List of top Chemistry Questions asked in CBSE Compartment Exam Class XII

For a chemical reaction A \(\rightarrow\) B, it was observed that the rate of reaction doubles when the concentration of A is increased four times. The order of the reaction is:

Considering the strength of the ligand, the highest excitation energy will be observed in:

The correct IUPAC name of \((\text{CH}_3)_3\text{C–CH}_2\text{Br}\) is:

Which of the following does not undergo aldol condensation?

If amines are arranged in increasing order of their basic strength in gaseous phase, the correct order will be:

The geometry of diamagnetic nickel complex \([ \text{Ni(CN)}_4 ]^{2-}\) is:

Out of Fe\(^{2+}\), Co\(^{2+}\), Cr\(^{3+}\), Ni\(^{2+}\), the one which shows highest magnetic moment is:

The most stable complex among the following is:

The standard electrode potential for Sn\(^{4+}\)/Sn\(^{2+}\) couple is \(+0.15\ \text{V}\) and for Cu\(^{2+}\)/Cu couple is \(+0.73\ \text{V}\). These two couples are connected to make an electrochemical cell. The redox reaction is spontaneous. The cell potential will be:

Calculate the molality of a solution prepared by dissolving 5 g of NaOH in 450 g of water. (Molar mass of NaOH = 40 g/mol)

Calculate the packing efficiency in a face-centered cubic (FCC) crystal.

Write the IUPAC name of the compound: \[ \text{CH}_3-CH_2-CH(CH_3)-CH_2-CH_2-CH_3 \]

Write balanced chemical equations for the following:
(a) Reaction of white phosphorus with chlorine
(b) Reaction of orthophosphoric acid on heating

Calculate the EMF of the cell:
Zn(s) | Zn\(^{2+}\) (0.1 M) || Cu\(^{2+}\) (1.0 M) | Cu(s)
Given: \( E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76\,V \), \( E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34\,V \)