List of top Chemistry Questions

The pH value of an acid is $5$ and its concentration is 1 M. What is the value of $ K_{a} $ for the acid?
Arrange in order of increasing acidic strength
Volume of $CO_{2}$ obtained from complete decomposition of $20 \,g$ $CaCO_{3}$ at STP is:
pH-scale was proposed by:
When a mixture of methane and oxygen is passed through heated molybdenum oxide, the main product formed is :
Which of the following solutions will have the highest boiling point?
Maximum freezing point falls in
NH
The reaction,$2SO_{2(g)} + O_{2(g)} \leftrightharpoons 2SO_{3(g)}$ is carried out in a $1\, dm^3$ vessel and $2 \,dm^3$ vessel separately. The ratio of the reaction velocities will be :
An artificial radioactive isotope gave ${^{14}_{7}N}$ after two successive $\beta$ -particle emissions. The number of neutrons in the parent nucleus must be :
The correct statement in respect of protein haemoglobin is that it
The frequency of radiation emitted when the electron falls from $n = 4$ to $n = 1$ in a hydrogen atom will be (Given ionisation energy of $H = 2.18\times 10^{18} $J $atom^{-1}$ and $h = 6.625 \times 10^{-34} Js)$
If the boiling point of ethanol (molecular weight = 46) is $ \text{78}{{\,}^{\text{o}}}\text{C,} $ what is the boiling point of diethyl ether ? (molecular weight =74)
What are X and Y in the reaction $ {{C}_{2}}{{H}_{4}}+{{H}_{2}}S{{O}_{4}}\xrightarrow{80{{\,}^{o}}C}X({{H}_{2}}O./\Delta a)Y $
The values of four quantum numbers of valence electron of an element are $ n=4,l=0,m=0 $ and $ s=+\frac{1}{2}. $ The element is:
The number of oxygen atoms bonded to each phosphorus atom in P$_4O_{10}$ is
Gun metal is an alloy of:
The hormone that helps in the conversion of glucose to glycogen is
You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose?
The chemical equilibrium of a reversible reaction is not influenced by :
Which of the following statement is not correct?
Glucose on oxidation gives the acid containing the C-chiral atoms equal to
The molecular formula of diphenyl methane How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom?
Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere
Reaction of $HBr$ with propene in the presence of peroxide gives