Chemistry - MOST IMPORTANT RPSC RAS Previous Year Questions

Neutron and electron are present in nucleus and proton rotates around the nucleus

Electron and proton are present in nucleus and proton rotates around the nucleus

Proton and neutron are present in nucleus and electron rotates around the nucleus

Proton, neutron and electrons, all are present in nucleus

Bauxite

Phosphorus

Graphite

Silicon oil

O2 gas

CO2 gas

CO gas

H2O gas

Chlorine

Bromine

Iodine

Fluorene

A-$\displaystyle 2$, B-$\displaystyle 1$, C-$\displaystyle 3$, D-$\displaystyle 4$

A-$\displaystyle 3$, B-$\displaystyle 4$, C-$\displaystyle 2$, D-$\displaystyle 1$

A-$\displaystyle 2$, B-$\displaystyle 4$, C-$\displaystyle 3$, D-$\displaystyle 1$

A-$\displaystyle 3$, B-$\displaystyle 1$, C-$\displaystyle 2$, D-$\displaystyle 4$

Butane, hydrogen and methane

Butane, propane and ethane

Oxygen, hydrogen, acetylene

Hydrogen, methane and oxygen

Carbon, natural gas

Hydrogen, natural gas

Nitrogen, natural gas

Carbon, hydrogen

Acitic acid

Ascorbic acid

Citric acid

Lactic acid

Citric acid

Oxalic acid

Urea

Phosphoric acid

Potassium cyanide

Methanol and pyridine

Acetic acid and pyridine

Methanol Naphthalene

$\displaystyle 57$%

$\displaystyle 69$%

$\displaystyle 46$%

$\displaystyle 52$%

A, C, D

A, B, D

A, B, C

B, C, D

Citric acid

Sulphuric acid

Nitric acid

Phosphoric acid

Dispersion of white light into the light of seven colours when passed through a prism

Softening of vegetables when cooked

Wet soil lamp when dried gets fragile

Dissolving of salt in water

Rutherford

Dalton

Einstein

Thomson

Nitric acid

Sulphuric acid

Hydrochloric acid

All of the above

The substance will completely decay in $\displaystyle 20$ days.

The substance will completely decay in $\displaystyle 40$ days.

$\displaystyle 3$/$\displaystyle 4$ part of the substance will decay in $\displaystyle 20$ days.

$\displaystyle 1$/$\displaystyle 4$ part of the substance will decay in $\displaystyle 5$ days.

Na2 CO3

NaHCO3

CaCO3

NaOH

Sodium bicarbonate (Sodium hydrogen carbonate)

Sodium carbonate

Potassium bicarbonate (Potassium hydrogen carbonate)

Potassium carbonate

CaSO4

CaSO4.1/2H2O

CaSO4.H2O

CaSO4.2H2O