List of top Questions asked in Maharashtra Board Class XII Exam

Explain the term Emigration.
What are the reasons for the success of Mendel?
Arrange the following steps of DNA fingerprinting in correct sequence :

Gel electrophoresis
Isolation of DNA
Southern blotting
Restriction digestion
Which of the following is caused by unsterilized needle?
Recognition sequence of restriction enzymes are generally ______________ nucleotides long.
Which of the following types require pollinator but result is genetically similar to autogamy?
Which one of the following does not evolve further?
Identify the appropriate term for the number of births under ideal conditions :
Observe the graph and select correct option :
State whether entropy change is positive or negative in the following examples : (i) Melting of ice (ii) Vaporisation of a liquid Explain ‘common ion effect’ with example.
Draw a neat and labelled diagram of a lead accumulator cell. Write the overall reactions taking place at cathode and anode during discharging of the cell.
Define a unit cell. Which colour is shown by NaCl crystal due to formation of F-centre? Why does fluorine show anomalous behaviour in ‘17 group’ elements?
Identify the growth hormone in plants which causes inhibitory effect.
Which one of the following is not a part of lac operon?
In absence of fertilization, corpus luteum degenerates into ____________.
Which of the following divides nasal cavity?
Write the formula to calculate EAN. Explain formation of [CO(NH\(_3\))\(_6\)]\(^{3+}\) complex ion with respect to : (i) Type of hybridisation (ii) Magnetic property
Calculate spin only magnetic moment of M\(^{2+}\) ion. [atomic number of M = 26] Write condensed electronic configuration of Gadolinium [Z = 64].
Write the reducing agents used to convert Fe\(_2\)O\(_3\) to ‘Fe’ in the reduction zone of blast furnace. Write chemical equations involved in : (i) Carbylamine reaction for ethylamine. (ii) Hoffmann Bromamide degradation for acetamide.
Explain Cannizzaro’s reaction with the help of benzaldehyde. Write the reaction for the conversion of cyclohexene to adipic acid.
Define zero order reaction. A reaction takes place in two steps : (i) NO(g) + Cl\(_2\)(g) \( \rightarrow \) NOCl\(_2\)(g) (ii) NOCl\(_2\)(g) + NO(g) \( \rightarrow \) 2NOCl(g). Write the overall reaction and identify the reaction intermediate.
\( \Delta \)H for formation of ethane gas is \( -84.4 \) kJ at 300 K. Calculate \( \Delta \)U for the reaction.
Mention the types of polymers formed on the basis of intermolecular forces. Write any two uses of low density polyethylene.
An element with molar mass 27 g/mol forms a cubic unit cell with edge length 405 pm. If density of the crystal is g cm\(^{-3}\), identify the type of unit cell. Derive the equation of Raoult’s law for binary solution containing non-volatile solute.
How many coulombs of electricity is required to produce 1g of sodium metal by reduction of sodium ion?