A to Z Exams

Which of the following is an example of interstitial hydride

Solubility product of Ba(OH)2 and Al(OH)3 are 1.8x10-10 and 2.4x10-20 respectively.If both Al3+ and Ba+2 ions are present is a solution,which one will be precipated on addition of Ammonium hydroxide solution

5.85 gms of NaCl (Mol. wt. 58.5) is dissolved in water and the solution made up to 500ml; the molarity of the solution will be

The heat of formation of HI from the equation H2+I2→2HI,ΔH=+52 KJ 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 element that can exhibit highest number of oxidation states amongst the following:

Which one of the following compounds liberates CO2 from aqueous NaHCO3

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

Which of the following is a favourable factor for cation formation

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

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

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

Study the following table: Buffer solution Volume(in ml) of 0.M weak Volume(in ml) of 0.1 M sodium salt of weak acid I 4.0 4.0 II 4.0 40.0 III 40.0 4.0 IV 0.1 10.0 Which of the two sets of buffer solutions have least pH?

Which of the following is a biodegradable polymer

The correct trends in the hydrides from Bi to N is

Which one of the following salts give an acidic solution in water

Which one of the following reactions does not form gaseous product

In photoelectric effect, if the energy required to overcome the attractive forces on the electron,(work functions) of Li, Na and Rb are 2.41eV, 2.30eV and 2.09eV respectively, the work function of ‘K’ could approximately be in eV

What is the molecular formula of the product formed when benzene is reacted with ethyl chloride in presence of anhydrous aluminum chloride ?

Which of the following is called Rosenmund reaction?

In Freundlich adsorption isotherm, the intercept is equal to

The compound prepared by a substitution reaction of benzene is

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

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):

In the extraction of sodium by Down's process, cathode and anode are respectively:

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

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 half-life period of a radioactive element is 120 days. After 480 days 4.0 gm of the element will be reduced to (.....) gms.

The number of oxygen atoms bonded to one phosphorus atom in P4O6 is:

The flux used in the extraction of iron from Haematite in the blast furnace is

Which of the following pair of ions have same paramagnetic moment

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

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

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

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 ?

In nuclear reactor, heavy water is used as a :

CH3COOH ----LiAlH4--->  AA + CH3COOH ---H3O+ ----->  B + H2OIn the above reactions 'A' and 'B' respectively are

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

The number of primary alcoholic isomers with the formula C4H10O is

The hydronium ion concentration of a solution is 1X10-4 M at 250 C.The hydroxide ion concentration in the same solution is

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 ?

Among  the following, which is water insoluble

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

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 compounds is soluble in benzene but almost insoluble in water

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

Chemisorption involves

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

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

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

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

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

Dipole moment of HC1 = 1.03 D, HI = 0.38 D. Bond length of HC1 = 1.3 and HI = 1.6A .The ratio of fraction of an electric charge, δ, existing on each atom in HC1 and HI is

A sample of water contains 11.1 ppm of CaCl2 and 9.5 ppm of MGCl2 the hardness of water sample is

In the reaction AlCl3+Cl-→AlCl4-, AlCl3 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)?

Ethyl chloride reacts with sodium ethoxide to form a compound A. Which of the following reactions also yields A ?

1 mole of PCl5 is heated with 0.2 mole of chlorine in a one litre vessel till equilibrium is established. At equilibrium if 0.8 mole of chlorine in the vessel, the value of equilibrium constant for the dissociation of PCl5 is (in moles-lit-1)

In the extraction of copper, the slag formed in the blast furnace

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

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)

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

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

The following reactions is an example of ..... reaction. C2H4Br2→C2H2

The copper metal is mainly extracted from its

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

Which one of the following noble gases is used in miner's cap lamps

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

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 :

An isomer of ethanol is

The heat of neutralization of strong acid and weak base is

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

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 :

Electrons with a kinetic energy of 6.023 x 104 J/mol are evolved from a surface of a metal, when it is exposed to radiation of wavelength of 600 nm, The minimum amount of energy required to remove an electron from the metal atom is

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

Carbogen to

The salt of phosphorous acid are called

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

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

What is the correct order of spin only magnetic moment (in BM) of Mn2+, Cr2+ and V2+ ?

What is the volume (in litres) of oxygen required at STP to completely convert 1.5 mol of sulpher into sulpher dioxide

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

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

pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 ml of a buffer solution of acetic acid and Potassium acetate at 270C. The buffer capacity of the solution 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 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

The two sulphur atoms in Na2S2O3 have

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

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 of the following is obtained in carbyl amine reaction from aniline

Bond energy of Cl2,Br2 and I2 follow the order

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

If a solid is dispersed in a liquid the colloid is called

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

The energy of a photon is 3 x 10-12 ergs.What is its wavelength in nm ?( h = 6.62 x 10 -27ergs-s ; c = 3 x 10 10 cm/s )

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