List of top Chemistry Questions

What is the molarity of a solution prepared by dissolving 8.0 g of NaOH in enough water to make 2.0 L of solution? (Molar mass of NaOH = 40 g/mol)
What is the molecular formula of a compound that has the empirical formula \( \text{CH}_2\text{O} \) and a molar mass of 90 g/mol?
What is the number of moles of oxygen atoms in 4.0 g of \( \text{O}_2 \)?

Match the following: 

Assertion (A): Cu cannot liberate \( H_2 \) on reaction with dilute mineral acids. Reason (R): Cu has positive electrode potential.
Write the reaction of D-Glucose with the following:
(a) HCN (b) Br$_2$ water (c) (CH$_3$CO)$_2$O
If \(N_2\) gas is bubbled through water at 293 K, how many moles of \(N_2\) gas would dissolve in 1 litre of water? Assume that \(N_2\) exerts a partial pressure of 0.987 bar. [Given \(K_H\) for \(N_2\) at 293 K is 76.48 K bar]
Out of KMnO$_4$ and K$_2$MnO$_4$, which one is paramagnetic and why?
Why is the ability of oxygen greater than fluorine to stabilise higher oxidation states of transition metals?
How do you prepare potassium manganate from pyrolusite ore?
Why is molecularity applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?
Assertion (A): Vitamin C cannot be stored in our body.
Reason (R): Vitamin C is water soluble and excreted in urine.
Why can azeotropic mixture not be separated by fractional distillation?
Write two differences between DNA and RNA.
Deficiency of vitamin B$_1$ causes the disease :
Assertion (A): Aquatic species are more comfortable in cold water than in warm water.
Reason (R): Solubility of oxygen gas in water decreases with increase in temperature.
Assertion (A): First ionisation enthalpy of Cr is lower than that of Zn.
Reason (R): Zinc is a non-transition element.
Anilinium hydrogen sulphate on heating at 453–473 K produces which of the following as a major product ?

Which of the following amines does not give foul smell of isocyanide on heating with chloroform and ethanolic KOH ?

The reaction

suggests that phenol is :

Which of the following aqueous solutions will have the highest osmotic pressure ?
A conductivity cell usually consists of two :
Which of the following is the slope of the first order reaction in the plot of ln[R] vs. time ?
Which of the following haloalkanes is most reactive towards S$_N$2 reaction ?
An organic compound (X) having molecular formula C$_5$H$_{10$O can show various properties depending on its structures. Draw each of the structures if it :
shows Cannizzaro reaction.