List of top Questions asked in UP Board XII

Why is it difficult to define a nation?

What is meant by prejudices?

Discuss the impact of liberalization on Indian society.

What are the reasons of higher birth rate in India?

$[NiCl_4]^{2-}$ is paramagnetic while $[Ni(CO)_4]$ is diamagnetic even though both are tetrahedral. Why?

For which of the following ions will the magnetic moment ($\mu$) be maximum?

(A) Write the electronic configuration of the element with atomic number 24.
(B) Find the number of unpaired electrons in $Co^{2+}$ ion.
(C) Why is the range of oxidation states greater in the actinoid series compared to the lanthanoid series?

Write the structures of (A), (B), and (C) in the following reaction:
\[ C_6H_5NO_2 \xrightarrow{Fe/HCl} (A) \xrightarrow[\text{273 K}]{NaNO_2 + HCl} (B) \xrightarrow[\Delta]{H_2O/H^+} (C) \]

Write the structures of (A), (B), and (C) in the following reaction:
Reaction Scheme: \[ (C) \xleftarrow{\text{conc. } HNO_3} \text{Phenol} \xrightarrow{\text{dil. } HNO_3} (A) + (B) \]

What happens when aniline reacts with the following:
(A) Bromine water
(B) $(CH_3CO)_2O$ / Pyridine
(C) $HNO_2 + HCl (0^\circ - 5^\circ C)$

What is a peptide bond? Explain with an example.

Write the mechanism of bimolecular nucleophilic substitution reaction ($S_N2$) of alkyl halide.

Write the IUPAC nomenclature of the following organic compounds:
(A) $CH_3 - CH_2 - \overset{\text{O}}{\overset{||}{\text{C}}} - CH_2 - \underset{\text{CH}_3}{\underset{|}{\text{CH}}} - CH_3$
(B) $Ph - CH = CH - CHO$

Write the definition of electrode potential and cell electromotive force (emf).

Does the half-life of a first-order reaction depend on the initial concentration of the reaction? Explain.

The increasing order of reactivity of the following compounds in $S_N1$ reaction is:
Compounds:
A. $(CH_3)_3CBr$
B. $CH_3CH_2CH_2CH_2Br$
C. $(CH_3)_2CHCH_2Br$
D. $CH_3CH(Br)CH_2CH_3$

If the rate law of a reaction is Rate $= K[A]^2 [B]^0$, then what will be the order of the reaction?

Explain the importance of hygiene in the kitchen and during food preparation.

Describe the types of fibers and their uses in clothing.

Explain the different methods of cooking food with examples.

Write the functions of carbohydrates and fats in the human body.

Define balanced diet. Explain its importance for good health.

Balanced diet means —

Which fiber is obtained from plants?

Which method of cooking preserves maximum nutrients?