List of top Chemistry Questions

10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The solution in this flask is :
Give the structures of A, B, and C in the following reaction sequences: (i)\; \(\mathrm{CH_3CH_2I} \xrightarrow[\ ]{\mathrm{NaCN}} A \xrightarrow[\ ]{\;\;HO^-\;/\;H_2O\;\;} B \xrightarrow[\;Br_2/NaOH\;]{} C\)
(ii)\; \(\mathrm{C_6H_5N_2^+Cl^-} \xrightarrow[\ ]{\mathrm{CuCN}} A \xrightarrow[\ ]{\;H_3O^+\;} B \xrightarrow[\ \Delta\ ]{\;NH_3\;} C\)
(iii)\; \(\mathrm{CH_3CH_2Br} \xrightarrow[\ ]{\mathrm{KCN}} A \xrightarrow[\ ]{\mathrm{LiAlH_4}} B \xrightarrow[\;273\,K\;]{\;HNO_2\;} C\)
Arrange the following in the increasing order of oxidation number of nitrogen
A. N$_2$O
B. NO$_3^-$
C. NO
D. NO$_2$
What is the oxidation state of chromium in K₂Cr₂O₇?
Which of the following is not a colligative property?
What is the pH of a solution with [H\(^+\)] = 10\(^{-3}\) M?
Which of the following is a non-metal?
What is the major product of the reaction of an alkene with bromine water?
Which of the following elements has the highest electronegativity?
What is the molecular geometry of the water molecule (H₂O)?
The work done by a gas during an isothermal expansion from 2 L to 4 L at a constant temperature, with pressure initially at 2 atm, is: (Use R = 8.314 J/mol·K, T = 300 K).
The rate of a reaction doubles when the temperature is increased by 10°C. What is the approximate value of the activation energy?
Which of the following substances does not undergo hydrolysis in aqueous solution?
The potential of a large liquid drop when eight liquid drops are combined is 20 V. What is the potential of each single drop?
Calculate the rate constant of a reaction with a given half-life.
A 2 L container holds oxygen gas at 300 K and 2 atm pressure. If the temperature is increased to 600 K and the volume is doubled, what is the final pressure?
What is the IUPAC name of CH\(_3\)CH\(_2\)OH?

Given below are two statements: 
Statement I: 
 will undergo alkaline hydrolysis at a faster rate than

Statement II:
In  intramolecular substitution takes place first by involving lone pair of electrons on nitrogen. 
 

The effect of temperature on the spontaneity of reactions are represented as:  Which of the following is correct?

Why does Vanadium pentoxide (V2O5) act as a catalyst?

The elements of the 3d transition series are given as: Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn. Answer the following:

Copper has an exceptionally positive \( E^\circ_{\text{M}^{2+}/\text{M}} \) value, why?

A certain reaction is 50 complete in 20 minutes at 300 K and the same reaction is 50 complete in 5 minutes at 350 K. Calculate the activation energy if it is a first order reaction.
Given: \[ R = 8.314 \, \text{J K}^{-1} \, \text{mol}^{-1}, \quad \log 4 = 0.602 \]
Which of the following molecules is chiral in nature?
Why is a solution of Ni(H₂O)₆²⁺ green while a solution of Ni(CN)₄²⁻ is colourless? (At. No. of Ni = 28)
Observe the graph in the given figure and answer the following questions:
linear relationship between log |R0| and time.

(a) Predict the order of reaction.
(b) What is the slope of the curve?