Question # 1

Which is the transition element among the following

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B

Al

Cu

Cs

Which of the following is not true for metalloids

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They are borderline elements that exhibit both metallic and non-metallic properties to some extent

They usually act as electron donors with non-metals and as electron acceptors with metals

Some of these elements are boron, silicon and germanium

They are good conductors of heat and electricity

In the periodic table, the element with atomic number 16 will be placed in the group

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Fourteen

Sixteen

Thirteen

Fifteen

The amount of energy required to remove an electron from an atom of an element in the gaseous state is called

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Electron affinity

Electronegatively

Ionization energy

None of these

Among O, C, F, Cl, Br, the correct order of increasing radii is

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F O C Cl Br

F C O Cl Br

F Cl Br O C

C O F Cl Br

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

The correct order of 2nd l.P. of C,N,O and F is

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O > F > N > C

O > N > F > C

C > N > O > F

F > O > N > C

Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be

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Ionic

Covalent

Coordinate

Metallic

Which has highest 1st I.E.

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Br

Cl

F

l

Which element should have the greatest value for electronegativity when combined with hydrogen

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Na

Si

S

Cl

The valence shell electronic structure of an element is ns²np⁵. The element will along to the group of

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Alkali metals

Inert metals

Noble gases

Halogen

Eka-aluminium and Eka-silicon are known as

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Gallium and Germanium

Aluminium and silicon

Iron and sulphur

Proton and silicon

The elements of f-block are also known as

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Inner-transition

Outer transition

Normal elements

Alkaline earth metals

Which of the following is most electronegative?

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Carbon

Silicon

Lead

Tin

Transition elements have valence electrons in

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s-orbital

p-orbital

d-orbital

f-orbital

The classify the elements, Newland gave the idea of

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Octaves

Triads

Atomic volume

Atomic mass

Number of elements present in 5th period is

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8

18

32

24

Indicate the correct statement

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All lanthanidees are present in the same group

All halogens are present in the same period

All the alkali metals are present in the same group

All the noble gases are present int he same period

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

Which of the following isoelectronic ions has the lowest ionization energy?

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K⁺

Ca²⁺

Cl^-

S^2-

How does the ionization energy of 1st group elements vary?

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Increases down the group

Decreases down the group

Remains unchanged

Variation is not regular

From left to right, atomic radii of transition elements

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Increases

Decreases

Remain same

None of the above

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

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The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺

NH₄Cl dissociates less fully than NaCl

The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons)

The ion NH⁺₄acts as an acid

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

Which species represented by the following formula has the largest radius

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P^3-

Cl^-

A_r

K⁺

The lA elements are called

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Alkaline earth metal

Alkaline metals

The halogens

The inert gases

The oxides of electronegative elements are

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Basic

neutral

Acidic

Amphoteric

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

The valency of noble gases, in general, is

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Zero

One

Three

Two

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