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12th Std Chemistry Describe the following:(i) Acetylation (ii) Cannizzaro reaction (iii) aldol condensation (iv) Decarboxylation (v) Diazotisation

12th Std Chemistry Why does nitrogen show catenation properties less than phosphorus?

12th Std Chemistry Why are halogens strong oxidising agents?

12th Std Chemistry How are XeO3 and XeOF4 prepared?

12th Std Chemistry Write balanced equations when NaCl is heated with sulphuric acid in the presence of MnO3

12th Std Chemistry Give the disproportionation reaction of H3PO3.

12th Std Chemistry [i] What do you understand by the term glycosidic linkage? [ii] What is glycogen? How is it different from starch? [iii] What are the hydrolysis products of (i) sucrose and (ii) lactose

12th Std Chemistry Distinguish by a chemical test – (a) Acetaldehyde and acetone (b) Methyl amine and dimethyl amine (c) Phenol and benzoic acid.

12th Std Chemistry What happens when ethanol is heated with sulphuric acid at 413 K.? Explain mechanism of the reaction ?

12th Std Chemistry Why do noble gases have comparatively large atomic sizes?

12th Std Chemistry Why is dioxygen a gas but sulphur a solid?

12th Std Chemistry Why does R3P = O exist but R3N = O does not ?

12th Std Chemistry Explain: (i) Zone refining (ii) Column chromatography

12th Std Chemistry Discuss briefly giving an example the role of coordination compounds in biological systems

12th Std Chemistry What is spectrochemical series?

12th Std Chemistry write the formula for the Tetrahydroxozincate(II)

12th Std Chemistry Conductivity of 0.00241 M acetic acid is 7.896 × 10–5 S cm–1. Calculate its molar conductivity and if for acetic acid is 390.5 S cm2 mol–1, what is its dissociation constant?

12th Std Chemistry Calculate the mass of a non-volatile solute (molar mass 40 g mol–1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%

12th Std Chemistry What is meant by the term ‘broad spectrum antibiotics’ ? Explain.?

12th Std Chemistry Explain the term copolymerisation and give two examples?

12th Std Chemistry [NiCl4]2– is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why?

12th Std Chemistry Convert- (a) 2-Chlorobutane to 3, 4-dimethylhexane (b) 2-Methyl-1-propene to 2-chloro-2-methylpropane

12th Std Chemistry Explain the following about the transition elements- (a) Paramagnetic nature (b) Complex formation

12th Std Chemistry Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

12th Std Chemistry State Henry’s law and mention some important applications

12th Std Chemistry Silver forms ccp lattice and X-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u)

12th Std Chemistry Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it

12th Std Chemistry What are the advantage of artificial sweeteners ?

12th Std Chemistry Write the formula of the monomer used in the coating of non-stick cook wares ?

12th Std Chemistry What are essential amino acids ?

12th Std Chemistry Why aniline is less basic than ammonia ?

12th Std Chemistry Draw structure of 3-methyl pentanal.

12th Std Chemistry Write IUPAC name of CH3 –C( CH3 )2 –CH (Br ) –CH2OH

12th Std Chemistry Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionization isomers

12th Std Chemistry Why is adsorption always exothermic ?

12th Std Electronics Derive an expression for total power carried by an AM wave

12th Std Electronics What is full adder? Construct the full adder using half adders. Write its output, when the inputs are A=1,B=1,C=2

12th Std Electronics Derive an expression for the output impedance of a feedback amplifier

12th Std Electronics With help of re model derive an expression for input impedance and voltage gain for a single stage CE amplifier.

12th Std Electronics Draw the pin diagram of IC7403

12th Std Electronics Draw the frequency spectrum of AM wave.

12th Std Electronics Define sequential logic circuit.

12th Std Electronics Write the truth table of clocked SR flip flop.

12th Std Electronics Define frequency modulation.

12th Std Electronics Give an expression for the gain when positive feedback is applied to an amplifier.

12th Std Electronics What is the effect of negative feedback on the band width of an amplifier?

12th Std Electronics How do you bias a transistor to operate in active region?

12th Std Electronics Write the relationship between the three currents in the transistors.

12th Std Electronics With a help of circuit diagram explain switching action of a transistor,

12th Std Electronics Write the neat diagram of two stages RC coupled amplifier and explain its working, also mention its applications.

12th Std Electronics Explain the construction, working and applications of photo transistor.

12th Std Electronics Give a comparison of CE, CB and CC amplifier.

12th Std Electronics Give the classifications of transistor amplifier.

12th Std Electronics With a circuit diagram, explain the operation of a CC amplifierWhy is it preferred as impedance matching circuit?

12th Std Electronics Mention the advantages, disadvantages and application of a Direct coupled Amplifier.

12th Std Electronics What is an opt coupler? Write its circuit construction.

12th Std Electronics Explain the frequency response of a single CE amplifier

12th Std Electronics Explain the function of coupling capacitors and emitter by pass capacitor in CE Amplifier.

12th Std Electronics Mention the advantages of an RC coupled amplifier.

12th Std Electronics Draw the characteristics of phototransistor.

12th Std Electronics ACE –Amplifier has an output resistance of 5 KO and voltage gain of 100. If the input signal voltage is 5 m V: find the Base current given ß of transistor is 50 .

12th Std Electronics Mention the steps involved in writing a.c equivalent circuit.

12th Std Electronics Why CB amplifier is seldom used in AF amplifier

12th Std Electronics Define Bandwidth of an amplifier

12th Std Electronics Name any two advantages of expressing gain in decibel

12th Std Electronics why is the CC amplifier called an emitter follower?

12th Std Electronics Draw the ac equivalent circuit of a CB amplifier

12th Std Electronics Mention the steps involved to obtain d.c equivalent circuit of CE amplifier

12th Std Electronics what is cascaded amplifier?

12th Std Electronics what is the effect on gain of an amplifier if the emitter by pass Capacitor is opened?

12th Std Electronics Define input impedance.

12th Std Electronics What is meant by faithful amplification?

12th Std Electronics How does capacitor appear in dc equivalent circuit?

12th Std Electronics What is meant by dark current? Give the expression for the same.

12th Std Electronics What is the phase difference between input and output signals in a CB amplifier?

12th Std Electronics Which transistor configuration produce s 180° phase shift?

12th Std Electronics Name the transistor amplifier which has unity voltage gain

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