A to Z Exams

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1 : 4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?

Meta-phosphoric acid is represented by

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

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

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

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

28g of N2 and 6g of H2 were mixed initially .At equilibrium 17g of NH3 was formed.The weight of N2 and H2 at equilibrium are respectively

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

Order of boiling points

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 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

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

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

Ultrapure elements are obtained in the following method of metal refining

The active mass of 5.6 litres of O2 at STP is

A certain sample of gas has a volume of 0.2 litres measured at 1 atm. pressure and 00 C. At the same pressure but at 273 0c. Its volume will be

Hydrolysis of sucrose with dilute aqueous sulphuric acid yields

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

Which of the following is used for making optical instruments ?

The charge present onn one azide ion in columbs is

Hybridisation of oxygen in diethyl ether is

Ordinary glass is a combination of the following

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

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

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 used in the preparation of generated water (soda)

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

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

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

Which of the following is an endothermic reaction ?

3.42g of substance of molecular weight 342 is present in 250g of water.Molality of this solution 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

In the Dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173K. Which one of the following gaseous mixtures is not adsorbed on to the charcoal ?

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 ?

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

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

The two sulphur atoms in Na2S2O3 have

The chemical formula of feldspar is

Which of the following contains a coordinate covalent bond ?

Which of the following is a linear molecule

Calorific value of producer gas is low because of

When a sample of gas expands from 4.0L to 12.0L against a constant pressure of 0.30 atm, the work involved is (1L ATM=101.35 J)

A solution of concentration "C" g equiv/litre has a specific resistance R, The equivalent conductance of the solution is

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

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

The transition temp.at which rhombic sulphur becomes monoclinic sulphur is

The numbers of unit cells present in 5.85mg of NaCl crystal are

The chemical entities present in thermosphere of the atmosphere

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 number of structural alcoholic isomers for C4H10O 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

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

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

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

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

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

Gold number is used to show

Aniline when heated with NaNO2 and HCl at 0.50C the product formed is:

Nitro benzene on reduction with zinc and NH4CI gives

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, compounds is the reactant in Rosenmund's reduction

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

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

Anhydrous Magnesium chloride can be prepared by heating MgCl26H2O

 Which of the following is not correct

If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0D respectively,what is the percent ionic character of the bond

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 an air pollutant

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

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

In the reaction AlCl3+Cl-→AlCl4-, AlCl3 is

The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

The equilibrium constant Kp for the reaction 2SO2+O2⇔2SO3 is 2.5 atm-1.What would be the partial pressure of O2 at equilibrium. If the equilibrium partial pressures of SO2 and SO3 are equal

Which of the following pair of ions have same paramagnetic moment

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

A radio isotope has a half life 10 days.If today there is 125g of it left,what was its weight 40 days earlier?

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

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

The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively

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

The first organic compound synthesized in the laboratory from an inorganic compound 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)

Which one of the following is a secondary alcohol ?

The molecule having zero dipole moment 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)

Observe the following statements :I.    The physical and chemical properties of elements are periodic functions of their electronic configuration.II.    Electronegativity of fluorine is less than the electronegativity of chlorine.III.   Electropositive nature decreases from top to bottom in a group.The correct answer is :

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

Dry distillation of calcium acetate and calcium formate forms:

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)?

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

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

Method used for the concentration of tinstone ore is

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

The heat of formation of SO2(g) is -297.8 kJ mol-1.The enthalpy change in the decomposition of 1 mole SO2(g) to its constituent elements is

The most abundant group of lipids and animals is

Assertion (A): The PH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8  (pKa of acetic acid is 4.8)Reason (R): The ionic product of water at  250C is l0-14 mol2 .L-2. The correct answer is

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

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