Chemistry
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New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i), (ii) and (iii)
Ionic hydrides are crystalline, non-volatile and non-conducting in solid state
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (iv)
All elements in group 13 are Lewis acids because they form electron-deficient compounds. Excess electrons are found as lone pairs in electron-rich hydrides.
These compounds are made up of elements from groups 15-17. (NH3 has one lone pair, H2O has two, and HF has three.) As a result, they act as Lewis bases.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (ii) and (iii)
Electron precise hydrides have the required number of electrons to write their conventional Lewis structures. All elements of group 14 form such compounds (e.g., CH4) which are tetrahedral in geometry.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (ii)
Presence of calcium and magnesium salts in the form of hydrogen carbonate, chloride and sulphate in water makes water 'hard'.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii) and (iv)
The presence of extensive hydrogen bonding between water molecules gives it remarkable features in the condensed phase (liquid and solid phases). In comparison to H2S and H2Se, this results in a high freezing point, high boiling point, high heat of vaporisation, and high heat of fusion.
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (ii)
When an electron is removed from a hydrogen atom, the nucleus decreases to 1.5 * 10-3 pm in size. When compared to usual atomic and ionic sizes of 50 to 200 pm, this is exceedingly small. As a result, H+ does not exist independently and is always bound to other atoms or molecules.
New answer posted
a year agoContributor-Level 10
1. When benzene is treated with Br2 In presence of ferric bromide (brominating agent) they form bromobenzene. When bromobenzene is treated with Mg in ether it will form Grignard reagent, and if the CO2 is treated with Grignard reagent (in acidic condition) it will form benzoic acid. After esterification reaction in presence of methanol it will form methyl benzoate.
2. When benzene is treated with Br2 In presence of ferric bromide (brominating agent) they form bromobenzene. When bromobenzene is treated with Mg in ether it will form Grignard reagent, and if the CO2 is treated with Grignard reagent (in acidic condition) it will f
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (iii)
Heavy water is utilised as a moderator in nuclear reactors and exchange reactions, and it is more associated with water due to its higher mass.
New answer posted
a year agoContributor-Level 10
a )Tollen's test –Due to oxidizing nature of aldehydes they get easily oxidized, wheareas in case of ketones they are not readily
oxidizable. And tollens test exploits this fact, [Ag (NH3)2]+ is used as reagent Ag mirror is formed during this reaction
b) fehling test- aldehyde reduces the fehling solution to form red brow precipitate of Cu2O. Fehling's solution is a chemical reagent used to differentiate between water-soluble carbohydrate and ketone functiona groups, and as a test for reducing sugars and non-reducing sugars, supplementary to the Tollens' reagent test.
2. Iodoform te
New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (ii)
The combination of CO and H2 is known as water gas. This mixture of CO and H2 is also known as synthesis gas or 'syngas' since it is used to make methanol and other hydrocarbons.
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