Question # 1

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

Gradual addition of electronic shells in the nobel gases causes a decrease in their

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Ionization energy

Atomic radius

Boiling point

Density

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

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

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

Rare earth elements are

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s-block elements

p-block elements

d-block elements

f-block elements

Ionization potential increases in moving from left to right in a period

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Because nuclear charge increase

Because atomic size decrease

Both (a) and (b)

Because atomic size increases

Which is true about the electronegativity order of the following?

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P > Si

C > N

Br > Cl

Sr > Ca

NaH is

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Ionic hydride

Complex hydride

Covalent hydride

Interstitial hydride

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

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

The oxides of electronegative elements are

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Basic

neutral

Acidic

Amphoteric

Which of the following elements have the largest radius

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F

Cl

Br

l

The chloride of element Q is hydrolysed by water to form an acidic solution and its oxide reacts with acid to form a salt.

What cold be the element Q

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Magnesium

Aluminium

Silicon

Phosphorus

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

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

Who gave the concept of atomic number

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Newton

Mosley

Dalton

Newland

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

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

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

In the modern long form of the periodic table elements are arranged in the increasing order of

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Atomic mass

Atomic number

Mass number

Isotopic number

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

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Rb

ln

Te

l

Each vertical column of the periodic table includes elements with chemical characteristics that are in general

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Identical

Similar

Different

Similar as well as different

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

The electropositive elements from

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Acidic oxides

Basic oxides

Neutral oxides

None

Number of elements present in 5th period is

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8

18

32

24

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

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

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

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