A to Z Exams

Which of the following statements is correct

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

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

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 chemical formula of feldspar 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

Which of the following is correct

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

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 of the following is used for making optical instruments ?

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

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 copper metal is mainly extracted from its

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

Anhydrous Magnesium chloride can be prepared by heating MgCl2.2H2O

Order of boiling points

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

List -I List-II (A) Flespar (I) [Ag3SbS3] (B) Asbestos (II) Al2O3 . H2O (C) Pyrargyrite (III) MgSO4 . H2O (D) Diaspore (IV) KAlSi3O3 (V) CaMg3(SiO3)4

The magnetic oxide of iron is

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

Method used for the concentration of tinstone ore is

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

How many litres of oxygen (at STP) are required for complete combustion of 39 g of liquid benzene?(Atomic weights: C = 12, O = 16, H = 1)

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

Identify 'acetaldoxime'

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 ?

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

For the reaction H2(g)+I2(g)⇔2HI(g) at 721 K,the value of equilibrium constant KC is 50.The value of KP under the same conditions will be

The molarity of pure water is:

The earthy impurities present in the mineral are called

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

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

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 sigma and pi bonds in peroxodisulphuric acid are, respectively

Calculate the emf of the cell   Cu (s) | Cu2+ (aq) || Ag+ (aq) | Ag (s)  GivenEoCu2+/Cu  = +0.34V ,  EoAg+/Ag  =0.80 V

On passing a current through molten KCl 19.5 of K is deposited. The amount of aluminium deposited by the same quantity of electricity if passed through molten AlCl3 is

A certain mass of a gas occupies a volume of 2 L at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant

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

The oxidation state of Mo in MO2 (Cl8)4- ion is

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

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:

The molecular formula of potash alum is :

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

Which one of the following statements is correct

AB is an ionic solid. The ionic radii of A+ and B- are respectively rc and ra. Lattice energy of AB is proportional to :

Which of the following functional group shows +R effect

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

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 is not correct

The oxidation states of nitrogen in NH4NO3 is /are

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

In which of the following reactions, the concentration of product is higher than the concentration of reactant at equilibrium (K=equilibrium constant)

Which of the following is not tetrahedral

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

The Kc for the reaction A+B↔C is 4 and Kc for 2A+D↔C is 6. The value of Kc for C+D↔2B is

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

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

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:

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)

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 ?

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

 Which of the following is not correct

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

Which one of the following reactions does not form gaseous product

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

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)?

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

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 cathodes will be in the ratio

 Which of the following is a pair of functional isomers

Which of the following biomolecules acts as specific catalysts in biological reaction

The weight in grams of a non-volatile solute (M.wt:60) to be dissolved in 90 g of water to produce a relative lowering of vapour pressure of 0.02 is

which of the following is not correcr?

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

The correct trends in the hydrides from Bi to N is

Which of the following is an example of interstitial hydride

The number of pπ - dπ 'pi' bonds present in XeO3and XeO4molecules, respectively are

The most abundant group of lipids and animals is

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

In nuclear reactor, heavy water is used as a :

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):

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

Exhausted permutit does not contain .... ion :

Which of the following pairs of ions are colourless ?

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)

The decomposition of H2O2 may be decreased by adding a small quantity of glycerol.This is an example of

Helium mixed with oxygen is used in the treatment of:

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

Which of the following is a favourable factor for cation formation

For a reversible reaction, if the concentrations of the reactants are doubled, then the equilibrium constant value

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

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

The addition of HCl will not suppress the ionization of

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

On passing a current through molten KCl 19.5g of K is deposited.The amount of aluminium deposited by the same quantity of electricity if passed through molten AlCl3 is

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:

Gold number is used to show

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)?

An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is X. What is the circumference of the fourth orbit

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