A to Z Exams

Exhausted permutit does not contain .... ion :

Which of the following pair of ions have same paramagnetic moment

X,Y,Z hydrocarbons molecular formula are CH4, C2H4, C2H2, these three are passed through porcelain tube containing ammonical cuprous chloride. The out coming gases would be

Which of the following statements is correct

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

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

An isomer of ethanol is

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

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

The value of Kc for the reaction N2+3H2 ⇔2NH3 depends on

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

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

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

Order of boiling points

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)

The decomposition of N2O5 → NO2+NO3 proceeds as a first order reaction, with a half-life period of 30 seconds at a certain temperature.The rate constant of the reaction is

Alcohol manufactured from water gas is

The charge required to reduce 1 mole Cr2O7-2 to Cr+3 ions is

Which of the following is not correct

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

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

Which one of the following compounds liberates CO2 from aqueous NaHCO3

The chemicals and the reaction conditions required for the preparation of ethane are

Which of the following statements is NOT correct?

148mg of Ca(OH)2 is required to remove hardness of one lit. of hard water by Clarke’s process. If hardness is due to only calcium bicarbonate, what is the degree of hardness of sample of water?

At 270C, 500 mL of helium diffuses in 30 minutes. What is the time (in hours) taken for 1000 mL of SO2 to diffuse under same experimental conditions ?

 Which of the following is not correct

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

The chemical formula of 'tear gas is :

......of a reaction cannot be determined experimentally:

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

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?

Which of the following pair of transition metal ions, have the same calculated values of magnetic moment

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

Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T) ?

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 )

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

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

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

In which of the following reactions the product is an ether

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

During electrolytic reduction of aluminia,the reaction at cathode is

The compound prepared by a substitution reaction of benzene is

In 0.01 M solution,HCN is 0.01% ionized. Its dissociation constant is

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

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

The molar capacity(Cp)of water at constant pressure is 75 J.K-1.mol-1.The increase in temperature (in K) of 100 g of water when 1 K.J. of heat is supplied to it is

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

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

Hybridisation of oxygen in diethyl ether 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 added to chloroform to slow down its aerial oxidation in presence of light ?

The formula of the product formed, when sodium thiosulphate solution is added to silver bromide 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 correct trends in the hydrides from Bi to N is

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

Helium mixed with oxygen is used in the treatment of:

In the hardening stage of plaster of paris, the compound formed is :

When 9.65 Coulombs of electricity is passed through a solution of AgN03 (atomic weight of silver 108), the amount of silver deposited is

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

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

Oxidation number of oxygen in OF2 is

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

What are the metal ions present in carnallite ?

The heat of formation of HI from the equation H2+I2→2HI,ΔH=+52 KJ is

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

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 is not correct

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

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

Which one of the following elements reduces NaOH to Na?

Bauxite is a mineral for the extraction of :

'Natalite' is used as

Which of the following is a linear molecule

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

The functional groups present in 'salol' are

Which of the following is not correct

The salt of phosphorous acid are called

In nuclear reactor, heavy water is used as a :

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

Which of the following is correct

Which one of the following reactions does not form gaseous product

The number of π bonds in the product formed by passing acetylene through dil.H2SO4 containing mercuric sulphate is:

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

Zn(s)+Cu+2(ag)→Cu(s)+Zn+2(ag)Given that ΔfG0 for Cu+2(ag) and Zn+2(ag) are +65.0 K.J.mol-1 and -147.2 K.J.mol-1 respectively then the standard Gibbs energy change for the above reaction is

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

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 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

Hydrolysis of chloroform with aqueous KOH gives finally

The number of primary alcoholic isomers with the formula C4H10O is

Method used for the concentration of tinstone ore is

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

Cuprous ion is colourless while cupric ion is coloured because :

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

Aniline is treated with NaNO2 and HCl at 00C,the product formed is:

The final product formed on the strong heating of H3BO3

Which of the following is not correct

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

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