Question # 1

An ionic compound X + Y - is most likely to be formed if

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Ionization enthalpy of X is high electron gain ethalpy of Y is low

Ionization enthalpy of X is high electron gain enthalpy of Y is high

Ionization enthalpy of X is low,electron gain enthalpy of Y is low

Ionization enthalpy of X is low electron gain enthalpy of Y is high

Aluminium does not corrode as does iron because.

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AI does not react with O2

a-protective layer of Al2O3 forms on the metal surface

AI is harder to oxidize than is Fe

Fe gives chathodic protection to AI

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

Which is the strongest reducing agent.

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HF

HCl

HBr

HI

The maximum covalence of an element equal to.

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The number of unpaired d electrons

The number of paired p electrons

The number of unpaired a and P electors

The actual number of a and P electrons in the outermost shell

Which one of the following sets of elements has the strongest tendency to form negative ions in gaseous state.

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NA, Mg, Al

Ca, V, Cr

N , O, F

Ga, ln, tI

Which of the following hydroxides has the maximum solubility in water.

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Mg (OH)2

Ca (OH)2

Sr (OH)2

Ba (OH)2

The first ionization energies of the elements of the first transition series. (Ti _____ Cu)

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Increases as the atomic number increases

decreases as the atomic number increases

Do not show any change as the addition of electrons takes place in the inner (n-1) d -orbitals.

Increases from Ti to Mn and then decreases from Mn to Cu

The attraction which exists between carbon dioxide molecules in solid carbon dioxide is due to.

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Van der Waal's forces

Molecule ion forces

ionic bonds

hydrogen bonds

Non localised bonds are referred as

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Metallic bond

Long range bonds

Ionic bond

Covalent bonds

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

When two atoms of hydrogen combine to form a molecule of hydrogen gas the energy of the molecule.

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higher than that of the separate atoms

Equal to that of the separate atoms

Lower than that of the separate atoms

Sometimes lower and sometime higher.

In the electrolysis of alumina, cryolite is added to.

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Lower the melting point of alumina

Increase the electric la conductivity

Minize anodize affect

Remove impurites from alumina

Compounds formed when noble gasses get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are called.

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Interstitial compounds

Hydrates

Clathrates

Picrates

Hydrogen at the moment of its generation is generally called.

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Protium

Nascent hydrogen

Atomic hydorgen

Heavy hydrogen

The hybridization of sulphur in sulphur dioxide is.

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sp

sp2

sp3

dsp2

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

H2SO4 acts as gent

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Reducing

Oxidizing

Both A and B

None of above

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

The correct order of ionization energies of alkali metals is.

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Li > Na > K > Rb

Na > K > Rb > Li

Rb > K > Na > Li

Rb > K > Li > Na

A boy accidently splashes a few drops of conc. H2SO4 on his cotton shirt. A few minutes later, the splashed part blacken and holes appear.This is because the sulphuric acid.

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Heats up the cotton so that it burns

Dehydrates the cotton

Causes cotton to react with oxygen of the air

Removes the elements of water from cotton

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