List of top Questions asked in UP Board XII

$H_2O$ is a liquid while $H_2S$ is a gas. Why?
Write a short note on primary and secondary structures of proteins.
The crystal system having dimensions $a \neq b \neq c$ and $\alpha = \beta = \gamma = 90^\circ$ is:
The concentration unit independent of temperature is:
The unit of velocity constant for first order reactions is:
Benzyl alcohol is obtained from benzaldehyde by –
Hinsberg’s reagent is –
Which of the following base is not present in DNA?
What is Schottky defect? What is the effect of the presence of Schottky defect on the density of lattice?
Write chemical equation for the preparation of ozone and its three oxidizing properties.
What is Aqua Regia? What happens when aqua regia reacts with (i) Gold, and (ii) Platinum.
Write chemical equations of two methods of preparation of monohydric alcohol and also write chemical equation of the reactions of ethyl alcohol with conc. sulphuric acid (H$_2$SO$_4$) at different temperatures.
Write short notes on the following: (i) Reimer–Tiemann reaction
(ii) Kolbe reaction
How will you obtain the following from Chlorobenzene? (Write only chemical equations) (i) Picric Acid
(ii) Dichlorobenzene
(iii) Chlorobenzene Sulphonic Acid
Write a short note on Nucleophilic substitution reactions in haloalkanes.
Write the chemical equation of the reaction of glucose with bromine water.
Write Nernst equation and its one application.
Differentiate between Lyophilic and Lyophobic colloids.
Write a short note on Acetylation.
Write a short note on denaturation of proteins.
Write four characteristics of transition elements.
Write a short note on IUPAC system of nomenclature of coordination compounds.
How many primary alcoholic groups are present in glucose?
Define packing efficiency.
Write the chemical equation for the reactions of chlorine with (i) sulphur dioxide, and (ii) turpentine oil.