List of top Chemistry Questions

The correct formula of hexaammine chromium (III) hexafluoronickelate (II) is

In a system, \(x\,\mathrm{J}\) of heat is absorbed and \(y\,\mathrm{J}\) of work is done by the system. What is \(\Delta U\) (in kJ)?

Given below are two statements Statement--I: The number of water molecules associated with \(\mathrm{LiCl}\), \(\mathrm{NaCl}\), \(\mathrm{CaCl_2}\) are \(2,\ 2,\ 6\) respectively. Statement--II: Both \(\mathrm{LiCl}\) and \(\mathrm{MgCl_2}\) are soluble in ethanol. The correct answer is

Consider the given sequence of reactions

The compound \(D\) cannot be obtained by

Write chemical formula of epsom salt. Give two uses of \( H_2SO_4 \).

Which structure of protein represents its constitution?

The bond angle in the most stable form of sulphur at room temperature is

Among the four complex ions given, identify the pair of ions with same spin only magnetic moment value:

An element with molar mass \(M\,kg\,mol^{-1}\) forms a face centred cubic unit cell with edge length 405 pm. If the density is \(2.7\times10^{3}\,kg\,m^{-3}\). What is its molar mass \(M\)? \((N_A=6.0\times10^{23}\,mol^{-1})\)

The rate constant of a reaction is \[ 1.5\,mol^{-3/2}L^{3/2}s^{-1} \] What is the order of this reaction?

The correct statement about an \(S_N1\) reaction is

Which of the following represents the correct structure of 3-Ethyl cyclohexane carbaldehyde?

What is the product Y in the given reaction sequence? \[ CH_3COOH \xrightarrow{\text{(i) } NH_3 \text{ (ii) } \Delta} X \xrightarrow{Br_2/NaOH} Y \]

The ratio of wavenumber of first line of Balmer series and wavenumber of second line of Lyman series of hydrogen atom is:

A student builds a galvanic cell utilizing the reaction \[ Ni(s)+2Ag^+(aq)\rightarrow Ni^{2+}(aq)+2Ag(s) \] \[ E^\circ=1.05V \] At \(25^\circ C\), what could the student do for the cell to generate a potential greater than that of the initial standard cell?

Identify the reactions which give orthoboric acid from the following: \[ \text{I. Acidification of an aqueous solution of borax} \] \[ \text{II. Hydrolysis of diborane} \] \[ \text{III. Hydrolysis of boron trichloride} \]

An organic compound (X) dissolves in dilute NaOH but not in dilute \(NaHCO_3\) solution. X with \(Br_2/H_2O\) gives tribromo derivative. What is X?

Identify the incorrect statement about colloidal solution.

In leaching alumina, concentrated solution of \(X\) and in leaching gold, dilute solution of \(Y\) are used as leaching agents. \(X\) and \(Y\) respectively are

The compound X can be separated from spent-lye in soap industry by using distillation under reduced pressure. What is X?

Which of the following is not a condensation polymer?

Which of the following statement is correct about the balanced equation given below? \[ Cr_2O_7^{2-}(aq)+14H^+(aq)+3S^{2-}(aq) \rightarrow 2Cr^{3+}(aq)+3S(s)+7H_2O(l) \]

Which of the following reagent(s) will convert n-propyl bromide to alkane with same number of carbon atoms? \[ \text{I. } Zn/H^+ \] \[ \text{II. } Na/\text{dry ether} \] \[ \text{III. } (i)\;alc.KOH \quad (ii)\;H_2/Pt \]

Consider the following species: \[ Li_2,\; B_2,\; Be_2,\; C_2,\; O_2,\; O_2^{2-},\; F_2 \] The number of species with bond order value 1 is:

The reaction of chlorine with hot and concentrated NaOH solution gave two chlorine containing products X, Y and \(H_2O\). Oxidation number of chlorine in X and Y is