A to Z Exams

The solubility of the impurities in the metal in molten and solid states is different. The principle involved in the refining of metal 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

Assertion (A) : K, Rb and Cs form superoxides.Reason (R) ;     The stability of the superoxides increase from 'K' to 'Cs' dueto decrease in lattice energy. The correct answer is

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

Order of boiling points

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

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

A catalyst increases the rate of reaction because it :

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 molarity of pure water is:

Which one of the following reactions does not form gaseous product

Which one of the following order is correct for the first ionization energies of the elements

A system absorbs 10kJ of heat and does 4kJ of work. The internal energy of the system

On passing a current through a KCl solution, 19 5 g. of potassium is deposited. If the same quantity of electricity is passed through a solution of aluminium chloride, the amount of aluminium deposited is:

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

One Faraday of current was passed through the electric cells placed in series containing fused electrolytes with Ag+2,Ni2+,Cr3+ ions. The amount of Ag(at.wt=108), Ni(at.wt=59) and Cr(at.wt=52) deposited will be

9.2 grams of N2O4(g) is taken one liter vessel and heated till the following equilibrium is reached N2O4 (g)⇔2NO2(g).At equilibrium 50% of N2O4(g) is dissociated.The value of Kc is

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

The half-life period of a radioactive element is 120 days. After 480 days 4.0 gm of the element will be reduced to (.....) gms.

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

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

A gaseous mixture contains 56g of N2,44g of CO2 and 16g of CH4.The total pressure of th mixture is 720 mm Hg.The partial pressure of CH4 is:

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

5 moles of acid is required to change the pH of 1 litre of buffer by 2units.Find buffer capacity.

The degree of dissociation of an acid HA in 0.1 M solution is 0.1%. Its dissociation constant is ;

x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28g. What is the value of x (in grams)

0.84 g of metal carbonate reacts exactly with 40 mL of N/2 H2S04. The equivalent weight of the metal carbonate is :

Which of the following is an example of interstitial hydride

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

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

The concentration of oxalic acid is 'x'mol L-1. 40 mL of this solution reacts with 16 mL of 0.05 M acidified KMn04. What is the pH  of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociates completely)

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

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

Given that ∆Hf(H) = 218 k J / mol, express the H - H bond energy in k cal/mol

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

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

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

A mixture contains 10 g of oxygen, 28g of nitrogen and 8g of CH4.Total pressure of mixture is 740mm.What is the partial pressure of nitrogen in mm

Which of the following pairs of ions are colourless ?

Which of the following halide does not contain a lone pair of electrons on the central atom

In Freundlich adsorption isotherm, the intercept is equal to

Which one of the following statements is correct

A certain sample of gas has a volume of 0.2 litres measured at 1 atm. pressure and 00 C. At the same pressure but at 273 0c. Its volume will be

Bond energy of Cl2,Br2 and I2 follow the order

Electrons with a kinetic energy of 6.023 x 104 J/mol are evolved from a surface of a metal, when it is exposed to radiation of wavelength of 600 nm, The minimum amount of energy required to remove an electron from the metal atom is

Assertion (A) : A catalyst increases the rate of a reaction.Reason (R) : In presence of a catalyst, the activation energy of the reaction increases. The correct answer is

Oxide of nitrogen which gives reddish brown colour when exposed to air is

An organic compound X on treatment with pyridinium chloro chromate in dichloromethane gives compound 'Y". Compound Y reacts with I2 and alkali to form triiodomethane. The compound 'X' is

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

Which one of the following equation is correct for the reaction N2(g)+3H2(g)→2NH3(g)

Assertion (A) : Equal moles of different substances contain same number of constituent particles.Reason (R) : Equal weights of different substances contain the same number of constituent particles.The correct answer is

Chemisorption involves

If a reaction obeys the following equation. K=2.303/t log10a/a-x, the order of the reaction will be

Which of the following converts acetic acid into acetyl chloride

For the estimation of sulphur by Carius method, the organic compound is heated in Carius tube with

The metal used for the de-bromination reaction of 1, 2 dibromoethane

Which one of the following is used as an acid flux in metallurgy ?

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 is not correcr?

The conjugate acid of NH2- ion is:

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

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

n moles of an ideal gas at temperature T (in kelvin) occupy VL of volume, exerting a pressure of P atmospheres.What is the concentration (in mol / L)?

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?

If a gas contains only three molecules that move with velocities of 100,200,500 ms-1.What is the rms velocity of that gas in ms-1

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

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

In nuclear reactor, heavy water is used as a :

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

Hydrolysis of NCI3 gives NH3 and X. Which of the following is X ?

The oxidation states of nitrogen in NH4NO3 is /are

The decreasing order of bond dissociation  energies of   C-C , C-H and H-H i bond is

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.......

The ΔG in the process of melting of ice at -150C and 1atm pressure is

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

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 compound prepared by a substitution reaction of benzene 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 :

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

Which of the following is not correct

In the hardening stage of plaster of paris, the compound formed is :

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

At 270C, 500 mL of helium diffuses in 30 minutes. What is the time (in hours) taken for 1000 mL of SO2 to diffuse under same experimental conditions ?

Ordinary glass is a combination of the following

Study the following table: Buffer solution Volume(in ml) of 0.M weak Volume(in ml) of 0.1 M sodium salt of weak acid I 4.0 4.0 II 4.0 40.0 III 40.0 4.0 IV 0.1 10.0 Which of the two sets of buffer solutions have least pH?

CH2=CH2+HCl→CH3CH2Cl is an example for

x grams of water is mixed in 69 g of ethanol. Mole fraction of ethanol in the resultant solution is 0.6. What is the value of x in grams ?

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

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 ?

The conjugate acid of SO42- is

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

Which of the following reagents can form a hydrazone with alkanone

Which of the following statements is NOT correct?

Hydrolysis of trichloro methane with aqueous KOH gives

A sample of gas has a volume of 0.2 lit. measured at 1 atm. pressure and 00C. At the same pressure, but at 2730C its volume will become

The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

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

Alcohol manufactured from water gas is

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