A to Z Exams

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

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

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

Which of the following, compounds is the reactant in Rosenmund's reduction

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

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

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.

Method used for the concentration of tinstone ore is

Which one of the following statements is correct

At 270C the ratio of root mean square velocities of ozone to oxygen is :

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

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

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

H3O++OH-→2H2O

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

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

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

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

1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the Atomic weight of Cd

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

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 ?

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

Which one of the following elements reduces NaOH to Na?

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

A metal nitride contains 28% nitrogen by weight. The molecular formula of metal nitride is M3N2 What is the atomic weight of metal

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

For a reaction A+B→ products,the rate of the reaction was doubled.When the concentration of A was doubled.When the concentration of A and B were doubled.The order of the reaction with respect to A and B are

Nitro benzene on reduction with zinc and NH4CI gives

Which of the following is not tetrahedral

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

Increasing the conc. of the reactant by 27 times, the rate increases by 3 times. What is the order of the reaction?

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

Which of the following brings about dry bleaching

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)

Average C-H bond energy is 416 kJ. mol-1. Which of the following is correct ?

Meta-phosphoric acid is represented by

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

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

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

An organic compound X on treatment with pyridinium chloro chromate in dichloromethane gives compound 'Y". Compound Y reacts with I2 and alkali to form triiodomethane. The compound 'X' is

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

Which one of the following is a secondary alcohol ?

Observe the following reaction2A + B → CThe rate of C is 2.2 x 10-3 mol L-1 min-1.What is the value of - d[A]/dt (in mol. L-1min-1)

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

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

Identify the correct order in which the covalent radius of the following elements increasesI. TiII. CaIII. Sc

One atom of 3919K contains:

In dry cell cathode is

The average kinetic energy of one molecule of an ideal gas 270C and 1 atm. pressure is

The rate of gaseous reaction is give by k[A][B].If the volume of reaction vessel is reduced to 1/4 of initial volume the reaction rate relative to the original rate is

Bhopal gas tragedy of 1984 was caused by

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

A moving electron has 4.55 x 10-25 joules of kinetic energy. The wavelength of the electron is (mass = 9.1 x 10-31 kg and h = 6.6 x 10-34 kg m2 sec-1)

The correct structure of 4-bromo 3-methyl-but-1-ene:

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

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

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

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

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

5 moles of acid is required to change the pH of 1 litre of buffer by 2units.Find buffer capacity.

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 not correct

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

Which of the following statements is NOT correct?

The   IUPAC    name    of   the    compound(CH3)2CH-CH=CH-CHOH-CH3 is

Which of the following does not participate in carbylamine reaction?

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

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

Which of the following is an example of interstitial hydride

The two sulphur atoms in Na2S2O3 have

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

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 the cathodes will be in the ratio of

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

A radioactive substance 88X228 (IIA) emits 3α and 3β particles to form "Y". To which group of long form of the periodic table does "Y" belong

Hydrolysis of trichloro methane with aqueous KOH gives

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 ?

The rate of the reaction at 400C is 5 units.The rate of same reaction at 800C is nearly(temperature coefficient)

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

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

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

The atomic numbers of elements X, Y and Z are 19, 21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order

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

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

The final product formed on the strong heating of H3BO3

Which of the following is not correct

The following is a reversible reaction

Bond energy of Cl2,Br2 and I2 follow the order

How many electrons are present in the M shell of an atom of an clement with atomicnumber 24 (Z = 24) ?

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

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

The compound prepared by a substitution reaction of benzene is

If ΔE is the heat of reaction for C2H5OH(1)+3O2(g)→2CO2(g)+3H2O(l) at constant volume,the ΔH(Heat of reaction at constant pressure)at constant temperature is

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

Bauxite is a mineral for the extraction of :

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

The charge present onn one azide ion in columbs is

If 20 mL of 0.4 N NaOH sol ution completely neutralised 40 mL of a dibasic acid, the molarity of the acid solution is :

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

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