Chemistry Test - 10

Less reactive metal will be displaced by more reactive metal in its salt solution.

Zeolite is used to purify water using permutit method.

No change will happen

The number of water molecules in gypsum and in plaster of Paris are$2$ and $\frac{1}{2}$respectively. This means that the ratio of the water molecules in plaster of Paris and gypsum is$\frac{1}{2}:2=1:4$.

It is described by the de-Broglie equation

λ = h/mv, where λ is wavelength, h is Planck'sconstant, m is themassof a particle, moving at avelocityv. de Broglie suggested that particles can exhibit properties of waves

By Hund’s rule, the electron configuration of carbon, which is 1s 2 2s 2 2p 2, is understood to correspond to the orbital diagram shown in c. Experimentally, it is found that the ground state of a neutral carbon atom does indeed contain two unpaired electrons.

Iodoform reaction is a confirmatory test for compounds having\(-{COH}_{3}\).

Iodoform test is used to check the presence of carbonyl compounds with the structure \({R}-{CO}-{H}_{3}\) or alcohols with the structure \({R}-{CH}({OH})-{CH}_{3}\) in a given unknown substance.

The temperature at which the volume of a gas becomes zero is called absolute zero temperature.

The element with the highest electrical conductivity is Silver.

The substance that increases the speed of a chemical reaction is called a Catalyst.

A catalyst is a substance added to a chemical reaction to increase its rate.

Example:Finely divided iron is used as a catalyst in the formation of ammonia(Haber process)

\({N}_{2}({~g})+3 {H}_{2}({~g}) \Leftrightarrow 2 {NH}_{3}({~g})\)