Anyone has the important questions of chemistry class 12th for board exams?? If has then send me fast plz answer gonna brainlist plz guys help me
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Question: How is Brownian movement responsible for the stability of sols?
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:
(CH3)2C=CHCOCH3
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.
Write the IUPAC name of the following compound: (CH3)3 CCH2Br.
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.
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:
(CH3)2C=CHCOCH3
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.
Write the IUPAC name of the following compound: (CH3)3 CCH2Br.
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.
: 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.
: Give the equation of reaction for the preparation of phenol from cumene.
: Name the type of semiconductor obtained when silicon is doped with boron.
: 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.
: 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.
: 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.
: 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?
: What are n-type semiconductors?
: What is the basicity of H3PO2 acid and why?
.
: How may the conductivity of an intrinsic semiconductor be increased?
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