List of top Chemistry Questions

Which of the following structures represents thymine?

A major component of Borsch reagent is obtained by reacting hydrazine hydrate with which of the following ?

Compound $( A ), C_8H_9Br$ gives a white precipitate when warmed with alcoholic $AgNO_3$. Oxidation of $(A)$ gives an acid $(B)$, $C_8H_6O$ 4. $(B)$ easily forms anhydride on heating. Identify the compound $(A)$.

Formaldehyde can be distinguished from acetaldehyde by the use of :

Monocarboxylic acids are functional isomers of:

Glycosidic linkage is actually an :

Natural glucose is termed D-glucose because :

The order of reactivity of the given haloalkanes towards nucleophile is :

Which has trigonal bipyramidal shape ?

$XeO_4$ molecule is tetrahedral having :

Which of the following is the wrong statement?

The rate constant of a zero order reaction is $2.0 \times 10^{-2}\, mol \,L^{-1}\, s^{-1}$. If the concentration of the reactant after $25$ seconds is $0.5\,M$. What is the initial concentration ?

What is the EAN of \( [\text{Al}(\text{C}_4\text{O}_4)_3]^{3-} \)?

Which of these ions is expected to be coloured in aqueous solution?

Which of the following ligands is tetradentate?

Match the following and choose the correct option given below. Compound/Type \quad Use A. Dry ice 1. Anti-knocking compound B. Semiconductor 2. Electronic diode or triode C. Solder 3. Joining circuits D. TEL 4. Refrigerant for preserving food

What is the degeneracy of the level of H-atom that has energy \( \frac{R_H}{9} \)?

\( \text{CH}_3\text{CH}_2\text{CH}_2\text{COCH}_3 \) reacts with \( \text{CH}_3 \text{MgBr} \) (one mole) followed by treatment with \( \text{H}_2 \text{O} \). The compound \( A \) formed in this reaction is

The reaction of zinc with \( \text{Cu}^{2+} \) produces the following. Entropy change \( \Delta S \) is given by \( 96.5 J \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \).

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, \( n = 4 \) to \( n = 2 \) of He\(^+\) spectrum?

Consider the following reaction:

An organic compound \( B \) is formed by the reaction of ethyl magnesium iodide with a substance \( A \), followed by treatment with dilute aqueous acid. Compound \( B \) does not react with PCC or PDC in dichloromethane. Which of the following is a possible compound for \( A \)?

For the cell reaction \( 2\text{Cu}^{2+} + \text{Co} \rightarrow 2\text{Co}^{2+} + \text{Cu} \), \( E^\circ_{\text{cell}} \) is 1.89V. If \( E^\circ_{\text{Co}^{2+}/\text{Co}} \) is -0.28V, what is the value of \( E^\circ_{\text{Cu}^{2+}/\text{Cu}} \)?

A constant current of 30 A is passed through an aqueous solution of NaCl for a time of 1.00 h. What is the volume of Cl\(_2\) gas at STP produced?

Select the correct statements(s)