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Recent questions tagged chemistry
Questions
Why Nitrogen is a gas whereas phosphorous is a solid ?
cbse
class12
chemistry
ch1
states-of-matter
solid-state
sec-a
asked
Oct 13, 2016
by
meena.p
0
answers
What is the correct stereochemical assignment for each of the following alkenes?
jeemain
chemistry
oxygen
asked
Jan 18, 2016
by
meena.p
1
answer
$HCOOK +CH_3COOK \quad \to$ product obtained is/are :
jeemain
chemistry
oxygen
asked
Jan 18, 2016
by
meena.p
1
answer
Moles of sodium thiosulphate reacted and unreacted after the reaction are respecticvely
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
X and Y are two volatile liquids with molar weights of $10\; g\; mol^{–1}$ and $40\; g\; mol^{–1}$ respectively. Two cotton plugs, one soaked in X and the other soaked in Y, are simultaneously placed at the ends of a tube of length $L = 24\; cm$, as shown in the figure. The tube is filled with an inert gas at 1 atmosphere pressure and a temperature of $300\; K$. Vapours of X and Y react to form a product which is first observed at a distance d cm from the plug soaked in X. Take X and Y to have equal molecular diameters and assume ideal behaviour for the inert gas and the two vapours.The experimental value of d is found to be smaller than the estimate obtained using Graham’s law. This is due to:
jeemain
chemistry
practical-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
X and Y are two volatile liquids with molar weights of $10\; g\; mol^{–1}$ and $40\; g\; mol^{–1}$ respectively. Two cotton plugs, one soaked in X and the other soaked in Y, are simultaneously placed at the ends of a tube of length $L = 24\; cm$, as shown in the figure. The tube is filled with an inert gas at 1 atmosphere pressure and a temperature of $300\; K$. Vapours of X and Y react to form a product which is first observed at a distance d cm from the plug soaked in X. Take X and Y to have equal molecular diameters and assume ideal behaviour for the inert gas and the two vapours.The value of d in cm (shown in the figure), as estimated from Graham’s law, is :
jeemain
chemistry
chemistry-in-everyday-life
asked
Jan 18, 2016
by
meena.p
1
answer
For the estimation of nitrogen $1.4\; g$ of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60\; mL$ of $M/10$ sulphuric acid. The unreacted acid required $20\; ml$ of $M/10$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is
jeemain
chemistry
nitrogen
asked
Jan 18, 2016
by
meena.p
1
answer
Find the incorrect match.
jeemain
chemistry
some-basic-principles-of-organic-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
Which of the following compounds are the common product/s obtained in the hydrolysis of $XeF_6$ and $XeF_4$.
jeemain
chemistry
halogens
asked
Jan 18, 2016
by
meena.p
1
answer
An element X (atomic wt. =125) crystallises is simple cubic structure. If diameter of the largest atom which can be placed without disturbing unit cell is $366\;pm$. Find the density of pure element X in $gm/cm^3$ [Given ,$N_A=6 \times 10^{23}]$
jeemain
chemistry
some-basic-concepts-in-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
Statement - 1: At constant temperature the density of a gas doubles when the pressure of the gas is doubled in a closed system. Statement - 2: At constant temperature molecular mass of a gas is directly proportional to the density and inversely proportional to the pressure.
jeemain
chemistry
coordination-compounds
asked
Jan 18, 2016
by
meena.p
1
answer
Using the following information determine the boiling point of a mixture contains $1560$ gm benzene and $1125\; gm$ chlorobenzene, when the external pressure is $1000\; torr$ Assume the solution is ideal.Given : Molar mass of benzene =$ 78$ ; Molar mass of chlorobenzene = $112.5$
jeemain
chemistry
p-block-elements
asked
Jan 18, 2016
by
meena.p
1
answer
Statement-1: All bonds inside the ring in pyridine are of identical length. Statement-2: Pyridine have two equal contributing resonating structure.
jeemain
chemistry
hydrocarbons
asked
Jan 18, 2016
by
meena.p
1
answer
Isohydric solutions are the solutions having the same concentration of hydronium ion. If $0.2 \;M \;HA$ (monobasic acid) solution is isohydric with $4×10^{-4}\; M\; HCl$ solution, then $K_b$ for $A¯$ is
jeemain
chemistry
hydrogen
asked
Jan 18, 2016
by
meena.p
1
answer
In a constant pressure process for $5$ mole of an ideal monoatomic gas, the temperature of gas increased from $300\;K$ to $500\; K$. Which of the following is incorrect regarding the process?
jeemain
chemistry
general-principals-and-processes-of-isolation-of-metals
asked
Jan 18, 2016
by
meena.p
1
answer
Which of the following statement(s) is/are correct?
