
2. consists of molecules
3. always soluble in water
4. Conducts electricity when it is in the molten state

To increase the pH value of a neutral solution, we should add:
1. an acid
2. an acid salt
3. an alkali
4. a salt

Anhydrous iron(III) chloride is prepared by:
1. direct combination
2. simple displacement
3. decomposition
4. neutralization

Identify the substance underlined, in each of the following cases:

Cation that does not form a precipitate with ammonium hydroxide but forms one
with sodium hydroxide.

The electrolyte used for electroplating an article with silver.

The particles present in a liquid such as kerosene, that is a non electrolyte.

An organic compound containing . COOH functional group.