A to Z Exams

At T (K), 100 L of dry oxygen is present in a sealed container. It is subjected to silent electric discharge, till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at T (K)?

Liquid benzene burns in oxygen according to 2C6H6(l)+15O2 (g)→12CO2 (g)+6H2O(l) .How many litres of oxygen are required for complete combustion of 39 gms.Of liquid C6H6

The value of Kp for the reaction 2AB(g)⇔2A(g)+B2(g) is 1.2x10-2 at 1065oC.The value of Kc for this reaction is

The vapour pressure of water at 230C is 19.8 mm. 0.1 mole of glucose is dissolved in 178.2 g of water. What is the vapour pressure (in mm) of the resultant solution

 Which of the following is a pair of functional isomers

The total pressure of a mixture of 6A of O2 and 5.6 g of N2 present in a 2 litre vessel is 1200 mm. What is the partial pressure (in mm) of nitrogen?

How many 'ml' of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2 lit of SO2 gas to SO3 gas

Consider the two gaseous equilibria involving SO2 and the corresponding equilibrium constants at 298K SO2(g)+1/2O2(g)⇔SO3(g);K1 2SO3(g)⇔2SO2(g)+O2(g);K2 The values of the equilibrium constants are related by

A radio isotope has a half life 10 days.If today there is 125g of it left,what was its weight 40 days earlier?

The number of sigma and pi (π) bonds present in benzene respectively are :

The hydronium ion concentration of a solution is 1X10-4 M at 250 C.The hydroxide ion concentration in the same solution is

Anhydrous Magnesium chloride can be prepared by heating MgCl26H2O

1 mole of PCl5 is heated with 0.2 mole of chlorine in a one litre vessel till equilibrium is established. At equilibrium if 0.8 mole of chlorine in the vessel, the value of equilibrium constant for the dissociation of PCl5 is (in moles-lit-1)

A mixture of sodium oxide and calcium oxide are dissolved in water,and saturated with excess carbon dioxide gas.The resulting solution is.....It contains.......

Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T) ?

Number of coulombs of current required to convert completely 1 mole of MnO4- ions in acid medium to one mole of Mn2+ ions electrolytically is

In which of the following reactions, the concentration of product is higher than the concentration of reactant at equilibrium (K=equilibrium constant)

In the reaction AlCl3+Cl-→AlCl4-, AlCl3 is

If a solid is dispersed in a liquid the colloid is called

In photoelectric effect, if the energy required to overcome the attractive forces on the electron,(work functions) of Li, Na and Rb are 2.41eV, 2.30eV and 2.09eV respectively, the work function of ‘K’ could approximately be in eV

The equilibrium constant for the reactionSO2(g) + (1/2) O2(g) <====> SO3(g) is  5 x 10-2 atm  The equilibrium constant of the reaction2SO3(g)  <====> 2SO2(g) + O2(g) would be

One atom of 3919K contains:

Aniline is treated with NaNO2 and HCl at 00C,the product formed is:

When compound X is oxidised by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAlH4 gives X. X and Y respectively are :

Which among the following element does not liberate H2 gas on reaction with NaOH?

Hydrolysis of trichloro methane with aqueous KOH gives

What is the hybridization state of the central atom in the conjugate acid of NH3?

Which of the following reagents and conditions convert benzene to chlorobenzene

An organic compound containing C and H has 92.3% of carbon, Its empirical formula is:

In the extraction of iron from haematite,the charge used is haematite,coke and lime stone in the following weight ratio

The type of bonds present in sulphuric anhydride

28g of N2 and 6g of H2 were mixed initially .At equilibrium 17g of NH3 was formed.The weight of N2 and H2 at equilibrium are respectively

The correct trends in the hydrides from Bi to N is

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1 : 4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?

The bonds in K4Fe(CN)6 are:

Which of the following pairs of ions are colourless ?

when acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that

A codon has a sequence of A and specifies a particular B that is to be incorporated into aC What areA, B, C

The atomic numbers of elements X, Y and Z are 19, 21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order

Which of the following biomolecules acts as specific catalysts in biological reaction

H2-O2 fuel cell is

The numbers of unit cells present in 5.85mg of NaCl crystal are

Two oxides of nitrogen,NO and NO2 react together at 2530K and form a compound of nitrogen X.X reacts with water to yield another compound of nitrogen Y.The shape of the anion of Y molecule is

SiCl4 on hydrolysis forms X and HCI. Compound X loses water at 1000oC and gives Y. Compounds X and Y respectively are

The number of oxygen atoms bonded to one phosphorus atom in P4O6 is:

Carbogen to

The order of pH of 0.200 M solutions of NH4NO3, NaNO3 and Na2CO3 is

Solubility product of Ba(OH)2 and Al(OH)3 are 1.8x10-10 and 2.4x10-20 respectively.If both Al3+ and Ba+2 ions are present is a solution,which one will be precipated on addition of Ammonium hydroxide solution

3.42g of substance of molecular weight 342 is present in 250g of water.Molality of this solution is

CFCl3 is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen ?

