List of top Chemistry Questions

The de Broglie wavelength of an electron in the third Bohr orbit of H-atom 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

What are X and Y in the following reaction sequence?

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

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

The artificial sweetener X contains glycosidic linkage and Y contains amide and ester linkages. X and Y respectively are
Which one of the following halogen compounds is least reactive towards hydrolysis by S$_N$1 mechanism?

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

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

Which one of the following statements is not correct?
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

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 co-ordination number of chromium in K[Cr(H$_2$O)$_2$(C$_2$O$_4$)$_2$] is
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)
What is the indicator used in Argentometric titrations?
Which one of the following statements related to photochemical smog is not correct?
An alcohol X(C$_4$H$_{10}$O) on dehydration gave alkene (C$_4$H$_8$) as major product, which on bromination followed by treatment with Y gave alkyne C$_4$H$_6$. Alkyne C$_4$H$_6$ does not react with sodium metal. What are X and Y?
Identify the incorrect statement about silica.
Which of the following is not associated with water molecules?
Consider the following:
Statement-I: Both BeSO$_4$ and MgSO$_4$ are readily soluble in water.
Statement-II: Among the nitrates of alkaline earth metals, only Be(NO$_3$)$_2$ on strong heating gives its oxide, NO$_2$, and O$_2$.
The correct answer is
At 27$^{\circ}$C, 1 L of H$_2$ with a pressure of 1 bar is mixed with 2 L of O$_2$ with a pressure of 2 bar in a 10 L flask. What is the pressure exerted by gaseous mixture in bar? (Assume H$_2$ and O$_2$ as ideal gases)
Observe the following molecules/ions. NH$_4^+$, NH$_3$, BF$_3$, OH$^-$, CH$_3^-$, H$^+$, CO, C$_2$H$_4$. The number of Lewis bases in the above list is
Observe the following reactions (g = gas):
I. N$_2$(g) + 3H$_2$(g) $\xrightarrow[\text{200 atm}]{\text{773K, X}}$ 2NH$_3$(g)
II. CO(g) + H$_2$O(g) $\xrightarrow[\text{673 K}]{\text{Y}}$ CO$_2$(g) + H$_2$(g)
III. CH$_4$(g) + H$_2$O(g) $\xrightarrow[\text{1270 K}]{\text{Z}}$ CO(g) + 3H$_2$(g)
Catalysts X, Y, Z respectively are
The number of molecules having lone pair of electrons on central atom in the following is: BF$_3$, SF$_4$, SiCl$_4$, XeF$_4$, NCl$_3$, XeF$_6$, PCl$_5$, HgCl$_2$, SnCl$_2$