A to Z Exams

The magnetic oxide of iron is

Among the following compounds which have more than one type of hybridization for carbon atom 1) CH3CH2CH2CH3 2) CH3CH= CHCH3 3) CH2= CH-CH=CH2 4) H-C=C-H

The element that can exhibit highest number of oxidation states amongst the following:

The time for half life of a first order reaction is 1 hour. What is the time taken for 87.5% completion of the reaction

The number of moles of electrons required to deposit 36 g of Al from an aqueous solution of Al(NO3)3 is (At. wt. of Al = 27)

The flux used in the extraction of iron from Haematite in the blast furnace is

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

148mg of Ca(OH)2 is required to remove hardness of one lit. of hard water by Clarke’s process. If hardness is due to only calcium bicarbonate, what is the degree of hardness of sample of water?

Which of the following is a linear molecule

pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 ml of a buffer solution of acetic acid and Potassium acetate at 270C. The buffer capacity of the solution is

Alcohol manufactured from water gas is

Which of the following is a biodegradable polymer

A mixture of Haematite,coke and limestone on heating in blast furnace gives molten iron metal.This is known as

Cuprous ion is colourless while cupric ion is coloured because :

List-I List-II List-III CH3COONa Alc.KOH Ethylene CHCl2-CHCl2 H2O Acetylene C2H5MgI NaOH+CaO Methane CH3-CH2Cl Zn dust Ethane The correct match is

For the redox reaction Cr2O72+ + C2O42+ + H+ → Cr3+ + CO2 + H2O the correct coefficients of Cr2O72-, C2O42- and H+ in the balanced equation are

The ratio of radii of first orbits of H, He+ and Li+2 i

Three faradays of electricity are passed through molten Al2O3. Aqueous solution of CuSO4 and molten NaCl taken in three different electrolytic cells. The amount of Al, Cu and Na deposited at the cathodes will be in the ratio of

The standard reduction potentials of Zn2- | Zn, Cu2+| Cu and Ag+| Cu and Ag+| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :1) Zn | Zn 2+||Cu 2+| Cu2) Zn | Zn 2+||Ag +| Ag3) Cu | Cu 2+||Ag +| Agwhat is the correct order of Eocell of these cells?

The correct trends in the hydrides from Bi to N is

Oxidation number of oxygen in OF2 is

What is the molecular formula of the product formed when benzene is reacted with ethyl chloride in presence of anhydrous aluminum chloride ?

Active mass of 56 g of N2 contained in 2 ltr.Flask is

Absolute alcohol (100% alcohol) is prepared by distilling rectified spirit over:

The type of bonds present in sulphuric anhydride

The value of Kp for the reaction 2H2S(g) ⇔ 2H2(g) + S2(g) is 1.2X10-2 at 10650C.The value of KC for the reaction

The molecule having zero dipole moment is:

Which of the following reagents can form a hydrazone with alkanone

What is the volume (in litres) of oxygen required at STP to completely convert 1.5 mol of sulpher into sulpher dioxide

The average kinetic energy of one molecule of an ideal gas 270C and 1 atm. pressure is

Which of the following is not correct

What is the temperature at which the kinetic energy of 0.3 moles of Helium is equal to the kinetic energy of 0.4 moles of Argon at 400 K ?

The bonds in K4Fe(CN)6 are:

Which of the following is called Rosenmund reaction?

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

For a reaction A+B→ products,the rate of the reaction was doubled.When the concentration of A was doubled.When the concentration of A and B were doubled.The order of the reaction with respect to A and B are

The difference in ΔH and ΔE for the combustion of methane at 270C would be

The order of decrease in atomic radii for Be;Na;Mg 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

What is the time (in sec) required for depositing all the silver present in 125mL of 1 M AgN03 solution by passing a current of 241.25 A ? (1 F = 96500 coulombs)

For the reversible reaction C2H4 + H2 ⇔ C2H6 the equilibrium constant can be expressed in units of

In which of the following reactions the product is an ether

The salt of phosphorous acid are called

The cell reaction of a cell is Mg(g)+Cu2+(aq)→Cu(g)+Mg2+(aq).If the standard reduction potentials of magnesium and copper are -0.33 and +2.38V respectively,the e.m.f of the cell is:

Observe the following statements regarding purification of bauxiteI. During Hall's process, silica is removed as Si (vapour)II. Bauxite ore contaminated with Fe2O3 is purified in Baeyer's processIII. During Serpeck's process, AlN is formedThe correct answer is

Zn(s)+Cu+2(ag)→Cu(s)+Zn+2(ag)Given that ΔfG0 for Cu+2(ag) and Zn+2(ag) are +65.0 K.J.mol-1 and -147.2 K.J.mol-1 respectively then the standard Gibbs energy change for the above reaction is

