List of top Chemistry Questions

Addition of $ SnC{{l}_{2}} $ to $ HgCl_2$ gives precipitate:

In fermentation by zymase, alcohol and $ C{{O}_{2}} $ are obtained from:

Which will reduce zinc oxide to zinc?

By Wurtz reaction, a mixture of methyl iodide and ethyl iodide gives :

The enthalpy of combustion of H₂, cyclohexene (C₆H₁₀) and cyclohexene (C₆H₁₂) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:

The enthalpy of hydrogenation of cyclohexene is $-119.5 kJ mol ^{-1} .$ If resonance energy of benzene is $-150.4 kJ mol ^{-1}$, its enthalpy of hydrogenation would be:-

In a set of reactions propionic acid yielded a compound $D$. $CH_3CH_2COOH\xrightarrow{SOCL_2} B\xrightarrow{NH_3}C\xrightarrow [Br_2]{KOH} D$ The structure of $D$ would be

What is the two third life of a first order reaction having $ k=5.48\times 10^{-14}s^{-1} $

The end products in the Cannizaro reaction of benzaldehyde is

What will be the IUPAC name of given compound?

What is the conjugate base of $ \text{HSO}_{4}^{-} $ ?

Observe the following reaction : $ A(g)+3B(g)\xrightarrow{{}}2C(g) $ The rate of this reaction $ \left( -\frac{d[A]}{dt} \right) $ is $ 3\times {{10}^{-3}}\,\text{mol}\,{{\text{L}}^{-1}}. $ What is the value of $ -\frac{d[B]}{dt} $ in $ \text{mol}\,{{\text{L}}^{-1}}{{\min }^{-1}}. $ ?

Ethyl alcohol exhibits acidic character on reacting with

Consider the following reactions : (i) $ Al+NaOH+{{H}_{2}}O\xrightarrow{\Delta } $ (ii) $ {{F}_{2}}+NaOH(conc.)\xrightarrow{{}} $ (iii) $ NaOH+P(white)+{{H}_{2}}O\xrightarrow{{}} $ The correct set of reactions which give gaseous product is

The specific charge of a proton is $9.6 \times 10^7 \, C \, kg^{-1}$. The specific charge of an alpha particle will be :

Which one of the following is not a colloid?

Oleum is

In the removal of silica during smelting, the flux used is

Lead metal is purified by

Which one of the following does not exist in $\alpha$ and $\beta$ forms?

In sugar industry, activated charcoal is used for the decolourisation of cane juice as

$-M$ effect is shown by

Sulphur dioxide is prepared by the action of

Which one of the following is not affected by concentrated sulphuric acid ?