Question # 1

In the modern periodic table the elements are placed in the ascending order of their

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Atomic masses

Melting points

Boiling points

Atomic numbers

The elements of sub-group A are called

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Transition elements

Main elements

Typical elements

Rare earth elements

Gradation in properties in the periods of periodic tables are due to change in

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Atomic weight

The number of electrons

Number of protons

Electronic configuration

Mark the correct statement

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Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

Of the given alkali metals, the one with smallest size is

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Rb

Cs

K

Na

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

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

Transition elements have valence electrons in

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s-orbital

p-orbital

d-orbital

f-orbital

Which of the following sets of atomic numbers belong to that of the alkali metals?

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1,12,30,4,62

37,19,3,55

9,17,35,53

12,20,56,88

Number of elements in the first period of the periodic table are

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Two

Four

One

Eight

NaH is

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Ionic hydride

Complex hydride

Covalent hydride

Interstitial hydride

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

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

According to Mendeleev, the properties of the elements are periodic function of their

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Atomic number

Atomic volumes

Atomic masses

Atomic densities

Which of the following elements should be the least metallic in character

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Rb

ln

Te

l

Which of the following does not exhibit the periodicity in properties of the elements?

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Ionisation energy

N/P ratio

Electronegativity

Atomic radius

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

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 most electronegative?

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Carbon

Silicon

Lead

Tin

The electropositive elements from

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Acidic oxides

Basic oxides

Neutral oxides

None

The elements of group lA are called

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Chalocogens

Halogens

Alkali metals

Alkaline earth metals

Which of the following metal requires radiation of highest frequency to cause emission of electrons?

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Na

Mg

K

Ca

An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element

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Sodium

Aluminium

Silicon

Phosphorus

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

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The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding constant

Rare earth elements are

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s-block elements

p-block elements

d-block elements

f-block elements

The most distinctive character among the elements is their division into

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Metals and non-metals

Solids, liquids and gases

Atoms and molecules

Active and inactive elements

Which of the following species has the highest ionization potential?

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Ne

Al⁺

Mg⁺

Li⁺

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

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

Which is the most volatile compound

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Hl

HCl

HBr

HF

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ECAT Chemistry Chapter 12 Periodic Classification of Elements and Periodicity Online Test MCQs With Answers

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