Hydrogen gas is colorless and odorless.

Hydrogen is classified as a non-metal.

Ionic compounds are generally soluble in water due to the strong interactions between ions and water molecules.

Lanthanide contraction refers to the decrease in atomic radius across the lanthanide series due to poor shielding of f-electrons.

Lanthanides are known for their high density and are typically metallic in nature.

Metals are typically good conductors of heat and electricity and have a shiny appearance.

Noble gases are colorless and odorless under standard conditions.

P-block metals, such as Lead and Tin, are generally brittle.

Carbon can form multiple bonds, such as double and triple bonds, due to its tetravalency.

Transition metals exhibit variable oxidation states due to the involvement of d-electrons in bonding.

A purely imaginary number has no real part, so 0 + 5i is purely imaginary.

Hydrogen gas (H2) can act as a reducing agent for aldehydes, converting them to alcohols.

C is the reducing agent as it donates electrons to reduce CuO to Cu.

H2 in the presence of palladium (Pd) is a reducing agent that can reduce ketones to alcohols.

Fructose is a reducing sugar, while sucrose, starch, and cellulose are not.

Solar energy is a renewable energy source that can be harnessed without depleting natural resources.

Solar energy is a renewable source of energy that helps reduce environmental pollution compared to fossil fuels.

Solar energy is a renewable source of energy that can be harnessed without depleting natural resources.

The roots are z = ±i.

Temperature is a scalar quantity as it has magnitude but no direction.

2-pentanol has the hydroxyl group on the second carbon, making it a secondary alcohol.

Dimethylamine is a secondary amine as it has two alkyl groups attached to the nitrogen.

Excessive caffeine can lead to insomnia and disrupt sleep patterns.

Enthalpy is a state function, while work and heat are not state functions as they depend on the path taken.

Glycogen is the storage form of glucose in animals, while starch serves this role in plants.

The -CH3 group is a strong +I effect group as it donates electron density through the inductive effect.

-NO2 is a strong -M group as it withdraws electron density through resonance.

HCl (hydrochloric acid) is a strong acid that completely dissociates in water.

NaOH (sodium hydroxide) is a strong base that completely dissociates in solution.

Ammonia (NH3) is a strong nucleophile due to the presence of a lone pair of electrons on the nitrogen atom.