A to Z Exams

In 0.01 M solution,HCN is 0.01% ionized. Its dissociation constant is

Which of the following is an example of interstitial hydride

How many electrons are present in the M shell of an atom of an clement with atomicnumber 24 (Z = 24) ?

Assertion (A) : At 300 K,kinetic energy of 16 g of methane is equal to the kinetic energy of 32 g of oxygen. Reason (R) : At constant temperature,kinetic energy of one mole of all gases is equal. The correct answer is:

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

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

The heat of neutralization of strong acid and weak base is

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 of the following elements has least number of electrons in its M shell ?

The active mass of 5.6 litres of O2 at STP is

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

Which of the following not obtained when methyl chloride and n-propyl chloride react with sodium in dry ether

The value of Kp for the reaction 2H2S(g)⇔2H2(g)+S2(g) is 1.2 x 10-2 at 10650C.The value of KC for the reaction is

Ethyl chloride reacts with sodium ethoxide to form a compound A. Which of the following reactions also yields A ?

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.

The oxidation states of nitrogen in NH4NO3 is /are

∆x is given by ∆x=(Hydrogen energy-Lattice energy). For a salt ∆x is found to be 500 kcal mol-1.Then on increasing the temperature, its solubility in water

The molar capacity(Cp)of water at constant pressure is 75 J.K-1.mol-1.The increase in temperature (in K) of 100 g of water when 1 K.J. of heat is supplied to it is

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

Which one of the following functional groups undergoes hydrolysis with alkali to yield an acid group

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

Order of boiling points

The IUPAC name of an unsymmetrical ether with the molecular formula C4H10O:

Which of the following statements is not correct ?

The experimental data for the reaction 2NO(g)+Cl2(g)→2NOCl(g) are given below Expt [Cl2] [NO] Initial rate 1 0.020 0.010 2.4x10-4 2 0.020 0.030 2.16x10-3 3 0.040 0.030 4.32x10-3 What is the order of the reaction

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

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

The rate constant of a reaction increased by 3 times for every 100C rise of temperature uniformly in the range 200C to 800C, if the rate of constant at 300C is K, what is its value at 600C

Which of the following pair of ions have same paramagnetic moment

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

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

If ΔE is the heat of reaction for C2H5OH(1)+3O2(g)→2CO2(g)+3H2O(l) at constant volume,the ΔH(Heat of reaction at constant pressure)at constant temperature is

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

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

In which of the following cases, the reaction is spontaneous at all temperatures

The solubility of LiOH in a solution of pH = 8 = is Ksp = 1.8 x 10-12

One mole of fluorine is reacted with two moles of hot concentrated KOH. The products formed are KF, H2O and O2. The molar ratio of KF, H2O and O2 respectively is

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?

H2-O2 fuel cell is

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

In a first order reaction,50 minutes time is taken for the completion of 93.75% of a reaction. Half life of the reaction is

9.2 gm of N2O4(g) is taken in a closed one litre vesseland heated till the following equilibrium is reached N2O4(g)⇔2NO2(g).At equilibrium 50% of N2O4(g) is dissociated.what is the equilibrium constant(in mole lit-1)(M.wt of N2O4 is 92)

A solution of concentration "C" g equiv/litre has a specific resistance R, The equivalent conductance of the solution is

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

The gas that is used for sterilizing water is

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

H3O++OH-→2H2O

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

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

Assertion (A): the molecularity of reaction is a whole number other than zero , but generally less than 3 Reactions (R): the order of a reaction is always whole number

The energy of a photon is 3 x 10-12 ergs.What is its wavelength in nm ?( h = 6.62 x 10 -27ergs-s ; c = 3 x 10 10 cm/s )

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 type of bonds present in sulphuric anhydride

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

When ethyl alcohol reacts with bromine in the presence of alkali the compound formed

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:

Assertion(A): A catalyst has no effect on the state of equilibrium Reason:A catalyst influences the rates of both forward and backward reactions to the same extent

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)

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

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

Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken?

Which of the following is a biodegradable polymer

Exhausted permutit does not contain .... ion :

Which of the following does not participate in carbylamine reaction?

One mole of A and 2 moles of B are allowed to react in a one lit flask. What is the value of Kc if at equilibrium,0.4 moles of C is formed in the reaction A+2B⇔C+2D

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

Which of the following statements is correct

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

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

In aqueous solutions H2O2 oxidises H2S to

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

Which of the following is a lyophobic colloidal solution ?

Which of the following is called Rosenmund reaction?

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?

Assertion (A) : NaCl is less soluble in heavy water than in ordinary water,Reason (R) : Dielectric constant of ordinary water is more than that of heavy waterThe correct answer is

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

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 :

H3O++OH-→2H2O

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

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)?

In the reaction AlCl3+Cl-→[AlCl4]-,AlCl3 acts as

Beryllium shows diagonal relationship with aluminium.Which one of the following similarity is not correct

Which of the following brings about dry bleaching

The correct order of reducing abilities of hydrides of V group elements is

The chemicals and the reaction conditions required for the preparation of ethane are

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

CCl3COCH3+Ca(OH)2→X+Y. Here X and Y are

The rate of gaseous reaction is give by k[A][B].If the volume of reaction vessel is reduced to 1/4 of initial volume the reaction rate relative to the original rate is

The molar concentrations of A,B and C at equilibrium for the reaction A+2B⇔3C are 2,3 and 4 moles/lit respectively. Its Kc is

When X amperes of current is passed through molten AlCl3 for 96.5 second,0.09g of alumunium is deposited.What is the value of X

A complex compound of CO3+ with molecular formula COClx. yNH3 gives a total of 3 ions when dissolved in water. How many Cl- ions satisfy both primary and secondary valencies in this complex

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

A certain current liberated 0.504g of hydrogen in 2hrs. How many grams of copper can be librated by the same current flowing for the same time in a copper sulphate solution

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

The most abundant group of lipids and animals is

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

The functional groups present in 'salol' are

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)

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

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