Recent questions in Chemistry

Self reduction is possible in which of following :

asked Oct 4, 2018 by meena.p

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An ion $Mn^{a+}$ has the magnetic moment equal to 4.9bm. What is the value of a ?

asked Jul 30, 2018 by meena.p

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Which of the following correctly denotes the catalyst and promoter used in Haber's process for manufacture of ammonia, respectively?

asked Feb 15, 2017 by meena.p

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How to solve this question

asked Jan 20, 2017 by 1999guptaamit

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Chemistry numerical problem

asked May 20, 2016 by stubbynaavi9112000

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What is the correct stereochemical assignment for each of the following alkenes?

asked Jan 18, 2016 by meena.p

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$HCOOK +CH_3COOK \quad \to$ product obtained is/are :

asked Jan 18, 2016 by meena.p

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Moles of sodium thiosulphate reacted and unreacted after the reaction are respecticvely

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:

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 :

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

asked Jan 18, 2016 by meena.p

1 answer

Find the incorrect match.

asked Jan 18, 2016 by meena.p

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Which of the following compounds are the common product/s obtained in the hydrolysis of $XeF_6$ and $XeF_4$.

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 ,$N_A=6 \times 10^{23}]$

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.

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 = $112.5$

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.

asked Jan 18, 2016 by meena.p

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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

asked Jan 18, 2016 by meena.p

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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?

asked Jan 18, 2016 by meena.p

1 answer

Which of the following statement(s) is/are correct?

asked Jan 18, 2016 by meena.p

1 answer

Select the incorrect order

asked Jan 18, 2016 by meena.p

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The bond angle of $H_2 Se$ is best described as being

asked Jan 18, 2016 by meena.p

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Shape of $DCl_4$ is

asked Jan 18, 2016 by meena.p

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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

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:

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.

asked Jan 18, 2016 by meena.p

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If a solution contains 1 mol of $KMnO_4$ in acidic medium, it will oxidize :

asked Jan 18, 2016 by meena.p

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$H_3PO_4$ 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 $Na_3PO_4$ ? $(H = 1, O = 16, Na = 23, P = 31)$

asked Jan 18, 2016 by meena.p

1 answer

Which is the correct order of second ionisation energy ?

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

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

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.

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 :

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 :

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.

asked Jan 18, 2016 by meena.p

1 answer

how many gram of NaOH will be needed to prepare 250 ml 0.1M solution?

asked Aug 5, 2015 by manim31899

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the ratio of atoms and molecules of sulphur present in 57.6g of Sg is

asked Aug 5, 2015 by manim31899

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which of the following is correct about half life period?

asked Jul 18, 2015 by excellentdeals18

1 answer

The rate of reaction for A---> products is 10 mol.lit-1.min-1 at time t1=5minutes. what will be the rate at the time t2=10minutes

asked Jul 7, 2015 by excellentdeals18

1 answer

How we calculate the number of unit cells of diamond in 960 amu of carbon

asked Jul 6, 2015 by sainiramsingh2015

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for a very dilute solution of h3po3 van't hoff factor

asked Jul 4, 2015 by excellentdeals18

1 answer

if a solute under goes dimerization and trimerizaton, the minimum values of the van't hoff factors are

asked Jul 4, 2015 by excellentdeals18

1 answer

Benzoic acid undergoes dimerisation in benzene solution. the vant's hoff factor'i' is related to the degree of association 'α' of the acid as

asked Jul 4, 2015 by excellentdeals18

1 answer

18 gms of glucose and 6 gms Urea are dissolved in 1 litre aqueous solution at 27 °c. the osmotic pressure of solution will be

asked Jul 3, 2015 by excellentdeals18

1 answer

calculate the molal solution depression constant of a solvent which has freezing point 16.6° and latent heat of fusion 180.75J/g

asked Jul 2, 2015 by excellentdeals18

1 answer

Maximum freezing point will be for 1 molal solution of (assuming equal ionization in each case)

asked Jun 16, 2015 by varun28031999

0 answers

correct ordering for the dipole moments of: CO2,BF3,H2O,H2S is?

asked May 21, 2015 by gytiwari18

1 answer

can we calculate formal charge of an atom (which is present in a compound)?

asked May 6, 2015 by johnsenjohnsen0

1 answer

why is formal charge imp?

asked May 5, 2015 by johnsenjohnsen0

1 answer

What makes Alkali metal halides sometimes coloured, which are otherwise colourless

asked Mar 9, 2015 by iitexamsolutions

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