Eamcet - Chemistry Test

Test Instructions :

1. The Test is 1hr duration.
2. The Test Paper consists of 30 questions. The maximum marks are 30.
3. All the questions are multiple choice question type with three options for each question.
4. Out of the three options given for each question, only one option is the correct answer.
5. Each question is allotted 1 mark for each correct response.
6. 0.25 will be deducted for incorrect response of each question.
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pH of pure H2O at 250C is

  

  

  

  

Observe the following statements :I.   Bleaching   powder   is   used   in   the preparation of chloroform.II.  Bleaching powder decomposes in the presence ofCoCl2 to liberate 02.III.Aqueous KHF2 is used in the preparation of fluorine.The correct combination is :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Which of the following reacts with ethanol to form chloroform

  

  

  

  

For the reaction A(g)⇔B(g)+C(g),Kp at 4000C is 1.5x10-4 and Kp at 6000C is 6x10-3 Then the incorrect statement is

  

  

  

  

Which of the following is not correct

  

  

  

  

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

  

  

  

  

The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

When ethyl alcohol reacts with bromine in the presence of alkali the compound formed

  

  

  

  

For the redox reaction Cr2O72+ + C2O42+ + H+ → Cr3+ + CO2 + H2O the correct coefficients of Cr2O72-, C2O42- and H+ in the balanced equation are

  

  

  

  

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

  

  

  

  

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

  

  

  

  

The solubility of LiOH in a solution of pH = 8 = is Ksp = 1.8 x 10-12

  

  

  

  

Which of the following contains a coordinate covalent bond ?

  

  

  

  

The gold numbers of three protective colloids A, B, and C are 0.05, 0.01 and 0.5 respectively. The decreasing order of their protective power is

  

  

  

  

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

  

  

  

  

The pH of a solution of H2O2 is 6.0, Some chlorine gas is bubbled into this solution. Which of the following is correct

  

  

  

  

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

  

  

  

  

The copper metal is mainly extracted from its

  

  

  

  

The number of structural alcoholic isomers for C4H10O 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

  

  

  

  

PH of a solution produced when aqueous solution of PH 6 is mixed with an equal volume of an aqueous solution oh PH is about

  

  

  

  

If the length of the unit cell is 5 Ao. the smallest distance in Ao between the two neighbouring metal atoms in a face centred cubic lattice is

  

  

  

  

The charge present onn one azide ion in columbs is

  

  

  

  

Which of the following reacts with benzene in presence of anhydrous aluminum chloride and forms acetophenone ?

  

  

  

  

Ordinary glass is a combination of the following

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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)

  

  

  

  

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?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Carbogen to

  

  

  

  

The value of Kp for the reaction 2AB(g)⇔2A(g)+B2(g) is 1.2x10-2 at 1065oC.The value of Kc for this reaction is

  

  

  

  

When X amperes of current is passed through molten AlCl3 for 96.5 second,0.09g of alumunium is deposited.What is the value of X

  

  

  

  

Which of the following compounds when heated with CO at 150"C and 500 atm pressure in presence of BF3 forms ethyl propionate ?

  

  

  

  

Which of the following is an example of interstitial hydride

  

  

  

  

In which of the following cases, the reaction is spontaneous at all temperatures

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Hybridisation of oxygen in diethyl ether is

  

  

  

  

The nature of forces operating between the adsorbate and the adsorbent in the adsorption occurring at high temperature is

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Assertion (A): the molecularity of reaction is a whole number other than zero , but generally less than 3 Reactions (R): the order of a reaction is always whole number

  

  

  

  

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

  

  

  

  

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

  

  

  

  

What are the metal ions present in carnallite ?

  

  

  

  

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 :

  

  

  

  

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

  

  

  

  

Atoms of different elements having identical mass are known as :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Anhydrous Magnesium chloride can be prepared by heating MgCl26H2O

  

  

  

  

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

  

  

  

  

 Which of the following is not correct

  

  

  

  

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

  

  

  

  

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

  

  

  

  

The molecular formula of potash alum is :

  

  

  

  

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

  

  

  

  

For the reaction H2(g)+I2(g)⇔2HI(g) at 721 K,the value of equilibrium constant KC is 50.The value of KP under the same conditions will be

  

  

  

  

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

  

  

  

  

The standard reduction electrode potential values of the elements A, B and C are +0.68V, -2.5V and -0.5V respectively. The order of their reducing power is

  

  

  

  

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

  

  

  

  

Equivalent conductance at infinite dilution,λ0 of NH4Cl,NaOH and NaCl are 128.0,217.8 and 109.9 ohm-1cm2eq-1 respectively. The equivalent conductance of 0.01N NH4OH is 9.30 ohm-1cm2eq-1,then the degree of ionization of NH4OH at this temperature would be(approximately)

  

  

  

  

Which one of the following reactions does not form gaseous product

  

  

  

  

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 equilibrium constant for the reactionSO2(g) + (1/2) O2(g) <====> SO3(g) is  5 x 10-2 atm  The equilibrium constant of the reaction2SO3(g)  <====> 2SO2(g) + O2(g) would be

  

  

  

  

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

  

  

  

  

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

  

  

  

  

The equilibrium constant for the reaction is 6.The initial concentration of each of CH3COOH and C2H2OH is two(mole/lit).What is the concentration of CH3COOC2H5 at equilibrium in moles /lit

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Calculate the emf of the cell   Cu (s) | Cu2+ (aq) || Ag+ (aq) | Ag (s)  GivenEoCu2+/Cu  = +0.34V ,  EoAg+/Ag  =0.80 V

  

  

  

  

Helium mixed with oxygen is used in the treatment of:

  

  

  

  

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 reagents and conditions convert benzene to chlorobenzene

  

  

  

  

Oxidation number of oxygen in OF2 is

  

  

  

  

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

  

  

  

  

Which of the following has S---S bond ?

  

  

  

  

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

  

  

  

  

The chemical formula of feldspar is

  

  

  

  

The first organic compound synthesized in the laboratory from an inorganic compound is:

  

  

  

  

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 one of the following salts give an acidic solution in water

  

  

  

  

The magnetic oxide of iron is

  

  

  

  

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

  

  

  

  

During electrolytic reduction of aluminia,the reaction at cathode is

  

  

  

  

Which of the following reacts with ammoniacal cuprous chloride

  

  

  

  

Given the bond energies of N = N, H — H and N—H bonds as 945, 436 and 391 kj/mol respectively, the enthalpy    of    the    reaction N2(S) + 3H2 (g) —> 2NH3(g) is :

  

  

  

  

AB is an ionic solid. The ionic radii of A+ and B- are respectively rc and ra. Lattice energy of AB is proportional to :

  

  

  

  

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

  

  

  

  

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