Central Board of Secondary Education recently published the admit card for the private students the exam will be conducted from 3rd of March for class 12th students it’s too much less time for the students for the preparation of examination important questions in the below articles for the one marks questions basically there are 5 questions in the examination paper for Chemistry with 1 marks so they have to answer in only one line or only one word students have to prepare for the final preparation in a proper way here are some of the important questions are of 1 marks data given below
CBSE chemistry one marks important questions
@: Give the equation of reaction for the preparation of phenol from cumene.
@: Name the type of semiconductor obtained when silicon is doped with boron.
@: Name the non stoichiometric point defect responsible for colour in alkali metal halides.
@: What is shape selective catalysis?
@: Amongst the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields a single monochloride.
@: On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved which forms a blue coloured complex with Cu2+ ion. Identify the gas.
@: How many ions are produced from the complex, [Co(NH3)6]Cl2 in solution?
@: What is meant by the term ‘forbidden zone’ in reference to band theory of solids?
@: Why is the adsorption phenomenon always exothermic?
@: Write the reaction involved in the extraction of silver after the silver ore has been leached with NaCN.
@: Although the H-bonding in hydrogen fluoride is much stronger than that in water, yet water has a much higher boiling point than hydrogen fluoride. Why?
@: What are n-type semiconductors?
@: What is the basicity of H3PO2 acid and why?
@: How may the conductivity of an intrinsic semiconductor be increased?
@: Define ‘peptization’.
@: How is copper extracted from a low grade ore of it?
@: Which is a stronger reducing agent, SbH3 or BiH3, and why?
@: What is meant by ‘doping’ in a semiconductor?
@: What is the role of graphite in the electrometallurgy of aluminium?
@: Which one of PCl4+ and PCl4– is not likely to exist and why?
@: How many atoms are there in one unit cell of a body centred cubic crystal?
@: State Raoult’s law in its general form with respect to solutions.
@: Name the following coordination compound: K3[CrF6].
@: Which will react faster in SN1 displacement, 1-bromobutane or 2-bromobutane, and why?
@: “Crystalline solids are anisotropic in nature.” What does it mean?
@: State Henry’s law about partial pressure of a gas in a mixture.
@: Why is CO a stronger ligand than Cl–?
@: What is meant by an ‘intrinsic semiconductor’?
@: State Henry’s law about partial pressure of a gas in a mixture.
@: What do you understand by ‘denticity of a ligand’?
@: Which will react faster in SN2 displacement, 1-bromopentane or 2-bromopentane, and why?
@: What are lyophobic colloids? Give one example for them.
@: Why is it that only sulphide ores are concentrated by froth floatation process?
@: Define ‘order of a reaction’.
@: What is meant by ‘shape selective catalysis’?
@: Differentiate between a mineral and an ore.
@: What is meant by ‘lanthanoid contraction’?
@: Express the relation among the conductivity of solution in the cell, the cell constant and the resistance of solution in the cell.
@: Draw the structure of BrF3 molecule.
@: In nylon-6, 6 what does the designation ‘6, 6’ mean?
@: ‘Crystalline solids are anisotropic in nature.’ What does this statement mean?
@: Express the relation between conductivity and molar conductivity of a solution held in a cell?
@: Define ‘electrophoresis’
@: Draw the structure of XeF2 molecule.
@: Draw the structure of 3-methylbutanal.
@: Identify the order of reaction for which the rate constant is expressed in units of L–1mol s–1.
@: What is meant by ‘reversible sols’?
@: Give an example of coordination isomerism.
@: What happens when glucose reacts with nitric acid?
@: State a feature to distinguish a metallic solid from an ionic solid.
@: What is the number of atoms in a unit cell of a simple cubic crystal?
@: Identify the order of reaction from the following unit for its rate constant: L mol–1s–1
@: Give an example of shape-selective catalyst.
@: What is an ambidentate ligand? Give an example.
@: What happens when glucose is treated with bromine water?
@: Write a distinguishing feature of metallic solids?
@: Differentiate between molarity and molality of a solution.
@: What are the products of hydrolysis of sucrose?
@: What type of semiconductor is obtained when silicon is doped with arsenic?
@: Nitrogen is relatively inert as compared to phosphorus. Why?
@: What is monosaccharide?
@: What is meant by ‘copolymerisation’?
@: What type of interactions hold the molecules together in a polar molecular solid?
@: What is meant by ‘limiting molar conductivity’?
@: Fluorine does not exhibit any positive oxidation state. Why?
@: Which point defect in its crystal unit cells decreases the density of a solid?
@: What is the number of atoms in a body-centred cubic unit cell of a crystal?
@: What is an emulsion?
@: Which one has higher electron gain enthalpy with negative sign, sulphur or oxygen?
@: Write the structural formula of 3-oxopentanal.
@: Name two metals which occur in nature as oxides.
@: Write the name of an antacid which is often used as a medicine.
@: What is the number of atoms in a unit cell of a face-centred cubic crystal?
@: How do metallic and ionic substances differ in conducting electricity?
@: What is the ‘coagulation’ process?
@: What is meant by the term ‘pyrometallurgy’?
@: Why is red phosphorus less reactive than white phosphorus?
@: Name an element with which silicon may be doped to give a p-type semiconductor.
@: Draw the structure of 2, 6-Dimethylphenl.
@: Write the structural formula of 1-phenylpentan-1-one.
@: Arrange the following compounds in an increasing order of their basic strength in aqueous solutions: NH3, RNH2, R2NH, R3N
@: Write the structure of pent-2-enal
@: Give IUPAC name of the following compound:
@: Write the IUPAC name of the following compound: CH2 = CHCH2Br
@: Draw the structural formula of 2-methylpropan-2-ol molecule.
@: Give the IUPAC name and structure of the amine obtained when 3-chlorobutanamide undergoes Hoffmann bromamide reaction.
@: (CH3)3C‒CHO does not undergo aldol condensation. Comment
@: How is Brownian movement responsible for the stability of sols?
@: In the Arrhenius equation, what does the factor e‒Ea/RT corresponds to?
@: Define Kraft temperature.
@: The electronic configuration of a transition element in +3 oxidation state is [Ar]3d7. Find out its atomic number.
@: Draw the structure of 4-tertbutyl-3-iodoheptane.
@: Draw the structure of the following compound: 4-Bromo-3-methylpent-2-ene
@: Which is a stronger acid in aqueous solution ‒ HCl or HI, and why?
@: Which one of these compounds is more easily hydrolysed by KOH solution and why?
CH3 CHClCH2CH3 or CH3CH2CH2CH2Cl
@: Arrange the following compounds in an increasing order of their solubility in water: C6H5NH2, (C2H5)2NH, C2H5NH2.
Some of the Most VVIPs
@: In the process of wine making, ripened grapes are crushed so that sugar and enzyme should come in contact with each other and fermentation should start. What will happen if anaerobic conditions are not maintained during this process?
@: A coordination compound with molecular formula CrCl3.4H2O precipitates one mole of AgCl with AgNO3 solution. Its molar conductivity is found to be equivalent to two ions. What is the structural formula and name of the compound?
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