Explanation

The coordination number of the metal in [Cu(EDTA)]²⁻ is six because EDTA (Ethylenediaminetetraacetate) is a hexadentate ligand.

This meaning it can bind to the metal ion through six donor atoms.

Explanation

Temperature increases kinetic energy, speeding up diffusion.

Intermolecular forces affect how easily gas particles move past each other.

Molecular mass affects rate inversely — lighter gases diffuse faster (Graham's Law).

Explanation

• Thermometer is the instrument used to measure temperature.
• It is a device that measures the temperature of a substance or environment, typically consisting of a glass tube filled with a liquid that expands or contracts in response to changes in temperature.

Explanation

When the 6d orbital is completely filled, the next electron enters the 7p orbital.

This is based on the Aufbau principle, which dictates that electrons first occupy the lowest energy levels available.

After the 6d orbitals (which can hold up to 10 electrons) are filled.

The 7p orbitals (which can hold up to 6 electrons) become the next lowest energy.

Explanation

Carboxylic acids contain the carboxyl group (–COOH), which gives them their acidic properties.

This group consists of a carbonyl (C=O) and hydroxyl (–OH) bonded to the same carbon atom.

Explanation

BF₃ (Boron trifluoride) is an electron-deficient molecule because boron has only 6 valence electrons after bonding, which is less than the stable octet.

It tends to accept a lone pair from other atoms to complete its octet, making it a Lewis acid.

Explanation

Absolute alcohol refers to 100% pure ethanol, free from any water content.

It is used in laboratories and industrial applications where water-free alcohol is essential.

Explanation

Potash mica (also known as muscovite) is an aluminum silicate mineral containing potassium.

It is a significant source of aluminum in silicate form.

Explanation

Black gold is a liquid based term applied to oil or petroleum.

It comes in black color when it comes out of the ground.

It is worth a great deal of money. Petroleum is black gold.

Coal is black diamond.

Explanation

Oxy-acetylene welding is a very common welding process.

Gases used in welding and cutting processes include:

• shielding gases such as carbon dioxide, argon, helium, etc.
• fuel gases such as acetylene, propane, butane, etc.

oxygen, used with fuel gases and also in small amounts in some shielding gas mixtures