The weakest acid among the following is

Which of the following alkali metals has the greatest tendency for the half reaction;  M(g) →M+(aq) + e

In the extraction of copper, the slag formed in the blast furnace

The decomposition of H2O2 may be decreased by adding a small quantity of glycerol.This is an example of

Which of the following is not correct

Which of the following pair of transition metal ions, have the same calculated values of magnetic moment

Assertion (A) : A current of 96.5 A is passed into aqueous AgNO3 solution for 100 s. The weight of silver deposited is 10.8 g (At. wt. of Ag = 108)Reason (R) : The mass of a substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passing through the electrolyte.The correct answer is :

The molar conductance of HCl,NaCl and CH3COONa are 426,126 and 91Ω-1cm2mol-1 Respectively. The molar conductance for CH3COOH is

For the reaction A(g)⇔B(g)+C(g),Kp at 4000C is 1.5x10-4 and Kp at 6000C is 6x10-3 Then the incorrect statement is

138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

Which of the following is a lyophobic colloidal solution ?

A 0.2 molal aqueous solution of a weak acid (HX) is 20 percent ionized. The freezing point of this solution is (Given Kf = 1.860C kg mol-1 for water)

List -I List-II (A) Flespar (I) [Ag3SbS3] (B) Asbestos (II) Al2O3 . H2O (C) Pyrargyrite (III) MgSO4 . H2O (D) Diaspore (IV) KAlSi3O3 (V) CaMg3(SiO3)4

The equilibrium constant for the reaction is 6.The initial concentration of each of CH3COOH and C2H2OH is two(mole/lit).What is the concentration of CH3COOC2H5 at equilibrium in moles /lit

When a copper wire is dipped in a aqueous AgNO3 solution, the solution turns blue,The reason for this is

HCl+H2O?H3O++Cl- A Conjugate base of HCl is Cl- B Conjugate base of H3O+ is H2O C Conjugateacid base pair is HCl and H3O+ D Conjugateacid base pair is Cl- and H2O

The molarity of pure water is:

Which of the following brings about dry bleaching

The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

If the length of the unit cell is 5 Ao. the smallest distance in Ao between the two neighbouring metal atoms in a face centred cubic lattice is

During the electrolysis of cyrolite,aluminium and fluorine are formed in.......molar ratio

The rate constant of a first order reaction at 27°C is 10-3 min-1. The temperature coefficient of this reaction is 2. What is the rate constant (in min-1) at 17°C for this reaction ?

An endothermic reaction A→B has an activation energy 15 kCal/mole and energy of the reaction is 5 kCal/mole. The activation energy of the reaction B→A is

The conjugate base of HSO4- ion is:

The r.m.s. velocity of an ideal gas at 300 K is 12240 cm/sec. What is the most probable velocity at that temperature?

The chemical entities present in thermosphere of the atmosphere

The Kc for the reaction A+B↔C is 4 and Kc for 2A+D↔C is 6. The value of Kc for C+D↔2B is

The heat of formation (ΔHf) of H2O(g) is -243 KJ.ΔE of it at temperature T is

The number of pπ - dπ 'pi' bonds present in XeO3and XeO4molecules, respectively are

In the Dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173K. Which one of the following gaseous mixtures is not adsorbed on to the charcoal ?

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide ?

The weight in grams of a non-volatile solute (M.wt:60) to be dissolved in 90 g of water to produce a relative lowering of vapour pressure of 0.02 is

What is the quantity of electricity (in Coulombs) required to deposit all the silverfrom 250 mL of 1 M AgNO3 solution

Method used for the concentration of tinstone ore is

On adding a little phosphorous to silicon, we get a/an

In a 500ml flask,the degree of dissociation of PCl5 at equilibrium is 40% and the initial amount in 5 moles.The value of equilibrium constant in mol lit-1 for the decomposition of PCl5 is

Which one of the following noble gases is used in miner's cap lamps

The gold numbers of three protective colloids A, B, and C are 0.05, 0.01 and 0.5 respectively. The decreasing order of their protective power is

A metal nitride contains 28% nitrogen by weight. The molecular formula of metal nitride is M3N2 What is the atomic weight of metal

In the extraction of sodium by Down's process, cathode and anode are respectively:

Which of the following is not a conjugate acid-base pair

which of the following is not correcr?

The   IUPAC    name    of   the    compound(CH3)2CH-CH=CH-CHOH-CH3 is

Consider the following reaction N2 (g)+3H2 (g)⇔2NH3 (g).Initially ,1 mole of N2 and 3 moles of H2 are taken in a 2 litre flask.At equilibrium state if the number of moles of N2 is 0.6 what is the total number moles of all gases present in the flask at equilibrium

The nature of forces operating between the adsorbate and the adsorbent in the adsorption occurring at high temperature is

pH of pure H2O at 250C is

Which one of the following pairs of reactants does not form oxygen when theyreact with each other

The heat of formation of HI from the equation H2+I2→2HI,ΔH=+52 KJ is

Vicinal dihalide (C2H4Br2) on heating with excess alc.KOH and Zinc dust gives ’y’ and ‘z’ respectively. Both ‘y’ and ’z’ on oxidation with Bayer’s regent gives A and B.A and B respectively are

Dipole moment of HC1 = 1.03 D, HI = 0.38 D. Bond length of HC1 = 1.3 and HI = 1.6A .The ratio of fraction of an electric charge, δ, existing on each atom in HC1 and HI is