The equilibrium constants for the reactions N2(g)+O2(g)⇔2NO(g) and NO(g)+1/2 O2(g) are K1 and K2 respectively .Then the equilibrium constant for the reaction N2(g)+O2(g)⇔2NO2(g) is

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

Which of the following is the anhydride of HNO3

In lime kiln the reaction CaCO3(s)⇔CaO(s)+CO2(g)

Nitro benzene on reduction with zinc and NH4CI gives

Which of the following is not a peroxy acid

consider the following reaction equilibrium 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

75% of first order reaction is completed in 32 minutes 50% of the reaction would have been completed in

What are the metal ions present in carnallite ?

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

NH4NO3 on heating to 2500C-2600C gives the gas

Which of the following reagents when heated with ethyl chloride, forms ethylene ?

When 9.65 Coulombs of electricity is passed through a solution of AgN03 (atomic weight of silver 108), the amount of silver deposited is

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

The value of Kc for the reaction N2+3H2 ⇔2NH3 depends on

An organic compound X on treatment with pyridium dichromate in dichloromethane gives compound Y.Compound Y reacts with I2 and alkali to form idoform.The compound X is

The electrolytic conductance of 0.01 M solution of acetic acid is 0.000163 Scm-1 at 298k. The % of dissociation of acetic acid at 298K.Given Am0 of acetic acid =390.7 Scm-2/mole at 298K.

Which pair of oxyacids of phosphorous contain ‘P - H' bonds

Aluminium reacts with NaOH and forms compound X. If the coordination number of aluminium in X is 6, the correct formula of X

A sample of water contains 11.1 ppm of CaCl2 and 9.5 ppm of MGCl2 the hardness of water sample is

Which of the following is not correct

For a given reaction which one is higher than the rest among the following

In Fischer-Ringe's method of separation of nobles gas mixture, from air is used

The amount of electricity that can deposit 108gm of silver from AgNO3 solution is

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

75 ml of 0.2 M HCl is mixed with 25 ml of 1 M HCl. To this solution, 300 ml of distilled water is added. What is the pH of the resultant solution

Which of the following reactions can produce aniline as main product

The rate of the reaction at 400C is 5 units.The rate of same reaction at 800C is nearly(temperature coefficient)

The two sulphur atoms in Na2S2O3 have

CH3COOH ----LiAlH4--->  AA + CH3COOH ---H3O+ ----->  B + H2OIn the above reactions 'A' and 'B' respectively are

The charge present onn one azide ion in columbs is

The IUPAC name for CH3-CH2-CH(OH)-CH=CH2

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

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

Which of the following, compounds is the reactant in Rosenmund's reduction

Which one of the following reactions does not form gaseous product

The gas that is used for sterilizing water is

The reagent used in the preparation of aspirin from salicylic acid is

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is (16/15)hr cm  .What is the value of n2   (R= Rydberg Constant)

When a sample of gas expands from 4.0L to 12.0L against a constant pressure of 0.30 atm, the work involved is (1L ATM=101.35 J)

At 270C the ratio of root mean square velocities of ozone to oxygen is :

Hydrolysis of trichloro methane with aqueous KOH gives

Sodium is heated in air at 3000C to form X. X absorbs CO2 and forms Na2CO3 and Y. Which of the following is Y

Calculate ∆H0 for the reaction Na2O(s) + SO3 (g)→ Na2SO4(g) given the following1. Na(s) + H2O(l) →NaOH (s)+ 1/2 H2(g) ∆H0  = -146kJ2.Na2SO4(s) + H2O(l) →2NaOH(s) + SO3(g) ∆H0  = +418kJ3. 2Na2O(s) + 2H2(g) →4Na (s) + 2 H2O(l) ∆H0 = +259kJ

H3O++OH-→2H2O

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 of the following is used in the preparation of generated water (soda)

Which of the following compounds is soluble in benzene but almost insoluble in water

Which of the following set of variables give a straight line with a negative slope when plotted ?(P - vapour pressure, T = Temperature in K)

The heat of formation of SO2(g) is -297.8 kJ mol-1.The enthalpy change in the decomposition of 1 mole SO2(g) to its constituent elements is

The pH of a solution of H2O2 is 6.0, Some chlorine gas is bubbled into this solution. Which of the following is correct

All the three oxygen atoms of ozone are utilized in the oxidation of

 Which of the following is not correct

X liter of carbon monoxide is present at STP. It is completely oxidized to CO2. The volume of CO2 formed is 11.207 litres. What is the value of X in litres