Question # 1

In the electrolysis of aqueous solution of sodium nitrate, the ions which are reduced at the cathode are

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H₃O⁺

Na⁺

OH^-

NO^3-

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having flouring trapped in it

Use a sorbent having Al₂O₃trapped in it

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

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H₂SO₄

Ni

Fe₂O₃

Al₂O₃

When a metal is dipped in 1 molar of its solution at 298 K. then potential set up is called

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Standard electrode potential

Electric charge

Ionization potential

Electroplating

Which of the following is not an example of addition polymer?

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Polyethene

Polystyrene

Neoprene

Terylene

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

Which reagent will distinguish a ketone from an aldehyde

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Br₂

2, 4-dinitrophenylhydrazine

NaBH₄

Tollen's reagent

Which of the following organic compounds exhibits positive Fehling test as well as iodoform test?

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Methanal

Ethanol

Propanone

Ethanal

When an alcohol reacts with SOCI₂an alkyl halide is formed. What are two other products

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SO₂and HCI

SI₂and H₂O

HCI and H₂O

H₂S and HCI

The % of CO₂is the atmosphere is

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3.0%

0.03%

0.3%

0.5%

The rate of reaction :

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Increase as the reaction proceeds.

Decreases as the reaction proceeds.

Remains the same as the reaction proceed.

May decrease or increase as the reaction proceeds.

Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same

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Empirical formula

Number of atoms in a molecules

Number of isomers

Relative molecular mass

Determination of atomic masses and invention of system of writing symbols was made by:

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J. Berzelius

Democritus

Dalton

None of above

Ifk_cof a reaction productis verylarge, it indicates that equilibrium occurs :

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With the help of a catalyst.

With no forward reaction.

At a low product concentration.

At a high product concentration.

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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dxy

dxz

dz²

dx²- y²

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Reversible reaction

Irreversible reaction

Spontaneous reaction

None of these

Given data

(i) heat of formation of CO₂is -393.7 KJ mole^-1

(ii) heat of formation of H₂O is -285.8 KH mole^-1

(iii) heat of combustion of CH_{4 is -890.00 KJ mole}^-1

Enthalpy of formation of methane from C and H₂is calculated by Hess's law by

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Adding i + ii + iii

Adding 2(i) and ii and subtracting iii

adding i + iii and subtracting ii

Adding i + 2(ii) and subtracting iii

The conversion of chemical energy into electrical energy requires :

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Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

Stainless steel contains ion and carbon along with

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Ni and Cr

Cr and Co

Co and Mn

Mn and Ni

The boiling point of glycerol is more than propanal because of

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Hybridisation

H-bonding

Resonance

All these factors

Alcohols of low molecular weight are

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Soluble in water

Soluble in water on heating

Insoluble in water

Insoluble in all solvents

Which of the statement is contrary to the first law of thermodynamics

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Energy can neither be created nor destroyed

One form of energy can be transferred into an equivalent amount of other kinds of energy

In an adiabatic process the work done is independent of its path

Continuous production of mechanical work without supplying an equivalent amount of heat is possible

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because

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NO₂makes the electron rich ring at ortho and para positions

NO₂withdraws electrons at metaposition

NO₂donate electrons at m-position

NO₂withdraws electrons at ortho and para position

The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is called

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Kolbe's reaction

Perkin's reaction

Sandmeyer's reaction

Schotten Baumann reaction

An electrophile may be

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Positive

Negative

Neutral

Both c and a

For a given process, the heat change at constant pressure (p) and constant volume (v) are related to each other as

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The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related

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pH = pKa

pH < pKa

pH > pKa

pH x pKa = 14

The tip of the funnel should touch the side of the beaker in order to avoid

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Splashing

Leakage

Mixing

Contamination

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d_x/d_tat any time is equal to

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k

Tangentθ

1/a, a is initial conc.

1/a²

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