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Physics Chemistry Botany Zoology

Question bank:

The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :

X = 2, 8, 3
Y = 2, 8, 8
Z = 2, 8, 8, 1
j = 2, 8, 8, 7

Which statement is true?

the electronegative nature of elements increases along the period
the electropositive nature of elements increases along the period
the chemical reactivity of elements increases along the period
the I.E of element decreases along the period

The most non-metallic element among the following is:

Be
B
Mg
Al

₅₈Ce is a member of:

s-block elements
p-block elements
d-block elements
f-block elements

The screening effect of 'd' electrons is :

much less than s-electrons
much more than s-electrons
equal to s-electrons
equal to p-electrons

Transuranic elements are those which are:

of higher atomic number than uranium
lighter than uranium
of lower atomic number than uranium
of same atomic number as uranium

correct increasing order of density is:

Li<K<Na<Rb<Cs
)Li<Na<K<Rb<Cs
Cs<Rb<K<Na<Li
K<Li<Na<Rb<Cs

General electronic configuration of outermost and penultimate shell of an atom is
(n - 1)s² (n - 1) p⁶ (n - 1)d^x ns². If n = 4 and x = 5, the number of proton in the nucleus is:

> 25
< 24
25
30

The maximum number of valency electrons possible for atoms in the second period of the periodic table is:

18
10
8
2

If a certain element has an atomic number 19, the element is:

an inert gas
a metal with oxidation number +1
a non-metal with oxidation number -3
a metal with oxidation number -3

Which of the following has the least density?

Na
Li
Mg
K

Eka aluminium and eka silicon are now known as:

Ga and Ge
Al and Si
Fe and S
H⁺ and Si

An element having the electronic configuration of its atom ns² np² should have similar properties to those of:

sodium
carbon
magnesium
oxygen

The order of basic character of given oxides is:

Na₂O > MgO > Al₂O₃ > CuO
MgO > Al₂O₃ > CuO > Na₂O
Al₂O₃ > MgO > CuO > Na₂O
CuO > Na₂O > MgO > Al₂O₃

the lightest metal in the periodic table is:

H
Mg
Ca
Li