List of top Chemistry Questions

Write the rate law expression for the reaction 2HI → H2 + I2, if the order of the reaction is zero.
Match the type of cell given in Column I with their use given in Column II.
Column I Column II
i. Lead storage celld. Inverter
ii. Mercury cellb. Apollo Space Programme
iii. Dry cellc. Wrist watch 
iv. Fuel cella. Wall clock
Assertion (A): The solubility of aldehydes and ketones in water decreases with increase in size of the alkyl group.
Reason (R): Aldehydes and ketones have dipole-dipole interaction.
CH3CH2CHO and CH3CH2COOH can be distinguished by:
Assertion (A): For measuring resistance of an ionic solution an AC source is used.
Reason (R): Concentration of ionic solution will change if DC source is used.
While doing qualitative analysis in chemistry lab, Abhishek added yellow coloured potassium chromate solution into a test tube. He was surprised to see the colour of the solution changing immediately to orange. He realised that the test tube was not clean and contained a few drops of some liquid. Which of the following substances will be the most likely liquid to be present in the test tube before adding potassium chromate solution?
Assertion (A): Henry’s law constant (KH) decreases with increase in temperature.
Reason (R): As the temperature increases, solubility of gases in liquids decreases.
Which of the following aqueous solutions will have the highest freezing point?
Which of the following aldehydes will undergo Cannizzaro reaction?
The treatment of ethyl bromide with alcoholic silver nitrite gives:
In which of the following groups are both ions coloured in aqueous solution?
A plot between concentration of reactant [R] and time ‘t’ is shown below. Which of the given order of reaction is indicated by the graph?
concentration of reactant [R] and time
CH3CH2OH can be converted to CH3CHO by :
The IUPAC name for CH3 - CH2 - N(CH3) - CH2 - CH2 - CH3 is :
Which of the following molecules is chiral in nature?
Which of the following has the lowest boiling point?
Which of the following molecules has the highest bond angle?
How many molecules of carbon dioxide are formed when 0.6 g carbon is burnt in air?

The following data were obtained during the first order thermal decomposition of \( \text{N}_2\text{O}_5(g) \) at constant volume:

Assertion (A): Cu cannot liberate \( H_2 \) on reaction with dilute mineral acids. 
Reason (R): Cu has positive electrode potential.

Consider the following elements In, Tl, Al, Pb, and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are:
Which compound gives white precipitate with AgNO$_3$ in ethanol?
Which of the following shows resonance but not hyperconjugation?
Which of the following reagents is used in Rosenmund reduction?
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)