List of top Chemistry Questions

Electrode potential of hydrogen electrode is $18\, mV,$ then $[H^+]$ is

Blue colour of the sky is due to

The one which is least basic is

"No two electrons in an atom will have all the four quantum numbers same". The statement is known as

The highest oxidation state of $ Os$ is $+ 8$. Osmium is a $5$ $d$-block element.

Phenol forms $2,4, 6$-tribromophenol on treatment with $Br_{2}$ in carbon disulphide at $273 \,K$. Bromine polarises in carbon disulphide.

On adding zinc pieces to aqueous $FeCl_{3}$ solution, colour changes from deep yellow to light green. Aqueous $FeCl_{3}$ is acidic and on adding $Zn$, nascent hydrogen is produced which reduces deep yellow $FeCl_{3}$ solution to light green $FeCl_{2}$solution.

Number of radial and angular nodes for $3p$-orbital are 1, 1 respectively. Number of radial and angular nodes depends only on principal quantum number.

Formic acid reduces Tollen?? reagent. Compounds containing $??HO$ group reduce Tollen?? reagent.

Cu is stronger reducing agent than $H_2$. E$^{\circ}$ of $Cu^{2+}/Cu$ is negative.

Bond dissociation energy is $F_2 > Cl_2$. $Cl_2$ has more electronic repulsion than $F_2$.

Which of the following is not an ore of iron?

Arrange the following compounds in increasing order of reactivity towards nucleophilic addition reaction. (I)$C_6H_5COCH_3$ (II) $CH_3 CO-C_2H_5$ (III)$C_6H_5CHO$ (IV) $Cl-CH_2 - CHO$

Electron affinity is positive, when

What would be the expected product of the reaction of propyne with$ Br_{2}/H_{2}O$ if the mechanism of this reaction is analogous to that of propene?

When acidified $K _{2} Cr _{2} O _{7}$ solution is added to $Sn ^{2+}$ salts, then $Sn ^{2+}$ changes to

The composition of a sample of wustite is $Fe _{0.93} O$. What percentage of the iron is present in the form of Fe (III)?

At $300 \,K , 36\, g$ of glucose present per litre in its solution has an osmotic pressure of $4.98$ bar. If the osmotic pressure of solution is $1.52$ bar at the same temperature, what would be its concentration?

How many $mL$ of $0.125\, M \,Cr ^{3+}$ must be reacted with $12.00 \,mL$ of $0.200\, M\, MnO _{4}^{-}$if the redox products are $CrO _{7}^{2-}$ and $Mn ^{2+}$ ?

The strongest acid among the following is

On commercial scale phenol is obtained from chlorobenzene. The chlorobenzene needed for the purpose is prepared byRaschig?? process. Which one of the following is Raschig?? process?

According to Hardy schulze law, the flocculating power of an ion increases with

Grignard reagents and organolithium compounds on addition to dry ice separately, followed by hydrolysis gives

Hardening of leather in tanning industry is based on

For isothermal expansion of an ideal gas, the correct combination of the thermodynamic parameters will be