List of top Chemistry Questions asked in UP Board XII

Calculate the electromotive force of the following cell: \[ \text{Cu} | \text{Cu}^{2+} (1M) || \text{Ag}^{+} (1M) | \text{Ag} \] Given \( E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34V \), \( E^\circ_{\text{Ag}^{+}/\text{Ag}} = +0.80V \)

Fehling’s solution is used to identify which type of compounds? Write chemical equations.

Write the color of following metal ions in aqueous solution:

\(pK_b\) value of aniline is more in comparison to that of methyl amine. State the reason.

Write the equation of any one of nucleophilic substitution reactions of ethyl bromide.

Differentiate between double salt and complex salt by giving two examples of each.

Write a note on Tollen’s test.

Which one between 0.1 M Urea and 0.1 M NaCl solution will have greater osmotic pressure? Explain the reason.

Explain the redox potential.

Write the chemical equation for the preparation of phenol.

At what temperature does a 5% (w/v) solution of glucose produce 7 atmospheric osmotic pressure? \([ R = 0.0821 \, \text{L} \cdot \text{atm} / \text{K mol} ]\)

How many primary amines are possible for the formula C$_4$H$_{11}$N?

The oxidation number of Cu in the ion [Cu(CN)$_4$]$^{3-}$ is

5.85 g of NaCl is dissolved in 200 ml water. Calculate the molarity of the solution. [Na = 23, Cl = 35.5]

Rosenmund reduction gives

In comparison to Mn\(^ {3+}\) ions Mn\(^ {2+}\) ions are more stable. Why?

How many primary alcoholic groups are there in glucose?

A colourless ion in the following is

Four alternatives are given in each part of this question. Choose the correct alternative and write it in your answer-book. Number of moles in 180 g of water is:

Appropriate reagent used to distinguish between acetaldehyde and acetone is