List of top Chemistry Questions

The half-life of a reaction is inversely proportional to the square of the initial concentration of the reactant. Then the order of the reaction is:
For the reaction, \[ 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g), \] \[ \Delta H = -57.2 \, \text{kJ/mol} \quad \text{and} \quad K_c = 1.7 \times 10^{16} \] Which of the following statement is INCORRECT?
The total number of possible isomers for square-planar \( \text{[Pt(Cl)(NO}_2)(NO_3)(SCN)]^{2-} \) is:
In which of the following pairs both the ions are coloured in aqueous solutions?
The increasing order for the values of e/m (charge/mass) is:
To deposit 0.634 g of copper by electrolysis of aqueous cupric sulphate solution, the amount of electricity required (in coulombs) is:
Which of the following reactions can produce aniline as the main product?
What is the product of the following reaction?
Hex-3-ynal + (i) NaBH\(_4\), (ii) Pb\(_3\), (iii) Mg/ether, (iv) CO\(_2\)/H\(_2\)O → ?
In the following skew conformation of ethane, the \( H' - C - C - H'' \) dihedral angle is:
In the following sequence of reactions, \[ \text{CH}_3\text{CH}_2\text{OH} \xrightarrow{P_1,2} A \xrightarrow{\text{Mg/ether}} B \xrightarrow{\text{HCHO}} C \xrightarrow{H_2O} D \] The compound D is:
Secondary structure of protein refers to:
Xenon hexafluoride on partial hydrolysis produces compounds 'X' and 'Y'. Compounds 'X', 'Y' and the oxidation state of Xe are respectively:
Consider the following statements: I. Increase in concentration of reactant increases the rate of a zero order reaction. II. Rate constant \( k \) is equal to collision frequency if \( E_a = 0 \). III. Rate constant \( k \) is equal to collision frequency if \( E_a = \infty \). IV. \( \ln k \) vs \( T \) is a straight line. V. \( 1/T \) vs \( \ln k \) is a straight line. Correct statements are:
Consider the following reactions: \[ \text{NaCl} + \text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 (\text{Conc.}) \rightarrow (A) + \text{Side products} \] \[ (B) + \text{H}_2\text{SO}_4 (\text{dilute}) + \text{H}_2\text{O}_2 \rightarrow (C) + \text{Side products} \] The sum of the total number of atoms in one molecule each of (A), (B) and (C) is __________.
The edge length of unit cell of a metal having molecular weight 75 g/mol is 5 Å which crystallizes in cubic lattice. If the density is 2 g/cc, then find the radius of the metal atom. (\( N_A = 6 \times 10^{23} \)) Give the answer in pm.

Given below are two statements : 
Statement I : Penicillin is a bacteriostatic type antibiotic. 
Statement II : The general structure of Penicillin is : 
Choose the correct option : 

 

What is A in the following reaction ? 

Consider the above reaction, and choose the correct statement : 

 

Match List - I with List - II : 

Choose the correct answer from the options given below : 
 

Match List - I with List - II : 

Choose the correct answer from the options given below : 
 

The dihedral angle in staggered form of 1,1,1-Trichloro ethane is ________ degree. (Round off to the Nearest Integer).
The equilibrium constant for the reaction
A(s) $\rightleftharpoons$ M(s) + $\frac{1}{2}$O$_2$(g)
is K$_p$=4. At equilibrium, the partial pressure of O$_2$ is ________ atm. (Round off to the Nearest Integer).
2SO$_2$(g) + O$_2$(g) $\rightarrow$ 2SO$_3$(g)
The above reaction is carried out in a vessel starting with partial pressures P$_{SO_2}$ = 250 m bar, P$_{O_2}$ = 750 m bar and P$_{SO_3}$ = 0 bar. When the reaction is complete, the total pressure in the reaction vessel is ________ m bar. (Round off to the Nearest Integer).
To an aqueous solution containing ions such as Al$^{3+}$, Zn$^{2+}$, Ca$^{2+}$, Fe$^{3+}$, Ni$^{2+}$, Ba$^{2+}$ and Cu$^{2+}$ was added conc. HCl, followed by H$_2$S.
The total number of cations precipitated during this reaction is/are :
Number of Cl=O bonds in chlorous acid, chloric acid and perchloric acid respectively are :