List of top Chemistry Questions

Calculate the standard enthalpy change for the following reaction,
\(2\text{C}_2\text{H}_6\text{(g)}+7\text{O}_2\text{(g)}⟶4\text{CO}_2\text{(g)}+6\text{H}_2\text{O}\text{(l)}\)
Given, \(\Delta _fH^{\circ}(\text{C}_2\text{H}_6) = -85 \text{kJ mol}^{-1}\)
\(\Delta _fH^{\circ}(\text{CO}_2) = -390 \text{kJ mol}^{-1}\)
\(\Delta _fH^{\circ}(\text{H}_2\text{O}) = -285 \text{kJ mol}^{-1}\)
Select the incorrect statement from the following.
Which from following colours has highest energy if wave lengths of violet, blue, yellow and red light are 410 nm, 470 nm, 580 nm and 750 nm respectively ?
Which of the following ethers is gaseous at room temperature ?
Which from following gases is least soluble in water at same temperature and pressure ?
Find the number of molecules present in 70 g dinitrogen.
Which medicinal property is exhibited by methylsalicylate?
Which from following polymers is NOT obtained by addition polymerisation method?
What is the total mass of products obtained when one gram mole of sucrose is hydrolysed?
Which from following is NOT a globular protein?
Identify final products in the following sequence of reactions
\(\text{RCOOH}+\text{R’OH}\overset{\text{H}^+\,}{\rightarrow }\text{intermediate}\overset{\text{Ni},\Delta \,}{\rightarrow }^{\text{H}_2}\text{Products}\)
Which from following amines does NOT form alkyl isocyanide when heated with alc. KOH and chloroform
Which from following statements is NOT correct regarding Hofmann's exhaustive alkylation?
Propyne on reaction with water in presence of \(40\%\) sulphuric acid and \(1\%\) mercuric sulphate forms
Which of the following has largest size?
Benzonitrile on reaction with a reagent in dry ether followed by hydrolysis forms benzophenone along with ammonia and hydroxymagnesium bromide. Identify the reagent used in above transformation.
Identify the reagent 'R' used in the following reaction
\(\text{C}_6\text{H}_5\text{COCl}\overset{\text{R}\,}{\rightarrow }\text{C}_6\text{H}_5\text{CHO}+\text{HCl}\)
Identify the product 'B' in the following reaction
\(\text{Isopropyl cyanide}\overset{\text{SnCl}_2,\text{HCl}\,}{\rightarrow }\text{A}\overset{\text{H}_3\text{O}^+\,}{\rightarrow }\text{B}+\text{NH}_4\text{Cl}\)
Identify the product P obtained in following reaction
Which among the following has lowest boiling point?
Which from following is obtained by hydroboration - oxidation of propene?
The reaction of aryl halide with sodium metal in dry ether to give biphenyl is known as
Which actinoid from following has smallest ionic size in \(+3\) state?
Find EAN of Fe in \(\text{Fe(CO)}_5\)
What is the total number of transition series of d-block elements?