List of top Chemistry Questions asked in BCECE

The wavelength of the first spectral line of sodium is $5896 \,??. The first excitation potential of sodium atom will be $\left(h=6.63 \times 10^{-34} \,Js \right)$

Which one of the following has square planar structure?

The chemical formula of plaster of Paris is

Zinc and cold dil. $ HNO_3$ reacts to produce

Tincture of iodine is

Methyl- $\alpha$ -D-glucoside and methyl $\beta$ -D-glucoside are

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 :

Some chemists at ISRO wished to prepare a saturated solution of a silver compound and they wanted it to have the highest concentration of silver ion possible. Which of the following compounds, would they use? $K_{s p}( AgCl )=1.8 \times 10^{-10} $ $K_{s p}( AgBr )=5.0 \times 10^{-13} $ $K_{s p}\left( Ag _{2} CrO _{4}\right)=2.4 \times 10^{-12}$

The stability of ferric ion is due to:

A cyclic hydrocarbon molecule has all the carbon and hydrogen is a single plane. All the carbon-carbon bonds are of same length, less than $ 1.54\,?? but more than $ 1.34 \,?? $ The C-C bond angle will be:

Which reagent can convert acetic acid into ethanol ?

When $ C{{H}_{3}}COOH $ reacts with $ C{{H}_{3}}-MgX: $

Acetals are

Variable oxidation state and degenerated orbital shows:

What amount of water is added in $40\, mL$ of $NaOH (0.1\, N )$ which is neutralized by $50 \,mL$ of $HCl (0.2 N ) ?$

Steroid hormone is derived from :

Three elements $A, B$ and $C $ having reduction potential $-1.5,-0.5 $ and $ 1.5\,V $ respectively then arrange them in correct order according to reducing power:

Which of the following is more acidic in nature?

Unit of the constant of zero order reaction is:

A gas has a vapour density $11.2.$ The volume occupied by $lg$ of the gas at NTP is :

Arrange the following as increase in oxidation number : (i) $Mn ^{2+}$ (ii) $MnO _{2}$ (iii) $KMnO _{4}$ (iv) $K _{2} MnO _{4}$

The standard reduction potential $E^{o}$ for the half reactions are as: $Z n \rightarrow Z n^{2+}+2 e^{-}, E^{o}=0.76\, V$ $C u \rightarrow C u^{2+}+2 e^{-}, E^{o}=0.34\, V$ The emf for the cell reaction: $Z n+C u^{2+} \rightarrow Z n^{2}+C u$