List of top Chemistry Questions

A 5% solution of cane sugar (MW = 342) isisotonic with 1% solution of substance X. The molecular weight of X is

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200 g. The number of iron atoms (at. weight of Fe is 56) present in one molecule of haemoglobin are

Which one is not paramagnetic among the following? [at. no. of $Be = 4, N e = 10$ , $A s= 33,Cl= 17$]

The number of antibonding electron pairs in $O_2^{2-}$ molecular ion on the basis of molecular orbital theory is (at. no. of $O$ is $18$)

Which one of the following elements constitutes a major impurity in pig iron?

The total number of possible isomers for the complex compound $[Cu^{II}(NH_3)_4] [Pt^{II}Cl_4] $ are

Glucose reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of $ X $ is

The enormous diversity of protein molecules is due mainly to the diversity of

Which of the following compounds is not chiral ?

A one litre flask is full of brown bromine vapours. The intensity of brown colour of vapours will not decrease appreciably on adding to the flask some

In $ PO_{4}^{3-} $ ion, the formal charge on each oxygen atom and $P-O$ bond order respectively are :

The state of hybridization of B in $ \text{BC}{{\text{l}}_{\text{3}}} $ is :

The first emission line in the atomic spectrum of hydrogen in the Balmer series appears at:

The activity of ratio altitude $ ({{X}^{100}}) $ is 6.023 curie. If its disintegration constant is $ 3.7\times {{10}^{4}}{{\sec }^{-1}}, $ the mass of X is :

The standard reduction potentials at 298 K for the following half cell reactions are given below: $ Z{{n}^{2+}}(aq)+2{{e}^{-}}\rightleftharpoons Zn(s)-0.762 $ $ C{{r}^{3+}}(aq)+3{{e}^{-}}\rightleftharpoons Cr(s)-0.74 $ $ 2{{H}^{+}}(aq)+2{{e}^{-}}\rightleftharpoons {{H}_{2}}(g)\,0.00 $ $ F{{e}^{3+}}(aq)+{{e}^{-}}\rightleftharpoons F{{e}^{2+}}(aq)+0.77 $ Which one of the following is the strongest reducing agent?

The radii of $ \text{F,}{{\text{F}}^{-}}\text{O} $ and $ {{\text{O}}^{2-}} $ are in the order

Hydrogen bonding is not present

The richest source of vitamin A are:

Highly pure dilute solution of sodium in liquid ammonia

Which of the following salt has the same value of vant?s Hoff factor as that of $K _{3}\left[ Fe ( CN )_{6}\right]$ ?

The freezing point of a solution prepared from 1.25 g of non-electrolyte and 20 g of water is 271.9K. If molar depression constant is 1 86 $K m^{-1}$ then molar mass of the solute will be

The solubility of $BaSO_4$ in water is $2.33 \times 10^{-3}$ gram/litre. Its solubility product will be (molecular weight of $BaSO_4 = 233$)

Which of the following has highest boiling point?

For the first order reaction,

A first order reaction, which is $30\%$ complete in $30$ minutes has a half-life period of