List of top Chemistry Questions

From the elements of 3d series below, which element shows the maximum number of oxidation states?
Which alkyl halide from the given options will undergo S$_N$1 reaction faster?
The correct Mathematical expression of Arrhenius equation is:
Arrange the following compounds in the increasing order of their basic strength in the gaseous phase:
C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_3$N, (C$_2$H$_5$)$_2$NH
Aniline readily reacts with bromine water to give 2, 4, 6-tribromoaniline.
Give reasons for the following:
Methyl amine is more basic than aniline.
Primary amines have higher boiling points than tertiary amines.
A solution containing 2 g of glucose (M = 180 g mol$^{-1}$) in 100 g of water is prepared at 303 K. If the vapour pressure of pure water at 303 K is 32.8 mm Hg, what would be the vapour pressure of the solution?
Calculate the mass of CaCl$_2$ (molar mass = 111 g mol$^{-1}$) to be dissolved in 500 g of water to lower its freezing point by 2K, assuming that CaCl$_2$ undergoes complete dissociation.
Predict whether Van’t Hoff factor will be less or greater than one when Ethanoic acid is dissolved in benzene.
What is Hinsberg’s reagent?
Define reverse osmosis.
Why are aquatic species more comfortable in cold water in comparison to warm water?
Define ideal solution.
Why is first ionization enthalpy of chromium lower than that of Zn?
Why Zinc is not regarded as a transition element?
Why are transition elements good catalysts?
What is Lanthanoid contraction?
What happens when ethyl chloride is treated with alcoholic potassium hydroxide?
Show that the time required for 99.9% completion in a first-order reaction is 10 times of half-life (t$_{1/2}$) of the reaction.
Predict whether \([CoF_6]^{3-}\) is diamagnetic or paramagnetic and why?
\([Atomic \ \ number : Co = 27]\)
Calculate emf of the following cell at 25°C:
Sn/Sn$^{2+}$(0.001 M) || H$^+$(0.01 M) | H$_2$(g)(1 bar) | Pt(s)
Given: E°(Sn$^{2+}$/Sn) = -0.14 V, E° H$^+$/H$_2$ = 0.00 V (log 10 = 1)
What is meant by a unidentate ligand? Give an example.
The presence of –NO$_2$ group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution reactions. Give reason to explain the above statement.
Give chemical tests to distinguish between the following pairs of compounds:
(i) Phenol and Benzoic acid:
(ii) Propanal and Propanone: