A to Z Exams

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

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

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

consider the following reaction equilibrium 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

Assertion(A): The molecularityof reaction is a whole number other than zero, but generally less than 3. Reason(R): The order of a reaction is always a whole number

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

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

The compound prepared by a substitution reaction of benzene is

Anhydrous Magnesium chloride can be prepared by heating MgCl26H2O

Which of the following is not an air pollutant

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

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

For the reaction 2SO2(g)+O2(g)2SO3(g) taking place in one litre vessel, the number of moles of SO2 ,O2,SO3 at equilibrium are 2,1 and 2 moles respectively, under a total pressure of 15 atm.The Kp of the reaction is

Which one of the following elements reduces NaOH to Na?

Which of the following is not tetrahedral

Dry distillation of calcium acetate and calcium formate forms:

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

What are the metal ions present in carnallite ?

An organic compound X on treatment with pyridium dichromate in dichloromethane gives compound Y.Compound Y reacts with I2 and alkali to form idoform.The compound X is

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

Which one of the following order is correct for the first ionization energies of the elements

Hydrolysis of trichloro methane with aqueous KOH gives

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 :

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

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:

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

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

The weight in grams of a non-volatile solute (M.wt:60) to be dissolved in 90 g of water to produce a relative lowering of vapour pressure of 0.02 is

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 electrolytic conductance of 0.01 M solution of acetic acid is 0.000163 Scm-1 at 298k. The % of dissociation of acetic acid at 298K.Given Am0 of acetic acid =390.7 Scm-2/mole at 298K.

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

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 of the following is not correct

pH of pure H2O at 250C is

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)

While phosphorus form PCl5, nitrogen does not form NCl5 because

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

Consider the two gaseous equilibria involving SO2 and the corresponding equilibrium constants at 298K SO2(g)+1/2O2(g)⇔SO3(g);K1 2SO3(g)⇔2SO2(g)+O2(g);K2 The values of the equilibrium constants are related by

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

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

The final product formed on the strong heating of H3BO3

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 is called Rosenmund reaction?

Which one of the following compounds liberates CO2 from aqueous NaHCO3

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

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

Conjugate base of H2SO4 is

In aqueous solutions H2O2 oxidises H2S to

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

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

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

Among  the following, which is water insoluble

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

 Which of the following is not correct

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

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

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 not correct

The functional groups present in 'salol' are

The chemical entities present in thermosphere of the atmosphere

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

Bauxite is a mineral for the extraction of :

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

During electrolytic reduction of aluminia,the reaction at cathode is

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

Which one of the following is a secondary alcohol ?

The heat of neutralization of strong acid and weak base is

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

The froth floatation process is used for the concentration of

The type of bonds present in sulphuric anhydride

In lime kiln the reaction CaCO3(s)⇔CaO(s)+CO2(g)

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

Which of the following is not correct

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 )

Carbogen to

CFCl3 is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen ?

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

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

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

During the electrolysis of cyrolite,aluminium and fluorine are formed in.......molar ratio

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 total pressure of a mixture of 6A of O2 and 5.6 g of N2 present in a 2 litre vessel is 1200 mm. What is the partial pressure (in mm) of nitrogen?

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

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

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

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

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

The magnetic oxide of iron is

Which of the following reactions can produce aniline as main product

Bhopal gas tragedy of 1984 was caused by

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

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

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

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

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

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

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

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