List of top Chemistry Questions

Read the given statements and select the correct option. Irrigation without proper drainage of water leads to waterlogging in the soil. Waterlogging draws salts to the soil surface, which are deposited as a thin crust on the land surface or start collecting at the roots of the plants.
Read the following statements and identify the incorrect statement.
Reaction that takes place at graphite anode in drycell is
Reaction $ {CH_3CONH_2 ->[NaOBr] }$ gives
Ratio of number of oxygen atoms in $Ca_3(PO_4)_2$ and $H_3PO_3$, if both contain same number of $P$ atoms, is
Reaction of $C_6H_5CH_2Br$ with aqueous sodium hydroxide follows___________.
Ratio of difference of spacing between the energy levels with $n=3$ and $n=4$ and the spacing between the energy levels with $n=8$ and $n=9$ for a hydrogen like atom or ion is
Random motion of colloid particle is known as
Rate law for the reaction, $A+2B$ $\rightarrow$ $C$ is found to be Rrte $=k\left[A\right]\left[B\right]$ Concentration of reactant $??'$ is doubled, keeping the concentration o f $???
$R-OH + HX \rightarrow RX + H_2O$. the reactivity of alcohols is
Quasi-fluid nature of membrane is due to
Quartz is an example of
Quartz is the crystalline variety of
Pyrosilicates are the silicates in which twotetrahedral units are linked at
Pyrex glass is a mixture of
Pyrolusite is an ore of
Purple of cassius is
Pure water does not conduct electricity because it
Pure nascent hydrogen is best obtained by
Pure methane can be produced by
Protonic acid is
Propanoyl chloride is subjected to reduction with $ {H_2}$ in boiling xylene in the presence of Pd supported on $ {BaSO_4}$. The product formed is
Primary, secondary and tertiary amines may be separated by using
Primary nitro compounds react with nitrous acid to form nitrolic acid which dissolve in NaOH giving
Pressure of $1 \,g$ of an ideal gas $A$ at $27 \, ^{\circ}C$ is found to be $2$ bar. When $2 \,g$ of another ideal gas $B$ is introduced in the same flask at same temperature the pressure becomes $3$ bar. What would be the ratio of their molecular masses?