List of top Chemistry Questions

Consider the following A) 0.0025 B) 500.0 C) 2.0034 Number of significant figures in A, B and C respectively, are
The pair of molecules / ions with the same bond order value is
The difference between the radii of \(3^{rd}\) and \(2^{nd}\) orbit of H-atom is x pm. The difference between the radii of \(4^{th}\) and \(3^{rd}\) orbit of \( \text{Li}^{2+} \) ion is y pm. \(y:x\) is equal to
The de Broglie wavelength of an electron in the third Bohr orbit of H-atom is
Which of the following are paramagnetic?
A. [NiCl$_4$]$^{2-}$
B. Ni(CO)$_4$
C. [Ni(CN)$_4$]$^{2-}$
D. [Ni(H$_2$O)$_6$]$^{2+}$
E. Ni(PPh$_3$)$_4$
Choose the correct answer from the options given below:

What are X and Y in the following reaction sequence?

The list given below contains essential amino acids that are basic (X) and also non-essential amino acids that are neutral (Y). X and Y, respectively are
a) Lysine
b) Alanine
c) Serine
d) Arginine
e) Tyrosine
Which one of the following halogen compounds is least reactive towards hydrolysis by S$_N$1 mechanism?
The artificial sweetener X contains glycosidic linkage and Y contains amide and ester linkages. X and Y respectively are

Arrange the following in decreasing order of electrophilicity of carbonyl carbon.

What is the ratio of sp$^3$ carbons to sp$^2$ carbons in the product 'P' of the given sequence of reactions?

p-Chlorotoluene is the major product in which of the following reactions?

The final product (C) in the given reaction sequence is

Match the following:
List-I (Glycosidic linkage) 
A. $\alpha$-1,4 
B. $\beta$-1,4 
C. $\alpha$-1,4, $\alpha$-1,6 
List-II (Polysaccharide) 
I. Amylose 
II. Amylopectin 
III. Cellulose

The co-ordination number of chromium in K[Cr(H$_2$O)$_2$(C$_2$O$_4$)$_2$] is
Consider the following:
Statement-I: Nylon 6 is a condensation copolymer.
Statement-II: Nylon 6,6 is a condensation polymer of adipic acid and tetramethylene diamine.
The correct answer is
The number of P=O and P-O-P bonds present in the oxoacid of phosphorus, prepared by treating red P$_4$ with alkali, are respectively

Match the following:
List-I (Process)
A. Hall-Heroult process
B. Mond process
C. Van-Arkel process
D. Zone refining process
List-II (Metal)
I. Ti
II. In
III. Al
IV. Ni

Which one of the following statements is not correct?
In a Freundlich adsorption isotherm, if the slope is unity and k is 0.1, the extent of adsorption at 2 atm is (log 2 = 0.30)
For a first-order reaction, the ratio between the time taken to complete $\frac{3}{4}$th of the reaction and time taken to complete half of the reaction is
An aqueous solution containing 0.2 g of a non-volatile solute 'A' in 21.5 g of water freezes at 272.814 K. If the freezing point of water is 273.16 K, the molar mass (in g mol$^{-1}$) of solute A is [K$_f$(H$_2$O) = 1.86 K kg mol$^{-1}$]
Consider the following cell reaction: 2Fe$^{3+}$(aq) + 2I$^-$ (aq) $\rightarrow$ 2Fe$^{2+}$(aq) + I$_2$(s). At 298 K, the cell emf is 0.237 V. The equilibrium constant for the reaction is 10$^x$. The value of x is (F = 96500 C mol$^{-1}$; R = 8.3 J K$^{-1}$ mol$^{-1}$)
At T(K), the vapor pressure of x molal aqueous solution containing a non-volatile solute is 12.078 kPa. The vapor pressure of pure water at T(K) is 12.3 kPa. What is the value of x?
An element occurs in the body-centred cubic structure with an edge length of 288 pm. The density of the element is 7.2 g cm$^{-3}$. The number of atoms present in 208 g of the element is nearly