A to Z Exams

The conjugate acid of NH2- ion is:

......of a reaction cannot be determined experimentally:

Which of the following is correct

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

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

If H++OH-→H2O.ΔH=-57.3 KJ, then the heat of neutralization for complete neutralization of 1 mole H2SO4 by a base is

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

Method used for the concentration of tinstone ore is

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

Conjugate base of H2SO4 is

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

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

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

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

∆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

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 a lipids

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

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

The equilibrium constant for the reaction H2(g)+I2(g)⇔2HI(g) is 81 at a certain temperature.If the concentrations of H2 and I2 are 3mole.lit each at equilibrium,the equilibrium concentration of HI is

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

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

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

CaCl2+C2H5OH→CaCl2xC2H5OH,in this ‘x’ is

The correct trends in the hydrides from Bi to N is

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

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 oxidation states of nitrogen in NH4NO3 is /are

The final product formed on the strong heating of H3BO3

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

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

Which of the following reagents and conditions convert benzene to chlorobenzene

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 ?

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

The Chemical reaction between NaS2O3 and I2 leads to the formation of

The earthy impurities present in the mineral are called

Which of the following has the highest first IP

Which of the following brings about dry bleaching

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

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

90 grams of water and 230 grams of an organic liquid n mixing gives a solution in which the mole fraction of water in the resulting solution is 0.5 the molecular weight of the organic liquid is

PH of a solution produced when aqueous solution of PH 6 is mixed with an equal volume of an aqueous solution oh PH is about

The bonds in K4Fe(CN)6 are:

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

A mixture of Boran trichloride and hydrogen is subjected to silent electric discharge to form ’A’ and HCl. ’A’ is mixed with NH3 and heated to 2000 C to form B. The formula of B is

If 20 mL of 0.4 N NaOH sol ution completely neutralised 40 mL of a dibasic acid, the molarity of the acid solution is :

Which of the following is added to chloroform to slow down its aerial oxidation in presence of light ?

The weakest acid among the following is

When the same amount of zinc is treated with excess of H2SO4 and with excess NaOH, the ratio of the volume of H2 evolved 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

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

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

H2-O2 fuel cell is

Ethylene reacts with Br2 in CCl4 to from X. When X is reacted with alcoholic KOH. Y is formed. Here X and Y are

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

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

What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?

The heat of neutralization of strong acid and weak base is

When aniline is treated with CHCI3 and KOH, the product is :

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

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

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

Chloroethane reacts with Y to form NaCl and Z. One mole of Z reacts with two moles of HI to form water and iodo ethane. Which of the following is Y

The olefin which on ozonolysis gives CH3CH2CHO and CH3CHO 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 hydrolysis constant Kh of a salt of NaOH and a weak acid (HX) If the Ka of the acid is Ka=2x10-6

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

Which of the following statements is correct

Alcohol manufactured from water gas is

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

The chemical entities present in thermosphere of the atmosphere

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

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)?

Aqueous solution of an organic compound, 'A' on electrolysis liberates acetylene and CO2 at anode. 'A' is

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

Equivalent conductance at infinite dilution,λ0 of NH4Cl,NaOH and NaCl are 128.0,217.8 and 109.9 ohm-1cm2eq-1 respectively. The equivalent conductance of 0.01N NH4OH is 9.30 ohm-1cm2eq-1,then the degree of ionization of NH4OH at this temperature would be(approximately)

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

Order of boiling points

At 270C the Kp value for the reaction PCl5(g)⇔PCl3(g)+Cl2(g).is 0.65.Its Kc is

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

Molar conductivity of a solution 1.26 x 102Ω-1cm2mol-1 ,its molarity is 0.01.its specific conductivity will be

In the reaction BCl3+PH3→[Cl3B←PH3] the lewis base is

Oxidation number of oxygen in OF2 is

A(g)+2B(g)⇔2C(g)+D(g) was studied using an initial concentration of B which was 1.5 times that of A .But the equilibrium concentrations of A and B were found to be equal .Then Kc for the equilibrium

pH of pure H2O at 250C is

Hybridisation of oxygen in diethyl ether is

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

The molecular formula of potash alum 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?

The half-life period of a radioactive substance is 150 days. Starting with an initial quantity of 1 mg of the substance the fraction of that has disintegrated in 600 days is

A molecule (X ) has (i) four sigma bonds formed by the overlap of sp2 and s orbitals (ii) one sigma bond formed by sp2 and sp2 orbitals and (iii) one π bond formed by px and pz orbitals. Which of the following is X ?

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

Which of the following functional group shows +R effect

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

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

Which of the following is not correct

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

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