List of top Chemistry Questions

The mass of 60% HCl by mass required for the neutralisation of 10 L of 0.1 M NaOH is

Draw all the isomers (geometrical and optical) of: 
(i) \([CoCl_2(en)_2]^{+}\) 
(ii)\( [Co(NH_3)Cl(en)_2] ^{2+} \)
(iii)\( [Co(NH_3)_2Cl_2(en)]^{+}\)

$0.833$ mole of a carbohydrate with empirical formula $CH_{2}O$ , has $10\, g$ of hydrogen. Molecular formula of the carbohydrate is
Define the term solution. How many types of solutions are formed? Write briefly about each type with an example.

How would you account for the following: 

  1. Of the d4 species, Cr2+ is strongly reducing while manganese(III) is strongly oxidising. 
  2. Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised. 
  3. The d1 configuration is very unstable in ions.

Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

Which of the following is/are endothermic reaction(s)?

The equilibrium concentrations of the species in the reaction A+B\(\to\)C+D are 2, 3, 10 and 6 mol L–1, respectively at 300 K. ΔGº for the reaction is (R = 2 cal/mol K)

A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy \(\frac 13\) of tetrahedral voids. If the formula of the compound is A,By. then the value of x +y is in option

Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S.
major products Q, R and S
The numerical value of N/n (where N is the number of molecules in a given sample of gas and n is the number of moles of the gas) is
Of the three molecules $XeF_4, SF_4 ,SiF_4$ one which have tetrahedral structures is
A sample of drinking water was found to be severely contaminated with chloroform \((CHCl_3)\) supposed to be a carcinogen. The level of contamination was 15ppm (by mass):
(i) express this in percent by mass
(ii) determine the molality of chloroform in the water sample.
In the electrolysis of molten NaCl, the product obtained at the cathode is:
Explain the difference between a strong acid and a weak acid. How does the pH of a solution change when a strong acid is added compared to a weak acid?
You are given 100 mL of a 0.1 M solution of HCl and 200 mL of a 0.2 M solution of NaOH. Calculate the pH of the resulting solution after mixing the two solutions.
You are given a set of experimental data for a chemical reaction, including the concentrations of reactants and products at different times. Determine the order of the reaction and the rate constant.
The density of kerosene is $800 \,kg \,m^{-3}$. Its relative density is
For a first-order reaction, the time required to reduce the concentration of the reactant to half its initial value is:
Which of the following is an example of physisorption?
The EAN of cobalt in the complex \([Co(NH_3)_6]^{3+\) is:}
$44g$ of a sample on complete combustion gives $88$ $gm$ $CO_2$ and $36$ $gm$ of $H_2O$. The molecular formula of the compound may be:
Mixing of $N_2$ and $H_2$ form an ideal gas mixture at room temperature in a container. For this process, which of the following statement is true?

Give the structures of A, B and C in the following reactions: 

The number of atoms in 4.5 g of a face-centred cubic crystal with edge length 300 pm is :
(Given density=10gcm-3 and NA=6.022×1023).