List of top Chemistry Questions

The number of non-ionizable valences of Co$^{3+}$ and Pt$^{4+}$ ions in the complexes CoCl$_3\cdot5$NH$_3$ and PtCl$_4\cdot5$NH$_3$ is respectively
Identify the correct statements from the following
I. Adsorption is an endothermic process.
II. Adsorption of a gas on the surface of a solid is accompanied by a decrease in enthalpy and a decrease in entropy.
III. Adsorption capacity of A, B and C gases on 1g of activated charcoal follows the order A>B>C. Their critical temperatures (T$_c$) follow the order T$_c$(A)>T$_c$(B)>T$_c$(C).
Identify the correct statements from the following
I. In Leclanché cell, Mn$^{2+}$ is oxidized to Mn$^{3+}$
II. Electrolysis of aqueous CuCl$_2$ solution using Pt electrodes liberate Cl$_2$ (g) at anode
III. Lead storage battery is a secondary battery
Identify the incorrect match
Elements A and B form two non-volatile compounds (AB$_2$ and AB$_4$). When 1 g of AB$_2$ is added to 20 g of C$_6$H$_6$ (molar mass =78 gmol$^{-1}$) the freezing point of C$_6$H$_6$ is lowered by 2.3 K. When 1 g of AB$_4$ is added to 20 g of C$_6$H$_6$, the freezing point of C$_6$H$_6$ was lowered by 1.3 K. The atomic masses of A and B are respectively (K$_f$(C$_6$H$_6$)=5.1 K kg mol$^{-1}$)
An isomer of C$_8$H$_{18}$ is X. This has five primary, one tertiary and one quaternary carbon. What is X?
Consider the following statements
Statement I: Benzene undergoes electrophilic substitution with excess chlorine in the presence of anhydrous AlCl$_3$
Statement - II: Benzene also undergoes electrophilic substitution with chlorine in the presence of UV light.
The correct answer is
Consider the following statements
Statement-I: Oxides of sulphur and nitrogen are air pollutants
Statement-II: Photochemical smog is a reducing smog
The correct answer is
NaCl is crystallized in the presence of small quantity of SrCl$_2$. The formula of crystallized solid is Na$_{0.9998}$Sr$_{0.0001}$Cl. The number of cationic vacancies per mole of this solid is (N=6$\times10^{23}$ mol$^{-1}$)
What are X and Y in the following reaction sequence?
2-Methylbutane $\xrightarrow{\text{KMnO}_4}$ X$\xrightarrow{\text{Y}}$ C5H11Cl
Identify the chain isomers from the following
Identify the correct statements
I. Lithium halides are somewhat covalent in nature
II. NaNO$_3$ on heating gives NO$_2$ gas
III. LiHCO$_3$ is a solid
IV. All alkali metals form ethynides on reaction with ethyne
The correct order of atomic radii of Al, Ga, In, Tl is
Which of the following compounds are correctly matched with their uses?
Which of the following set of Oxides is not correctly matched?
Identify the correct statements from the following
I. In CuSO$_4\cdot5$H$_2$O, only one molecule of H$_2$O is hydrogen bonded.
II. In BaCl$_2\cdot2$H$_2$O, water is in interstitial positions
III. In CrCl$_3\cdot6$H$_2$O, only three H$_2$O molecules form coordinate bonds with Cr$^{3+}$
In long form of periodic table an element 'X' is present in group 'Y' in which Mn is also an element. X, Y respectively are
At T(K) 10 L of an ideal gas was expanded to 12 L against a pressure of 2 atm irreversibly. What is the work done by the gas?
Identify the number of metalloids from the following: Sb, Be, P, Ge, Te, S, Cs, Tc, I
The slope of isobar of one mole of an ideal gas at p (atm) is 0.082 L K$^{-1}$. What is the value of p in atm? (R=0.082 L atm mol$^{-1}$K$^{-1}$)
Reagents and compound to convert ethyl bromide → 2-butanone:
An amine X (C4H11N) on heating with CHCl3 in ethanolic KOH forms a foul-smelling substance. Product of other amine Y (C4H11N) and benzenesulphonyl chloride is insoluble in alkali. What are X and Y respectively?
X and Y in reactions:
Isopentyl alcohol reacts with reagent X → carboxylic acid → decarboxylation → Y. Reaction of Y with Z → t-butyl alcohol. Identify X and Z.
What are X and Y in the following reaction sequence?