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Physics Chemistry Botany Zoology

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The law of triads applicable to a group of:

Cl, Br, I
C, N, O
Na, K, Rb
H, O, N

In the long form of 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:

ns²nd^1-10
ns²np⁶nd^1-10
(n-1)d^1-10np⁶
(n-1)d^1-10ns^0-2

The statements that is not correct for the periodic classification of elements is:

the properties of elements are the periodic functions of their atomic number
non-metallic elements are lesser in number that metallic elements
the first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number
for transition elements, the d-sub-shells are filled with electrons monotonically with the increase in atomic number.

Which of the following is not a metal?

Gold
mercury
Scandium
Selenium

The ions O^2-, F^-, Na⁺, Mg²⁺ and Al³⁺ are isoelectronic. Their ionic radii show [2003]

an increase from O^2- to F^- and then decrease from Na⁺ to Al³⁺
a decrease from O^2- to F^- and then increase from Na⁺ to Al³⁺
a significant increase from O^2- to Al³⁺
a significant decrease from O^2- to Al³⁺

The example of metalloid elements in the periodic table is:

Na and K
Cu and Al
B 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:

{Cl}_{2} O_{7} > {SO}_{2} > P_{4} O_{10}

{CO}_{2} > N_{2} O_{5} > {SO}_{3}

{Na}_{2} O > MgO > {Al}_{2} O_{3}

K_{2} O > CaO > MgO

Which is called a bridge element?

Li
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?

[2005]

Vanadium (Z = 23)
Chromium (Z = 24)
Iron (Z = 26)
Manganese (Z = 25)

Transition elements show:

variable valency
paramagnetism
catalytic properties
all of these