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Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

A sugar syrup of weight 214.2g contains 34.2g of sugar ($C_{12}H_{22}O_{11})$. Calculate (i) Molal concentration and (ii) Mole fraction of sugar in the syrup.

asked Mar 26, 2014 by sreemathi.v

1 answer

$2K_3Fe(CN)_6+2KOH\rightarrow x+y+z$,$H_2O_2+z\rightarrow y+w$.The $y$ is

asked Mar 25, 2014 by balaji.thirumalai

1 answer

Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound X, if water during the reaction is continuously removed. The compound formed is generally known as

asked Mar 25, 2014 by thanvigandhi_1

1 answer

In the above sequence of reactions, A and B are

asked Mar 25, 2014 by thanvigandhi_1

1 answer

Ethyl isocyanide on acidic hydrolysis generates

asked Mar 25, 2014 by thanvigandhi_1

1 answer

Which of the following has the smallest number of molecules?

asked Mar 25, 2014 by sreemathi.v

1 answer

A certain compound has the molecular formula $X_4O_6$.If 10.0g of compound contains 6.06g of X,the atomic mass of $X$ is

asked Mar 25, 2014 by sreemathi.v

1 answer

A solution contains $1.2046\times 10^{24}$ hydrochloric acid molecules in one $dm^3$ of the solution.The strength of the solution is

asked Mar 25, 2014 by sreemathi.v

1 answer

When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. Lowest molecular mass optically active ketone contians ____ carbon atoms?

asked Mar 25, 2014 by balaji.thirumalai

1 answer

The weight of one molecule of a compound $C_{60}H_{122}$ is

asked Mar 25, 2014 by sreemathi.v

1 answer

0.078g of a hydrocarbon occupy 28.414mL of volume at S.T.P.The empirical formula of the hydrocarbon is CH.The molecular formula of hydrocarbon is

asked Mar 25, 2014 by sreemathi.v

1 answer

The vapour pressure of pure liquid solvent A is 0.80atm.When a non volatile substance B is added to the solvent,its vapour pressure drops to 0.40atm,the mole fraction of component B in the solution is

asked Mar 25, 2014 by balaji.thirumalai

1 answer

19.7Kg of gold was recovered from a smuggler. How many atoms of gold were recovered? ( at. mass. of Au = 197 )

asked Mar 25, 2014 by sreemathi.v

1 answer

A signature written with carbon pencil weighs 1mg.What is the number of carbon atoms present in signature?

asked Mar 25, 2014 by sreemathi.v

1 answer

Two grams sulphur is completely burnt in oxygen to form $SO_2$.In this reaction.What is the volume (in litres) of oxygen consumed at S.T.P?(At.mass of S and O are 32 and 16 respectively.)

asked Mar 25, 2014 by sreemathi.v

1 answer

Assuming fully decomposed,the volume of $CO_2$ released at STP on heating 9.85g of $BaCO_3$ (Atomic mass of Ba=137) will be

asked Mar 25, 2014 by sreemathi.v

1 answer

Volume occupied by 4.4g of $CO_2$ is

asked Mar 25, 2014 by sreemathi.v

1 answer

The percentage of oxygen in NaOH is

asked Mar 25, 2014 by sreemathi.v

1 answer

A gas is found to have formula $[CO]_x$.If its vapour density is 70 then the value of x is

asked Mar 25, 2014 by sreemathi.v

1 answer

In alkaline medium,$KMnO_4$ reacts as follows:$2KMnO_4+2KOH\rightarrow 2K_2MnO_4+H_2O+O$.Therefore,the equivalent weight of $KMnO_4$,will be

asked Mar 25, 2014 by sreemathi.v

1 answer

The relative abundance of two isotopes of atomic weight 85 and 87 is 75% and 25% respectively.The average atomic weight of element is

asked Mar 25, 2014 by sreemathi.v

1 answer

'M' g of an element gave 'N' g of oxide.Equivalent weight of the element is

asked Mar 25, 2014 by sreemathi.v

1 answer

A container of volume V contains 0.28g of $N_2$ gas.If the same volume of an unknown gas under similar conditions of temperature and pressure weighs 0.44g,the molecular mass of the gas is

asked Mar 25, 2014 by sreemathi.v

1 answer

112.0ml of $NO_2$ at STP was liquefied,the density of the liquid being $1.15gmL^{-1}$.Calculate the volume and the number of molecules in the liquid $NO_2$.

asked Mar 25, 2014 by sreemathi.v

1 answer

X and Y are two elements which form $X_2Y_3$ and $X_3Y_4$.If 0.20mol of $X_2Y_3$ weighs 32.0g and 0.4mol of $X_3Y_4$ weighs 92.8g.The atomic weights of X and Y are respectively

asked Mar 25, 2014 by sreemathi.v

1 answer

The number of gram atoms of oxygen present in 0.3 gram mole of $H_2C_2O_4.2H_2O$(oxalic acid) is

asked Mar 25, 2014 by sreemathi.v

1 answer

If $N_A$ is the Avogadro's number then number of valence electrons in 4.2g of nitride ion($N^{3-})$ is

asked Mar 25, 2014 by sreemathi.v

1 answer

At STP ( standard temperature and pressure ) 40L of $CO_2$ contains

asked Mar 25, 2014 by sreemathi.v

1 answer

If the Avogadro's number is $1\times 10^{23}$ mol$^{-1}$ then the mass of one atom of oxygen would be

