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Recent questions tagged chemistry
Questions
The electronic configuration of gadolinium is
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
electron-configuration
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following transition metal ions are colourless?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
coloured-and-colourless-ions
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The color of a transition metal complex results from which of the following reasons?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
coloured-and-colourless-ions
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The oxidation state of Ni in $Ni(CO)_4$ is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following statements regarding transition elements is/are incorrect?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
inorganic-chemistry
medium
electron-configuration
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Magnese exhibits oxidation states
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
oxidation-state
general-properties
asked
Jan 29, 2014
by
sreemathi.v
1
answer
How many 'd' electrons are present in $Cr^{+2}$ ion?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
electron-configuration
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The changed name of kurchatovium
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
basics
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The formula for calculating the Highest Oxidation State for a Transition metal can be given as follows: Number of Unpaired d-electrons + Two s-orbital electrons. This is true for all the transition metals except two. Which of the following two?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
medium
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The catalyst used in manufacture of $HNO_3$ is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
inorganic-chemistry
applications
q2
easy
catalytic-properties
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Liquid element(metal) among d-block is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
q1
basics
inorganic-chemistry
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Calcium oxide can be used for drying of
jeemain
chemistry
class11
s-block-elements
unit10
q100
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The thermal stability of $BaCO_3,CaCO_3$ and $MgCO_3$ is
jeemain
chemistry
class11
s-block-elements
unit10
q99
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Metals used in flash photography is
jeemain
chemistry
class11
s-block-elements
unit10
q98
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Gypsum is not chemically similar to
jeemain
chemistry
class11
s-block-elements
unit10
q97
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Alkaline earth metal(s) which does(do) not impact colour to the flame is(are)
jeemain
chemistry
class11
s-block-elements
unit10
q96
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Halides (Cl,Br and I) of alkaline earth metal which cannot be dehydrated by heating is (are)
jeemain
chemistry
class11
s-block-elements
unit10
q95
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Oxalates of alkaline earth metal(s) sparingly soluble in water (is) are
jeemain
chemistry
class11
s-block-elements
unit10
q94
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Alkaline earth metal sulphates which crystallises in hydrated form are
jeemain
chemistry
class11
s-block-elements
unit10
q93
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Slaked lime is obtained when water is added to
jeemain
chemistry
class11
s-block-elements
unit10
q92
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The compound insoluble in acetic acid is :
jeemain
chemistry
class11
s-block-elements
unit10
q91
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The pair of amphoteric hydroxides is :
jeemain
chemistry
class11
s-block-elements
unit10
q90
difficult
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Flame test is not given by
jeemain
chemistry
practical-chemistry
easy
asked
Jan 28, 2014
by
mosymeow_1
1
answer
$[X] + H_2SO_4 \longrightarrow [Y]$ colourless with irritating smell. $[Y] + K_2Cr_2O_7 + H_2SO_4 \longrightarrow$ Green solution. [X] and [Y] are
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
The ion that cannot be precipitated by both $HCl$ and $H_2S$
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Potassium cyanide is used for separating
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
How do we differentiate between $Fe^{3+}$ and $Cr^{3+}$ in groupIII?
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
When a substance 'A' reacts with water, it produces a combustible gas 'B' and a solution of substance 'C' in water. When another substance 'D' reacts with this solution of 'C', it also produces the same gas 'B' on warming but 'D' can produce gas 'B' on reaction with dilute sulphuric acid at room temperature. 'A' imparts a deep golden yelow colour to the smokeless flame of bunsen flame. 'A', 'B' , 'C' & 'D' are respectively
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Three separate samples of a solution of a single salt gave these results. One formed a white ppt. with excess ammonia solution, one formed a white ppt. with dil. NaCl solution and one formed a black ppt. with $H_2S$. The salt could be:
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
The only cations present in a slightly acidic solution are $Fe^{3+}, Zn^{2+}$ and $Cu^{2+}$. The reagent that when added in excess to this solution would identify and separate $Fe^{3+}$ in one step is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
When $K_2Cr_2O_7$ crystals are heated with conc. HCl, the gas evolved is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
A pale green crystalline metal salt $M$ dissolves freely in water. It gives a brown precipitate on addition of aqueous $NaOH$. The metal salt solution also gives a black precipitate on bubbling $H_2S$ in aqueous medium. An aqueous solution of the metal salt decolourises the pink colour of the permanganate solution. The metal in the metal salt solution is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Yellow phosphorous on reaction with $Ca(OH)_2$ gives
jeemain
chemistry
class11
s-block-elements
unit10
q89
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following is the strongest reducing agent?
jeemain
chemistry
class11
s-block-elements
unit10
q88
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The most active metal is
jeemain
chemistry
class11
s-block-elements
unit10
q87
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Portland cement does not contain :
jeemain
chemistry
class11
s-block-elements
unit10
q86
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Non metals present in borax are
jeemain
chemistry
class11
s-block-elements
unit10
q85
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The alkali metal used as coolant in nuclear reactors is
jeemain
chemistry
class11
s-block-elements
unit10
q84
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Glauber salt is a
jeemain
chemistry
class11
s-block-elements
unit10
q83
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Pearl ash is
jeemain
chemistry
class11
s-block-elements
unit10
q82
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following salt would give $SO_2$ with hot and dil. $H_2SO_4$ and also decolourise $Br_2$ water?
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Which among the compounds of alkali metals undergo hydrolysis
jeemain
chemistry
class11
s-block-elements
unit10
q81
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The alkali metal bi carbonate that has no existance in solid state is
jeemain
chemistry
class11
s-block-elements
unit10
q80
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Tincal contains mainly
jeemain
chemistry
class11
s-block-elements
unit10
q79
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
What is the formula of calgon?
jeemain
chemistry
class11
s-block-elements
unit10
q78
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following is best $CO_2$ absorber as well as source of $O_2$ in space capsule?
jeemain
chemistry
class11
s-block-elements
unit10
q77
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following salts does not form any ppt with excess of NaOH ?
jeemain
chemistry
class11
s-block-elements
unit10
q76
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Considering greater polarization in lid compared to that in NaCl,which of the following statements you would expect to be wrong?
jeemain
chemistry
class11
s-block-elements
unit10
q75
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
An aqueous solution of coloureless metal sulphate M gives a white precipitate with $NH_4OH$. This was soluble in excess of $NH_4OH$. On passing $H_2S$ through this solution a white ppt is formed. The metal M in the salt is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute $H_2SO_4$ but gives no precipitate with sodium chloride or iodide, it is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
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