jeemain
chemistry
chemical-kinetics
asked
Jan 18, 2016
by
meena.p
1
answer
Select the incorrect order
jeemain
chemistry
surface-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
The bond angle of $H_2 Se$ is best described as being
jeemain
chemistry
classification-of-elements-and-periodicity-of-properties
asked
Jan 18, 2016
by
meena.p
1
answer
Shape of $DCl_4$ is
jeemain
chemistry
chemical-bonding-and-molecular-structure
asked
Jan 18, 2016
by
meena.p
1
answer
If electron, hydrogen, helium and neon nuclei are all moving with the velocity of light, then the wavelengths associated with these particles are in the order
sat
jeemain
chemistry
atomic-structure
asked
Jan 18, 2016
by
meena.p
1
answer
For the vaporization process of HI, the molar entropy and molar enthalpy are respectively, $89.0\;J \;K^{-1}\; mol^{-1}$ and $21.16\; kJ\; mol^{-1}$. The temperature at which the value of $\Delta G$ becomes zero for this process is:
jeemain
chemistry
chemical-thermodynamics
asked
Jan 18, 2016
by
meena.p
1
answer
State True or False$S_1$ : Third group of periodic table accommodates maximum number of elements. $S_2$ : Due to presence of half filled and fully filled sub shells in electronic configuration electronegativity of atom increases. $S_3$ : The element of 13th group and 7th period will have atomic number 113. $S_4$ : diagonal relationship in 2nd and 3rd period element is found due to similar charge to size ratio.
jeemain
chemistry
equilibrium
asked
Jan 18, 2016
by
meena.p
1
answer
If a solution contains 1 mol of $KMnO_4$ in acidic medium, it will oxidize :
jeemain
chemistry
some-basic-concepts-in-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
$H_3PO_4$ is a tribasic acid and one of its salts is $NaH_2PO_4$. What volume of $1\; M\; NaOH$ solution should be added to $12\; g$ of $NaH_2PO_4$ to convert it into $Na_3PO_4$ ? $(H = 1, O = 16, Na = 23, P = 31)$
jeemain
chemistry
electrochemistry
asked
Jan 18, 2016
by
meena.p
1
answer
Which is the correct order of second ionisation energy ?
jeemain
chemistry
chemical-bonding-and-molecular-structure
asked
Jan 18, 2016
by
meena.p
1
answer
$70\;ml$ of $2$ molal $HNO_3$ solution whose density is $1.126\;g/ml$ is mixed with $30\; ml$ of $2$ molal $NaOH$ solution whose density is $1.08\; g/ml$ and some water is also added so that concentration of $H^{+}$ ion in resulting solution becomes $0.2\; M.$ How many mili moles of $H^{+}$ will be present in final solution
jeemain
chemistry
solutions
asked
Jan 18, 2016
by
meena.p
1
answer
STATEMENT-1 : In reaction, $MnO_4^{–}+5Fe^{2+} 8H^{+} Mn^{2+} + 5Fe^{3+} + 4H_2O, MnO_4^{–}$ acts as oxidising agent. STATEMENT-2 : In the above reaction, $Fe^{2+}$ is converted
jeemain
chemistry
atomic-structure
asked
Jan 18, 2016
by
meena.p
1
answer
STATEMNENT-1 : In a solution of water and ethyl alcohol, if mole fraction of ethyl alcohol is $0.9,$ then water acts as solute in the solution. STATEMNENT-2 : If both the components of solution are in same physical state as that of solution, the component present in major amount is known as solvent and the other component is known as solute.
jeemain
chemistry
states-of-matter-gas
asked
Jan 18, 2016
by
meena.p
1
answer
In basic solution, $CrO_4^{2–}$ oxidises $S_2O_3^{2–}$ to form $Cr(OH)_4^{–} \& SO_4^{2–}$. The volume of $0.15\; M CrO_4^{2–}$ required of react with $40\; ml$ of $0.225\;M \;S_2O_3^{2–}$ would be :
jeemain
chemistry
states-of-matter
solid-state
asked
Jan 18, 2016
by
meena.p
1
answer
The molar ratio of $Fe^{2+} to\; Fe^{3+} in\; a\; mixture\; of\; FeSO_4$ and $Fe_2(SO_4)_3$ having equal number of sulphate ion in both ferrous and ferric sulphate is :
jeemain
chemistry
some-basic-concepts-in-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
A mixture of $NH_4NO_3$ and $(NH_4)_2HPO_4$ contain $30.4 \%$ mass percent of nitrogen. What is the mass ratio of the two components in the mixture.
jeemain
chemistry
some-basic-concepts-in-chemistry
asked
Jan 18, 2016
by
meena.p
1
answer
Resonance is due to :
cbse
class12
chemistry
ch-16
chemistry-in-everyday-life
asked
Dec 22, 2015
by
meena.p
0
answers
The property of catenation is strongestin carbon because :
cbse
class12
chemistry
ch-16
chemistry-in-everyday-life
asked
Dec 22, 2015
by
meena.p
1
answer
Polythene is a/an:
cbse
class12
chemistry
ch-16
chemistry-in-everyday-life
asked
Dec 22, 2015
by
meena.p
1
answer
Gold and silver are extracted from their respective ares by
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Heating of carbonates to remove carbon dioxide is called
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Which oil is used as frother in the frith floatation process ?
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Cinnabar is the are containing
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Which metal is obtained by self reduction process ? or Where the proportionally constant k is called rate constant
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Specific gravity of slag is
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Van Arkel method of purification of metals involves converting the metal to a
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Which of the following substance contains both ca and Mg ?
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Which of the following fluxes is used to removed acidic impurites in metallurgical process ?
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Malachite is a mineral of
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Mercury is transported in metal containers made up of
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
0
answers
Mercury is transported in metal containers made up of
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Zinc blende is
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
In the extraction of iron slag produced is
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Chromium is obtained by reducing purified chromite ore with
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
Refractory material are used in furnaces because they
cbse
class12
chemistry
ch-6
isolation-of-elements
asked
Dec 22, 2015
by
meena.p
1
answer
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