List of top Questions asked in CBSE CLASS XII

Assertion (A): [Cr(H$_2$O)$_6$]Cl$_2$ and [Fe(H$_2$O)$_6$]Cl$_2$ are examples of homoleptic complexes.
Reason (R): All the ligands attached to the metal are the same.
An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because __________
The best reagent for converting propanamide into propanamine is:
The acid formed when propyl magnesium bromide is treated with CO$_2$ followed by acid hydrolysis is:
Alkyl halides undergoing nucleophilic bimolecular substitution reaction involve:
The correct IUPAC name of [Pt(NH$_3$)$_2$Cl$_2$]$^{2+} $ is:
Acidified KMnO$_4$ oxidizes sulphite to:
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr$^{3+}$ ion (Atomic no. : Cr = 24) is:
Standard electrode potential for Sn$^{4+}$/Sn$^{2+}$ couple is +0.15 V and that for the Cr$^{3+}$/Cr couple is -0.74 V. The two couples in their standard states are connected to make a cell. The cell potential will be:
Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of the OH group attached to the benzene ring. Since the OH group increases the electron density more to the ortho- and para- positions, one of the examples of the aldehyde group being introduced on the aromatic ring of phenol, ortho to the hydroxyl group. This is a general method used for the ortho-formylation of phenols.
Answer the following questions:
Read the passage carefully and answer the questions that follow.
Passage: The rate of a chemical reaction is expressed either in terms of decrease in the concentration of reactants or increase in the concentration of a product per unit time. Rate of the reaction depends upon the nature of reactants, concentration of reactants, temperature, presence of catalyst, surface area of the reactants and presence of light. Rate of reaction is directly related to the concentration of reactant. Rate law states that the rate of reaction depends upon the concentration terms on which the rate of reaction actually depends, as observed experimentally. The sum of powers of the concentration of the reactants in the Rate law expression is called order of reaction while the number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called molecularity of the reaction.
 Answer the following questions:
The elements of 3d transition series are given as: Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn
Answer the following:
Write in detail the procedure and scoring of 'Flamingo Balance Test' and 'Plate Taping Test' recommended for the age group 5 – 8 years by SAI (Sports Authority of India).
What do you understand by circuit training? How a coach will plan circuit training sessions with 6 stations to develop fitness of his new trainees?
Describe the procedure and benefits of Mandukasana and Makrasana to control hypertension.
Compare and contrast the hostile and instrumental aggression.
Describe the following:
(a) Residual Volume:
(b) Stroke Volume:
Mention any three importance of diet during competition.
Define flexibility. Explain the methods to improve flexibility for a gymnast.
Describe the physical and psychological benefits of women’s participation in sports.
“The organization of community sports reflects the progress of any country.” In the context of this statement, outline ‘Run for a specific cause’ and ‘Run for unity’.
When wrestlers fall on the mat, why do they spread their arms, knees, and legs? Justify your answer.
Enumerate any two myths related to food items with their respective facts.
Suggest any two corrective measures for each, bow legs and round shoulders.
In which type of exercises can movement NOT be seen directly?