States of Matter

In chemistry, an ideal solution or ideal mixture is a solution with thermodynamic properties analogous to those of a mixture of ideal gases. The enthalpy of solution (or enthalpy of mixing) is zero as is the volume change on mixing; the closer to zero the enthalpy of solution is, the more ideal the behavior of the solution becomes.

In chemistry, a mixture is a material system made up by two or more different substances which are mixed together but aren't combined chemically. Mixture refers to the physical combination of two or more substances the identities of which are retained. It can be either homogeneous or heterogeneous.

This option is correct as in molarity there is volume term which alters with respect to temperature, M=no. of moles of solute/volume of solution in litres. By increasing the temperature volume expands and molarity decreases.

This option is correct as molality does not changes with temperature as there is no volume term in the formula of molality, M = no. of moles of the solute/mass of solvent in kg.

Money is the most liquid asset because it can be immediately used for transactions and is universally accepted as a medium of exchange. Shares (B) need to be sold, Gold (C) needs to be converted, and Debentures (D) are debt instruments that take time to liquidate. Liquidity refers to how quickly an asset can be converted to cash without loss of value.

Water exhibits anomalous expansion when heated from 0°C to 10°C. Initially, volume decreases until 4°C (maximum density point), then increases normally. This unique property is crucial for aquatic life survival in cold climates.

Deuterium oxide (D2O) is called heavy water because deuterium is an isotope of hydrogen with twice the mass. Regular water is H2O, and light water is not a standard term.

 When water boils, it turns into vapors. When the temperature falls on touching the wall, the vapors condense.

The first stage (PS1) of PSLV uses a solid propellant motor (S139) based on HTPB composite propellant, not liquid or hybrid systems. Subsequent stages use liquid propulsion.

Eosin methylene blue agar and hektoen enteric agar are the correct examples of a Selective and differential media.

Water is a compound (H2O) with fixed chemical composition. Air is a mixture of several gases (nitrogen, oxygen, carbon dioxide, etc.) that are not chemically combined and can vary in proportion. This is the correct analogy: water:compound::air:mixture.

When warm air containing water vapor comes in contact with a cool surface, condensation occurs. This phase change from gas (water vapor in air) to liquid (water droplets) is the same process that causes dew to form on grass or water droplets on cold drinks.

Changing of water vapour into water is called condensation.

The melting of an ice candy is a reversible change because ice candy melts due to increased temperature (room temp).

When a state change occurs from solid to liquid, particles gain energy.