Question # 1

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.

The rusting of iron is catalyzed by which of the following.

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Fe

H+

O2

Zn

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

Which one of the following statement is incorrect in relation to ionization enthalpy.

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Ionization enthalpy increase for each successive electron

The greatest increase in ionization enthaly is experienced on removal of electron from core noble gas configuration

End of the valence electron is marked by a big jump in ionization enthalpy

Removal of electron from orbitals bearing lower value to easier than from orbital having highest n value.

The interactions in HF are.

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dipole dipole interasctions

Hydrogen bonds

dipole -dipole and dispersion forces

Hydrogen bond and diapersin forces

Is a peroxy acid

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H2SO5

H2S2O6

H2SO4

H2S2O7

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

Group IV A consist elements.

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3

4

5

6

Which of the ionic possesses highest bond energy.

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C-C

Si -Si

Ge - Ge

Sn -Sn

Ten elements Sc (Z = 21) to Zn (Z = 30) fill their 4s orbitals first and then 3d orbitals are called elements. of.

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3 d series.

4d Series

5d Series

None of above

Which of the following is not an ore of nickel.

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Pentalandite

Siderite

Garnierite

Nicollite

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

Stable metal ions strictures are.

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Noble gas structure

Is electron group structure

Transition metal in structure

All of the above

The noble gas used or treatment of cancer is

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Helium

Argon

Radon

Krypton

Reacts violently with water

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AlH3

AlCl3

Lia IH4

Al2Cl6

Which of the elements of group II A has the highest value of IE.

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Mg

Be

Ca

Sr

The lightest alkali metal is.

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Lithium

Sodium

Rubidium

Caesium

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

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

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Higher than that of separate H atoms

Equal to that of separate H atoms

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H.

Which of the following have identical bond order.

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CN- and O2-

CN - and NO+

O2- and CN+

NO+ and CN+

The compound insoluble in acetic acid is.

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Calcium oxide

Calcium carbonate

Calcium oxalate

Calcium hydroxide

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