Question # 1

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

What is the nature of Al₂O₃

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Acidic

Basic

Amphoteric

Neutral

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

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Which is true about the electronegativity order of the following?

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P > Si

C > N

Br > Cl

Sr > Ca

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 with atomic numbers 9, 17, 35, 53, 85 an all

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Noble gases

Halogens

Heavy metals

Light metals

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

Keeping in view the size of atoms, which order is the correct one

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > l

The oxides of which of the following elements will be acidic in character

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Mg

Rb

Li

Cl

The valency, ionization energy and electrongativity of elements are related to its

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Atomic number

Properties

Atomic weight

Family group

Which among the following elements have lowest value of IE₁?

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Pb

Sn

Si

C

From ₃₉Y to ₄₈Cd are called

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Transition elements

Outer transition elements

Inner transition elements

2nd transition series

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

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

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K⁺

Ca²⁺

Cl^-

S^2-

Which of the following statement about fluorine is not correct?

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Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Fluorine does not form oxoacid

The number of elements in the first, second and third period are

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2, 8, 18

8, 2, 18

2, 18, 8

2, 8, 8

From left to right, atomic radii of transition elements

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Increases

Decreases

Remain same

None of the above

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

The oxides of electronegative elements are

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Basic

neutral

Acidic

Amphoteric

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

Which is the transition element among the following

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B

Al

Cu

Cs

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

Which of the following is a member of -block

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Zn

Al

B

Br

Doberiner arranged the similar elements into

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Pairs

Triads

Triplets

Rows

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

The lA elements are called

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Alkaline earth metal

Alkaline metals

The halogens

The inert gases

Which of the following discoveries resulted in a version of the Mendeleefs

periodic law

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The nucleus of atom by Rutherford

The elements polonium and radium by the Curies

Atomic numbers by Moseley

x-rays by Roentgen

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

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