Question # 1

Which substances haveΔH =ΔE

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Solids

Liquids

Gases

Liquids and solids

Which one of the following is not a nucleophile

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H₂O

H₂S

BF₃

NH₃

Which has greater number of moles

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0.1 g sodium

6.02 x 10²⁰atoms of magnesium

20 cm³0.1mole per dm³of NaOH

12.2 dm³of nitrogen at standard

[A_rNa = 23, Mg = 24, O = 16]

Metals like Fe, Mg, Al, Cr, Zn have more negative reduction potentials that is whey

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These don't react with steam

These react very slowly with steam to liberate H₂gas

These react rapidly with steam to produce the metallic oxides and liberate H₂gas

These react with cold water violently

Coupling of Pb with its Pb⁺⁺/Pb = -0.13 V and Ag with Ag⁺/ Ag = +0.80 V, the cell reaction

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The less reactivity of transition metal is due to

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High heats of sublimation

High ionization energies

Low heats of salvation

All these

10g of NaOH has been dissolved per kg of solvent. The molality of solution is :

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.25 m

1.5 m

.5 m

2.5 m

Oxidation of methyl alcohol gives

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Formaldehyde

Acetone

Ester

Acid

In exothermic reversible reaction increase in temperature shift the equilibrium to :

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Remains unchanged.

Product side.

Reactant side.

None of above.

Grignard reagent is not prepared in aqueous medium but prepared in ether medium because

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The reagent is highly reactive in ether

The reagent does not react with water

The reagent becomes inactive in water

The reagent reacts with water

The heat energy change during a chemical reaction at constant pressure and at a given temperature is called

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Change in internal energy

Enthaply change

Temperature change

Work done by the system

17.1 grams sucrose (C₁₂H₂₂O₁₁) dissolved in 250 cm³of solution. This has molarity

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0.1 M

0.2 M

0.01 M

0.02 M

The solutions of NaCl and KCl are prepared separately by dissolving same amount of solute in water, which of the following statements is true fro these solutions ?

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KCl solution will have higher boiling point than NaCl solution.

Both the solutions have same boiling points.

KCl and NaCl solutions possess same vapour pressure.

KCl solution possesses lower freezing point than NaCl solution.

Coal is obtained from dead remains of

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Plants

Animals

Both a and b

None

Gypsum is a common mineral of

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Magnesium

Strontium

Calcium

Barium

Which of the following charge

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Li

Be

H

He

Aledehydes ketones can be prepared form alcohols by their:

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Reduction

Oxidation

Decomposition

Synthesis

The natural fertilizers consist of

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Plants

Animals

Both plants and animals

Microorganisms

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d²,4s²,4p¹

Stainless steel contains Cr upto

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12%

18%

10%

5%

Which can be used for dehydration of alcohol

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P₄O₁₀

H₂SO₄

H₃PO₄

All of them

The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

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Order of reaction can determined by an experiment

Order of reaction can determined from a balance equation only.

Order of reaction can determined increases by increasing temperate.

Order of reaction must be in whole number and not in fraction.

The value of K_pis greater than K_cfor a gaseous reaction when

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Number of molecules of products is greater than the reactants

Number of molecules of reactants is greater than those of products

Number of molecules of reactants and products equal

Catalyst is added

With amino acids ninhydrin solution gives

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Blue

Violet

Bluish violet

White

Cotton is ______% cellulose

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90

100

99

30

Tetraethyle lead causes disease:

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Typhoid

Respiratory

Stomach

Muscular

Best medhod of preparation of alkyl halide from alcohals is by its reaction with:

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HX

SOCl₂

Px₅ and PX₃

All

A phtotographic plate is coated with an emulsion of silver nitrate and

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AgCI

AgI

AgBr

NaNO₃

Which of the following is an ortho-para directing group

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Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

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0.282

0.0796

0.0199

1.99

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

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