List of top Chemistry Questions asked in Maharashtra Class XII

Write unit of rate constant for second order reaction.
Match the correct pair: Column A Column B (i) Glycogen (a) Picric acid
(ii) Sodium benzoate (b) Secondary valency 6
(iii) 2,4,6-trinitrophenol (c) Food preservative
(iv) \(K_4[Fe(CN)_6]\) (d) Half order
(v) Rate = \(K[A]^{3/2}[B]^{-1}\) (e) Animal starch
Substances have zero resistivity or infinite conductivity known as ________.
Write chemical formula of Iron (III) hexacyanidoferrate (II).
Conductivity of a solution increases with dilution. (True/False)
Value of magnetic moment of a divalent ion in aqueous solution having atomic number 25 will be 5.92 B.M. (True/False)
Lower aliphatic amines are soluble in water while higher amines are essentially insoluble in water. (True/False)
Only ________ are obtained on hydrolysis of Protein.
The most common sugar used in our homes is called as glucose. (True/False)
Bromo, iodo and polychloro derivatives of hydrocarbons are heavier than water. (True/False)
Contrary to electrophilic addition reactions observed in alkenes, the aldehydes and ketones undergo nucleophilic addition reactions. (True/False)
Amines behave as ________ due to presence of an unshared pair of electron on Nitrogen atom.
Fuel cells produce electricity with an efficiency of about ________ percentage compared to thermal plants whose efficiency is about 40%.
Zn, Cd and Hg generally are not considered as ________ elements.
All ________ properties of solution are related with decreasing in vapour pressure.
In addition of bromine in \(CCl_4\) to an alkene resulting in disappearance of reddish brown colour of bromine constitutes an important method for the detection of ________ in a molecule.
Write salient features of SN\(^2\) mechanism. What is the action of following reagents on bromomethane : (i) bromobenzene (ii) mercurous fluoride
Identify ‘A’ and ‘B’ in the following reaction and rewrite the complete reaction : \[ \text{CH}_3\text{-CH=CH}_2 \xrightarrow[\text{Peroxide}]{\text{HBr}} \text{A} \xrightarrow[\text{-KBr}]{\text{alcoholic KCN}} \text{B} \]
Write preparation of glucose from sucrose.
What is the action of : (i) Liquid bromine in acetic acid on anisole. (ii) Soda-lime on sodium acetate?
How many coulombs of electricity is required to produce 1g of sodium metal by reduction of sodium ion?
Derive the relation between half life and rate constant for a first order reaction.
What is peptide bond? How is it formed? Write the name and formula of the reagent used to convert alkylhalide to nitroalkane.
Schottky defect is NOT observed in _______.
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?