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Chemistry
List of top Chemistry Questions
In the reaction :
$Cl_2 + OH^- \to Cl^- + ClO_4 + H_2O$
Chemistry
Redox reactions
In the reaction
$ {2 Na_2S_2O_3 + I_2 -> Na_2 S_4 O_6 + NaI}$
the oxidation number of sulphur is
Chemistry
Redox reactions
In the preparation of ethyl chloride by Grooves?>[Anhyd.ZnCl_2] CH_2CH_2Cl + H_2O}
$ the main reason for using anhydrous $
{ZnCl_2}$ as catalyst is that
Chemistry
Haloalkanes and Haloarenes
In the preparation of compounds of
$Xe$
, Bartlett had taken
$O^+_2\, PtF_6^-$
as a base compound. This is because
Chemistry
p -Block Elements
In the presence of oxygen, removal of sulphur from the ore is done in
Chemistry
General Principles and Processes of Isolation of Elements
In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?
Chemistry
Classification of elements and periodicity in properties
In the metallic crystal
Chemistry
Chemical bonding and molecular structure
In the manufacture of safety matches we use
Chemistry
p -Block Elements
In the given reaction :
$ {CH3CH2OH ->[KMnO_4][H^+] A }$
$ { ->[B][H_2SO_4 /heat] CH3COOCH2CH3}$
A and B are
Chemistry
Alcohols, Phenols and Ethers
In the given graph, a periodic property
$(R)$
is plotted against atomic numbers
$(Z)$
of the elements. Which property is shown in the graph and how it is correlated with reactivity of the elements?
Chemistry
Classification of elements and periodicity in properties
In the Frasch process, molten sulphur rises up from the
Chemistry
Concentration of ores
In the following sets of reactants which two sets best exhibit the amphoteric characters of
$ {Al_2O_3. xH_2O}$
? Set 1:
$ {Al2O3.xH2O (s)}$
and
$ {OH- (aq)}$
Set 2:
$ {Al2O3.xH2O (s)}$
and
$ {H2O (l)}$
Set 3:
$ {Al2O3.xH2O (s)}$
and
$ {H+ (aq)}$
Set 4:
$ {Al2O3.xH2O (s)}$
and
$ {NH3 (aq)}$
Chemistry
p -Block Elements
In the following reaction :
$ {Acetamide ->[P_2O_5][\Delta] Y ->[H_2O/HCl][\Delta] Z ->[NaOH][CaO] CH_4 }$
, identify Z :
Chemistry
Amines
In the following reaction,
$C_6H_5COOCH_3\xrightarrow[H_2O/H^+]{LiAlH_4}A+B$
A and Bare respectively
Chemistry
Aldehydes, Ketones and Carboxylic Acids
In the first transition series, the element which shows highest oxidation state has the electronic configuration
Chemistry
d -and f -Block Elements
In the following chemical reaction:
$ {Ag_2O + H_2O + 2e^{-} -> 2Ag + 2OH^{-}} $
Chemistry
Redox reactions
In the following decomposition reaction
$ {2H_2O ->[\Delta] 2 H_2 + O_2}$
Chemistry
Redox reactions
In the following compounds The order of acidity is
Chemistry
Alcohols, Phenols and Ethers
In the extraction of aluminium from bauxite, cryolite is used to
Chemistry
General Principles and Processes of Isolation of Elements
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:
Chemistry
General Principles and Processes of Isolation of Elements
In the electrolysis of dilute
$H_2SO_4$
using platinum electrode
Chemistry
Electrochemistry
In the disproportionation reaction
$ {3 \, HClO_3 -> HClO_4 + Cl_2 + 2 O_2 + H_2O}$
the equivalent mass of the oxidising agent is (molar mass of
$ {HClO_3 = 84.45}$
)
Chemistry
Redox reactions
In the cubic close packing, the unit cell has
Chemistry
The solid state
In the coordination compound
$K_4[Ni(CN)_4]$
, the oxidation state of nickel is
Chemistry
coordination compounds
In the complex
$[Pt(py)_4] [PtCl_4]$
, the oxidation numbers of Pt atom in former and later part of the compound are respectively
Chemistry
coordination compounds
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