A to Z Exams

Assertion(A): A catalyst has no effect on the state of equilibrium Reason:A catalyst influences the rates of both forward and backward reactions to the same extent

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

The hydrolysis constant Kh of a salt of NaOH and a weak acid (HX) If the Ka of the acid is Ka=2x10-6

'Natalite' is used as

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

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

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

A sample of gas has a volume of 0.2 lit. measured at 1 atm. pressure and 00C. At the same pressure, but at 2730C its volume will become

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

The molecule having zero dipole moment is:

Liquid benzene burns in oxygen according to 2C6H6(l)+15O2 (g)→12CO2 (g)+6H2O(l) .How many litres of oxygen are required for complete combustion of 39 gms.Of liquid C6H6

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

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

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

pH of pure H2O at 250C is

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)

∆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

The type of bonds present in sulphuric anhydride

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

Identify the reaction for which ΔH ≠ ΔE :

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)

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

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

When compound X is oxidised by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAlH4 gives X. X and Y respectively are :

75 ml of 0.2 M HCl is mixed with 25 ml of 1 M HCl. To this solution, 300 ml of distilled water is added. What is the pH of the resultant solution

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

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

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

If a reaction obeys the following equation. K=2.303/t log10a/a-x, the order of the reaction will be

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

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

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

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

Which one of the following equation is correct for the reaction N2(g)+3H2(g)→2NH3(g)

The equilibrium constant for the reaction H2(g)+I2(g)⇔2HI(g) is 81 at a certain temperature.If the concentrations of H2 and I2 are 3mole.lit each at equilibrium,the equilibrium concentration of HI is

Which one of the following reactions does not form gaseous product

The correct order of reducing abilities of hydrides of V group elements is

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

Which one of the following compounds liberates CO2 from aqueous NaHCO3

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

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide ?

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

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

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

Ethylene reacted with bromine in CCl4 to form X. When X is reacted with alcoholic KOH, Y is formed. X and Y are respectively :

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

The amount of electricity that can deposit 108gm of silver from AgNO3 solution 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

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

The molarity of pure water is:

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

In a first order reaction,50 minutes time is taken for the completion of 93.75% of a reaction. Half life of the reaction is

Which of the following reacts with ethanol to form chloroform

9.8 g of H2SO4is present in two litres of a solution.The molarity of the solution is:

The Kc for the reaction A+B↔C is 4 and Kc for 2A+D↔C is 6. The value of Kc for C+D↔2B is

Exhausted permutit does not contain .... ion :

The chemical entities present in thermosphere of the atmosphere

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

Which of the following functional group shows +R effect

The bonds in K4Fe(CN)6 are:

which of the following is not correcr?

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

The rate equation for the reaction A+2B→products is rate=K[A][B]2. If the volume of the vessel is decreased to half of the initial volume the reaction rate bears the following relation to the original rate

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.......

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

The r.m.s. velocity of an ideal gas at 300 K is 12240 cm/sec. What is the most probable velocity at that temperature?

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

An isomer of ethanol is

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 correct trends in the hydrides from Bi to N is

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

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

Which of the following brings about dry bleaching

Which of the following is not a lipids

Which of the following pairs of ions are colourless ?

Bhopal gas tragedy of 1984 was caused by

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)

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

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

In which of the following reactions the product is an ether

The value of Kp for the reaction 2H2S(g)⇔2H2(g)+S2(g) is 1.2 x 10-2 at 10650C.The value of KC for the reaction is

Which of the following statements is not correct ?

The addition of HCl will not suppress the ionization of

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

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

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

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 ?

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 :

Which of the following is an endothermic reaction ?

Which of the following set of variables give a straight line with a negative slope when plotted ?(P - vapour pressure, T = Temperature in K)

Identify 'acetaldoxime'

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

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

Gold number is used to show

H3O++OH-→2H2O

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

138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

The half-life period of a radioactive substance is 150 days. Starting with an initial quantity of 1 mg of the substance the fraction of that has disintegrated in 600 days 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)