Which pair of elements is chemically most similar?

  • Na, Al

  • Cu, S

  • Ti, Zr

  • Zr, Hf

In the transition elements, the incoming electron occupies (n-1)d sublevel in preference to:

  •  np

  •  ns

  • (n-1)d

  • (n+1)s

The electronegativity of elements from group 1 to group 17 :

  • Decreases

  • Increases

  • Remains constant

  • All of the above

The electronic configuration of the most electropositive element is :

  • [He]2s1

  • [Xe]6s1

  • [He]2s2

  • [Xe]6s2

Which one of the following is an amphoteric oxide?

  • SO2

  • B2O3

  • ZnO

  • Na2O

Elements of groups IB and IIB are called:

  • Normal elements.

  • Transition elements.

  • Alkaline earth metals.

  • Alkali metals.

Element that has the greatest tendency to lose an electron is :

 

  • F

  • Fr

  • S

  • Be

The outer electronic configuration of Gd (Atomic no. 64) is:

  • 4f3 5d56d2

  • 4f8 5d106d2

  • 4f4 5d46d2

  • 4f7 5d16s2

The radius of La3+ (at. no. 57) is 1.06 A° The radius of Lu3+ (at.no. 71) might be:

  • 1.06  A°

  • 0.85  A°

  • 1.60  A°

  • 1.40  A°

Which of the following transition metal ions has the lowest density?

  • Copper

  • Nickel

  • Scandium

  • Zinc

Ionic radii are :

  • Inversely proportional to the effective nuclear charge.

  • Inversely proportional to the square of effective nuclear charge.

  • Directly proportional to the effective nuclear charge.

  • Directly proportional to the square of effective nuclear charge.

Which one is a metalloid?

  • Tin

  • Germanium

  • Sulphur

  • Carbon

Zn and Cd do not show variable valency like 'd' block elements due to :

  • Softness

  • Completed 'd' orbital

  • Two electrons in outermost orbit

  • Low m.p.

In the long form of periodic table, the elements having lowest ionization potential are placed in:

  • I group

  • IV group

  • VII group

  • Zero group

Elements with an electronic configuration 1s2 2s22p6  3s23p63d10 4s24p64d10 5s25p3 belong to the group :

  • 3rd

  • 15th

  • 17th

  • 2nd

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

  • 3d3,4s2

  • 3d5,4s1

  • 3d5,4s2

  • 3d2,4s2

Those in a group that falls under the law of triads include:

  • Cl, Br, I

  • C, N, O

  • Na, K, Rb

  • H, O, N

In the long form of the periodic table, all the non-metals are placed under:

  •  s-Block

  •  p-Block

  •  f-Block

  •  d-Block

General electronic configuration of the transition elements is given by:

 

  • ns2nd1-10

  • ns2np6nd1-10

  • (n-1)d1-10np6

  • (n-1)d1-10ns1-2

The statement that is incorrect for the periodic classification of elements is:

filled with electrons monotonically with an increase in atomic number.

  • The properties of elements are a periodic function of their atomic number.

  • Non-metallic elements are lesser in number than metallic elements.

  • The first ionization energies of elements along a period do not vary in a regular manner with an increase in atomic number.

  • For transition elements, the d-subshells are

Which among the following options is a nonmetal?

  • Gold

  • Mercury

  • Scandium

  • Selenium

The ions O2-, F-, Na+, Mg2+, and Al3+ are isoelectronic. Their ionic radii show [2003]

  • an increase from O2- to F- and then decrease from Na+ to Al3+

  • a decrease from O2- to F- and then increase from Na+ to Al3+

  • a significant increase from O2- to Al3+

  • a significant decrease from O2- to Al3+

An example of metalloid elements in the periodic table is:

  • Na and K

  • Cu and Al

  •   As and Si

  • Ca and Mg

The element with atomic number 26 is:

 

  • A non-metal

  • Krypton

  • Iron

  • Manganese

The alkali metals have:

  • highest ionization energy

  • largest atomic radii

  • highest density

  • highest electronegativity

The telluric helix was given by:

  • Newland

  • Mendeleev

  • Lothar Meyer

  • De-chancourtois

The element with atomic number 30 is expected to be present in:

  • IB group

  • IA group

  • IIA group

  • IIB group 

The correct order of acid strength is:

  •  Cl2O7>SO2>P4O10

  •  CO2>N2O5>SO3

  •  Na2O>MgO>Al2O3

  •  K2O>CaO>MgO

Which among the following elements is the bridge element?

  • K

  • O

  • Mg

  • Pb

Four successive members of the first-row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

  • Vanadium (Z = 23)

  • Chromium (Z = 24)

  • Iron (Z = 26)

  • Manganese (Z = 25)

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