asked Mar 25, 2014 by sreemathi.v

1 answer

Chemical reactions involve interaction of atoms and molecules.A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses.To handle such large numbers conveniently,the mole concept was introduced.This concept has implications in diverse areas such as analytical chemistry,biochemistry,electrochemistry and radiochemistry.The following example illustrates a typical case involving chemical/electrochemical reaction.A H.O molar aqueous solution of NaCl is prepared and 500ml of this solution is electrolysed.This leads to the evolution of chlorine gas at one of the electrodes(atomic mass:Na=23,Hg=200;1 faraday=96500 coulombs).The total charge (coulombs) required for complete electrolysis is

asked Mar 25, 2014 by sreemathi.v

1 answer

Chemical reactions involve interaction of atoms and molecules.A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses.To handle such large numbers conveniently,the mole concept was introduced.This concept has implications in diverse areas such as analytical chemistry,biochemistry,electrochemistry and radiochemistry.The following example illustrates a typical case involving chemical/electrochemical reaction.A H.O molar aqueous solution of NaCl is prepared and 500ml of this solution is electrolysed.This leads to the evolution of chlorine gas at one of the electrodes(atomic mass:Na=23,Hg=200;1 faraday=96500 coulombs).If the cathode is a Hg electrode,the maximum weight (g) of amalgam formed from this solution is

asked Mar 25, 2014 by sreemathi.v

1 answer

Chemical reactions involve interaction of atoms and molecules.A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses.To handle such large numbers conveniently,the mole concept was introduced.This concept has implications in diverse areas such as analytical chemistry,biochemistry,electrochemistry and radiochemistry.The following example illustrates a typical case involving chemical/electrochemical reaction.A H.O molar aqueous solution of NaCl is prepared and 500ml of this solution is electrolysed.This leads to the evolution of chlorine gas at one of the electrodes(atomic mass:Na=23,Hg=200;1 faraday=96500 coulombs).The total number of moles of chlorine gas evolved is:

asked Mar 25, 2014 by sreemathi.v

1 answer

What volume of $CO_2$ will be liberated at NTP if 1.2g of carbon is burnt in excess of oxygen?

asked Mar 25, 2014 by sreemathi.v

1 answer

The specific heat of a metal is 0.11 and its equivalent weight is 18.61.Its exact atomic weight is

asked Mar 25, 2014 by sreemathi.v

1 answer

$6.0\times 10^{20}$ molecules of urea are present in 100ml of its solution .The concentration of urea solution is

asked Mar 25, 2014 by sreemathi.v

1 answer

A compound possesses 8% sulphur by mass.The least molecular mass is

asked Mar 25, 2014 by sreemathi.v

1 answer

The number of atoms in 4.25g of $NH_3$ is approximately

asked Mar 25, 2014 by sreemathi.v

1 answer

5.85g of NaCl is dissolved in 1L of pure water.The number of ions in 1ml of this solution is

asked Mar 25, 2014 by sreemathi.v

1 answer

20g of sample of $Ba(OH)_2$ is dissolved in 50c.c of 0.1N HCl solution.The excess of HCl has titrated with 0.1NaOH.The volume of NaOH used was 20c.c.Calculate percentage of $Ba(OH)_2$ in the sample

asked Mar 24, 2014 by sreemathi.v

1 answer

The reaction of chloroform with alcoholic $KOH$ and p-toluidine gives

asked Mar 22, 2014 by thanvigandhi_1

1 answer

The correct order of increasing basic strength of bases $NH_3, CH_3NH_2\: and\: (CH_3)_2NH$ is

asked Mar 22, 2014 by thanvigandhi_1

1 answer

Reduction of $CH_3-NC$ with Hydrogen in the presence of $pt$ or $Ni$ as catalyst gives

asked Mar 22, 2014 by thanvigandhi_1

1 answer

Unpleasant smell of carbylamines is obtained when chloroform and alcoholic $KOH$ are treated with

asked Mar 22, 2014 by thanvigandhi_1

1 answer

An organic compound (A) on reduction gives compound (B).(B) On treatement with $CHCl_3$ alcoholic potash gives (C) (C) on catalytic reduction gives N-methyl aniline.The compound A is

asked Mar 22, 2014 by thanvigandhi_1

1 answer

Among the following the strongest base is

asked Mar 22, 2014 by thanvigandhi_1

1 answer

The number of isomeric forms that are represented by the aromatic compound $C_7H_9N$ is

asked Mar 22, 2014 by thanvigandhi_1

1 answer

A $75.0\;\text{g}$ sample of a metal is heated by adding $450\;\text{J}$ of heat. If it's temperature increases from $22 ^{\circ} \text{C}$to $37 ^{\circ} \text{C}$, what is the molar mass of the metal?

asked Mar 22, 2014 by balaji.thirumalai

1 answer

What is the percentage ionic character of $KCl$ given the following: The dipole moment of $KCl$ is $3.336 \times 10^{-29} \text{coulomb-meter}$. The interatomic distance between $K^{+}$ and $Cl^{-}$ is $2.6 \times 10^{-10}\;m$.

asked Mar 22, 2014 by balaji.thirumalai

1 answer

Which of these molecules have dipole-dipole forces? $(1) \;CO_2 \quad (2) \; CH_2Cl_2 \quad (3)\; CH_4$

asked Mar 22, 2014 by balaji.thirumalai

1 answer

Identify the product $C$ in the sequence

asked Mar 21, 2014 by thanvigandhi_1

1 answer

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