A to Z Exams

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 chemical formula of feldspar is

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

The equilibrium constant for the reaction is 6.The initial concentration of each of CH3COOH and C2H2OH is two(mole/lit).What is the concentration of CH3COOC2H5 at equilibrium in moles /lit

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

One mole of N2H4 loses 10 moles of electrons to form a new compound Z.Assuming that all the nitrogens appear in the new compound, what is the oxidation state of nitrogen in Z? (There is no change in the oxidation state of hydrogen)

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)

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

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):

The charge present onn one azide ion in columbs is

When a copper wire is dipped in a aqueous AgNO3 solution, the solution turns blue,The reason for this is

The conjugate base of HSO4- ion 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 is not correct

Which of the following compounds answer positively carbyl amine test? A) C6H5NHCH3 B) CH3-C6H6-NH2 C) C6H6-NH2 D) C6H6-NH (CH3)2

The standard reduction potentials of Zn2- | Zn, Cu2+| Cu and Ag+| Cu and Ag+| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :1) Zn | Zn 2+||Cu 2+| Cu2) Zn | Zn 2+||Ag +| Ag3) Cu | Cu 2+||Ag +| Agwhat is the correct order of Eocell of these cells?

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

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

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

The hemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight. The molecular weight of hemoglobin as 67200.the number of iron atoms in each molecule of hemoglobin is (atomic weight of iron = 56)

Active mass of 56 g of N2 contained in 2 ltr.Flask is

The number of sigma and pi (π) bonds present in benzene respectively are :

At 270C, 500 mL of helium diffuses in 30 minutes. What is the time (in hours) taken for 1000 mL of SO2 to diffuse under same experimental conditions ?

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

Oxidation number of oxygen in OF2 is

One atom of 3919K contains:

Which one of the following pairs of reactants does not form oxygen when theyreact with each other

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?

What is the hybridization state of the central atom in the conjugate acid of NH3?

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

The solubility of AgCl in NaCl solution is less than that in pure water,because

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

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

"Fluorosis" disease is caused due to the reaction of ________ with excess of fluoride in the body

Which of the following is correct

The number of π bonds in the product formed by passing acetylene through dil.H2SO4 containing mercuric sulphate is:

The two sulphur atoms in Na2S2O3 have

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

The type of bonds present in sulphuric anhydride

Which of the following is used for making optical instruments ?

The bonds in K4Fe(CN)6 are:

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

Hybridisation of oxygen in diethyl ether is

Which one of the following is a secondary alcohol ?

Which of the following is not a lipids

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

Dry distillation of calcium acetate and calcium formate forms:

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

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

A cylinder of gas contains 14.5 kg of butane. If a family needs 2.5x104 KJ of energy per day for cooking. Hoe long will the cylinder last. (Enthalpy of combustion of butane=2600 KJ/mole)

The number of sigma and pi bonds in peroxodisulphuric acid are, respectively

The half-lives of two radioactive nuclides A and B are 1 and 2 min respectively. Equal weights of A and B are taken separately and allowed to disintegrate for 4 min. What will be the ratio of weights of A and B disintegrated

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

Which of the following is used in the preparation of generated water (soda)

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

Which of the following is an example of interstitial hydride

Which of the following reactions can produce aniline as main product

Carbogen to

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

Hydrolysis of chloroform with aqueous KOH gives finally

The vapour pressure of water at 230C is 19.8 mm. 0.1 mole of glucose is dissolved in 178.2 g of water. What is the vapour pressure (in mm) of the resultant solution

Which of the following is obtained in carbyl amine reaction from aniline

Among the following compounds which have more than one type of hybridization for carbon atom 1) CH3CH2CH2CH3 2) CH3CH= CHCH3 3) CH2= CH-CH=CH2 4) H-C=C-H

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

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)

Chemisorption involves

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

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

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

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

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

Which of the following reacts with benzene in presence of anhydrous aluminum chloride and forms acetophenone ?

∆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

A sample of 100ml water required 0.294mg of K2Cr2O7(mol.wt=294)for oxidizing dissolved organic compounds in it. The C.O.D of water sample is

Which of the following pair of ions have same paramagnetic moment

Which of the following reagents and conditions convert benzene to chlorobenzene

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

The order of decrease in atomic radii for Be;Na;Mg is

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

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

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

The olefin which on ozonolysis gives CH3CH2CHO and CH3CHO 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

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:

An isomer of ethanol is

In dry cell cathode is

An organic compound containing C and H has 92.3% of carbon, Its empirical formula is:

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

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

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

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 :

Which of the following statements is correct

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

Which one of the following sets correctly represent the increase in the paramagnetic property of the ions

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

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

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

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