List of top Chemistry Questions

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 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:

Which of the following reactions can produce aniline as the main product?

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.

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:

Xenon hexafluoride on partial hydrolysis produces compounds 'X' and 'Y'. Compounds 'X', 'Y' and the oxidation state of Xe are respectively:

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 :

The dihedral angle in staggered form of 1,1,1-Trichloro ethane is ________ degree. (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).

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).

Number of Cl=O bonds in chlorous acid, chloric acid and perchloric acid respectively are :

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 :

The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :

If the Thompson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been :

The CORRECT order of first ionisation enthalpy is :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : SO$_2$(g) is adsorbed to a larger extent than H$_2$(g) on activated charcoal.
Reason R : SO$_2$(g) has a higher critical temperature than H$_2$(g).
In the light of the above statements, choose the most appropriate answer from the options given below.

Select the correct statements.
(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solids are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of temperatures.
(E) Amorphous solids have a definite heat of fusion.
Choose the most appropriate answer from the options given below :

The addition of silica during the extraction of copper from its sulphide ore

Consider the above reaction where 6.1 g of Benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The percentage yield of the product is _________. (Round off to the Nearest Integer). [Given : Atomic masses : C : 12.0 u, H : 1.0 u, O : 16.0 u, Br : 80.0 u]