List of top Chemistry Questions

What happens when red blood cells are kept in 0.5\% (mass/vol) NaCl solution? Justify your answer.
For the reaction A + B $\to$ Products, the following initial rates were obtained at various initial concentrations of reactants:
Sl. No.[A] (mol L-1)[B] (mol L-1)Initial rate (mol L-1 s-1)
10.1 0.10.05
20.20.10.10
30.10.20.05
Assertion (A): The boiling points of alkyl halides decrease in the order $R_1>R_3>R_2>R_4$.
Reason (R): The van der Waals forces of attraction decrease in the order $R_1>R_3>R_2>R_4$.
Explain the mechanism of acyl catalytic hydrogenation.
Calculate the elevation of boiling point of a solution when 3 g of CaCl2 (Molar mass = 111 g mol\textsuperscript{-1}) was dissolved in 260 g of water, assuming that CaCl2 undergoes complete dissociation. (Kb for water = 0.52 K kg mol\textsuperscript{-1})
Write the rate law expression for the reaction 2HI → H2 + I2, if the order of the reaction is zero.
What is the effect of temperature on the rate of reaction? Write a mathematical expression for the same.
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
CH3CH2CHO and CH3CH2COOH can be distinguished by:
Assertion (A): Henry’s law constant (KH) decreases with increase in temperature.
Reason (R): As the temperature increases, solubility of gases in liquids decreases.
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.
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.
Which of the following aqueous solutions will have the highest freezing point?
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
Which of the following aldehydes will undergo Cannizzaro reaction?
In which of the following groups are both ions coloured in aqueous solution?
The treatment of ethyl bromide with alcoholic silver nitrite gives:
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?

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.

Which compound gives white precipitate with AgNO$_3$ in ethanol?