A to Z Exams

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 following are some statements related to VA group hydrides,I . Reducing  property increases from NH3 to BiH3.II..Tendency to donate lone pair decreases from NH3 to BiH3III.Thermal stability of hydrides decreases from NH3 to BiH3.IV. Bond angle of hydrides decreases from NH3 to BiH3.The correct statements are

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

The final product formed on the strong heating of H3BO3

Which of the following compounds when heated with CO at 150"C and 500 atm pressure in presence of BF3 forms ethyl propionate ?

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

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

The most abundant group of lipids and animals is

Ethylene reacted with bromine in CCl4 to form X. When X is reacted with alcoholic KOH, Y is formed. X and Y are respectively :

'Natalite' is used as

Bauxite is boiled with aqueous NaOH solution. Sodium meta aluminate solution is formed. This part in the metallurgy of aluminium is called

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

Which of the following reacts with ethanol to form chloroform

X,Y,Z hydrocarbons molecular formula are CH4, C2H4, C2H2, these three are passed through porcelain tube containing ammonical cuprous chloride. The out coming gases would be

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

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)?

8 gram of NaOH is mixed with 9.8 gram of H2SO4 in litre of solution the pH of the solution is

Dry distillation of calcium acetate and calcium formate forms:

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

Calorific value of producer gas is low because of

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

∆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

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?

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)?

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

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

An isomer of ethanol is

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

Three faradays of electricity was passed through an aqueous solution of iron(II) bromide.The weight of iron metal(at.wt=56) deposited at the cathode is(in grams):

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

The magnetic oxide of iron is

1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the Atomic weight of Cd

Which of the following statements is NOT correct?

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

In dry cell cathode is

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)

Which of the following statements is correct

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

The functional groups present in 'salol' are

Chemisorption involves

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

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

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

Assertion(A): The molecularityof reaction is a whole number other than zero, but generally less than 3. Reason(R): The order of a reaction is always a whole number

Which of the following is not correct

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

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

One mole of alkene X on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of X is

Which of the following is not a lipids

Which of the following is an example of interstitial hydride

Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H2O2. The number of peroxy (O-O) bonds present in X and Y respectively are :

Alcohol manufactured from water gas is

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

Resonance in benzene is accompanied by delocalization of π –electrons. Each π electron is attached with

Gold number is used to show

The oxidation states of nitrogen in NH4NO3 is /are

Identify the correct decreasing order of the following with respect to altitude from atmosphere:I. Troposphere    II. Mesosphere  III. Thermosphere

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 ?

Cuprous ion is colourless while cupric ion is coloured because :

The chemical entities present in thermosphere of the atmosphere

Identify the correct order in which the covalent radius of the following elements increasesI. TiII. CaIII. Sc

Identify 'acetaldoxime'

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

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

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

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

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 compounds forms a quaternary salt on reacting with excess methyl iodide ?

The hydrolysis constant Kh of a salt of NaOH and a weak acid (HX) If the Ka of the acid is Ka=2x10-6

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

Which of the following is not correct

The number of structural alcoholic isomers for C4H10O is

The molecular formula of potash alum 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

Hydrolysis of chloroform with aqueous KOH gives finally

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

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

A radioactive substance 88X228 (IIA) emits 3α and 3β particles to form "Y". To which group of long form of the periodic table does "Y" belong

Atoms of different elements having identical mass are known as :

A quantity of PCl5(g) was heated in a 10 litre vessel at 2500C PCl5(g) ⇔PCl3(g)+Cl2(g) At equilibrium the vessel contains 0.1 mole of PCl5 0.2 mole of PCl3 and 0.2 mole of Cl2 .The equilibrium constant is

H2-O2 fuel cell is

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 :

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 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)

Oxidation number of oxygen in OF2 is

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 ?

3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. Whatare X, Y and Z

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

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

The correct structure of 4-bromo 3-methyl-but-1-ene:

The molarity of pure water is:

Which of the following is a linear molecule

The standard reduction electrode potential values of the elements A, B and C are +0.68V, -2.5V and -0.5V respectively. The order of their reducing power is

Identify the reaction for which ΔH ≠ ΔE :

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 one of the following is a secondary alcohol ?

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

Which of the following is not correct regarding the properties of ionic compounds ?

The first organic compound synthesized in the laboratory from an inorganic compound is: