A to Z Exams

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

Bond energy of Cl2,Br2 and I2 follow the order

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

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

Which of the following reagents can form a hydrazone with alkanone

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 Chemical reaction between NaS2O3 and I2 leads to the formation of

A 0.2 molal aqueous solution of a weak acid (HX) is 20 percent ionized. The freezing point of this solution is (Given Kf = 1.860C kg mol-1 for water)

The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :

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

Anhydrous Magnesium chloride can be prepared by heating MgCl26H2O

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

Which of the following compounds is soluble in benzene but almost insoluble in water

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

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 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

The addition of HCl will not suppress the ionization of

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

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

The number of primary alcoholic isomers with the formula C4H10O is

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

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

The value of Kc for the reaction N2+3H2 ⇔2NH3 depends on

The earthy impurities present in the mineral are called

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

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

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

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

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

Calculate the hydrolysis constant of a salt of a weak acid(Ka=2x10-6) and of a weak base(Kb=5x10-7)

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

Which of the following is a linear molecule

Oxidation number of oxygen in OF2 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

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 number of structural alcoholic isomers for C4H10O 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

Helium mixed with oxygen is used in the treatment of:

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

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

Which one of the following is used in the preparation of styrene?

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

Carbogen to

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)

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

Bhopal gas tragedy of 1984 was caused by

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

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

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 time for half life of a first order reaction is 1 hour. What is the time taken for 87.5% completion of the reaction

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

Which of the following has S---S bond ?

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

Identify 'acetaldoxime'

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

Sodium is heated in air at 3000C to form X. X absorbs CO2 and forms Na2CO3 and Y. Which of the following is Y

Which of the following is not a peroxy acid

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

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

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.......

Hybridization at 2nd carbon in CH2 = CH – CH3 is

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

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

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):

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

If in a 100 mL of an aqueous HC1 of pH 1.00, 900 mL of more distilled water is added, the pH of the resultant solution will be :

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

Which of the following is an example of interstitial hydride

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:

 Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of A is

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

The heat of formation of HI from the equation H2+I2→2HI,ΔH=+52 KJ is

The heat of neutralization of strong acid and weak base 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

In the long form of periodic table, the elements having lowest ionisation potential are present in :

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

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

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

The chemical entities present in thermosphere of the atmosphere

For a given reaction which one is higher than the rest among the following

Aluminium reacts with NaOH and forms compound X. If the coordination number of aluminium in X is 6, the correct formula of X

The gas that is used for sterilizing water is

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

The method of separation of enantiomers from racemic mixture is known as

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

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 ?

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

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

Al3+ion has a lower ionic radius than Mg2+ ion because :

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

The weakest acid among the following is

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

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

The difference in ΔH and ΔE for the combustion of methane at 270C would 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)?

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:

H2-O2 fuel cell is