Name the following element: A trivalent metal used to make light tools.

Trivalent metals are placed in group thirteen. These metals have three electrons that can be given off to attain stability. Aluminium is the trivalent metals that has low density and is used to make light tools. Duralumin an alloy of aluminium and copper is lightweight and strong enough to make the body of the aircraft.

Name the following element: An alkaline earth metal present in group 2 and period 3 .

An alkaline earth metal that is present in group two has valency 2 , and as it is present in period third it has three shells in its atom. Its electronic configuration is 2 , 8 , 2 , hence its atomic number is 12 . The metal is magnesium.

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In $H_{3} {PO}_{2}$ and $H_{3} {PO}_{3}$ , the numbers of $P - H$ bonds are, respectively,

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Important Questions on Periodic Properties and Variations of Properties – Physical and Chemical

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

Which element among the following does form

Pπ - Pπ

multiple bonds?

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In the case of nitrogen,

{NCl}_{3}

is possible, but not

{NCl}_{5}

while in the case of phosphorous,

{PCl}_{3}

as well as

{PCl}_{5}

are possible. It is due to

EASY

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Which of the following fluoro-compounds is most likely to behave as a Lewis base?

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The correct order of the bond angles of the given compounds is

HARD

Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

Name the following element:

A trivalent metal used to make light tools.

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In which oxidation state, group 15 elements act as Lewis base?

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In which substance does nitrogen exhibit the lowest oxidation state?

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

Of the following compounds, the most acidic is:

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

Name the following element:

An alkaline earth metal present in group $2$ and period $3$ .

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Give a reason for the following:

Inert gases do not form ions.

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Which of the following statements are correct?

I)

P_{4}

molecule is very reactive because of angular strain.

II)

The basicity of

H_{3} {PO}_{3}

3

III)

In gas phase, all

P - Cl bonds

{PCl}_{5}

have same bond length.

IV)

In solid state,

{PCl}_{5}

exists as an ionic solid, in which anion

{[{PCl}_{6}]}^{-}

has octahedral and cation

{[{PCl}_{4}]}^{+}

has tetrahedral shape.

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Which statements about Boron and its compounds, among the following are true?
(i) Boron has high density and good electrical conductivity.
(ii)

{}^{10}B

isotope metal borides are useful as protective shields in nuclear industry.
(iii) Borax and boric acid are used in the manufacture of glasses.
(iv) Orthoboric acid is toxic and hence not useful in antiseptic solutions.

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

The best reducing agent among the following is

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Which of following elements does not react with hot concentrated sulphuric acid?

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

A group

15

element, which is a metal and forms a hydride with strongest reducing power among group

15

hydrides. The element is :

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

Anomalous behavior of nitrogen is due to

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Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

Acid having

+ 4

oxidation state of phosphorus is

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Phosphorus pentoxide

(P_{2} O_{5})

is the starting material for phosphate esters used as surfactants and extraction agents.

P_{2} O_{5}

is extensively used as

HARD

Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>The Modern Periodic Table

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.

Element	Atomic number
$P$	$13$
$Q$	$7$
$R$	$10$

Which element has an electron affinity zero?

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Consider the following radioactive decays

I. ${}_{92}U {\overset{- α}{⟶}}_{90} Th$ and

II. $_{90} Th \overset{- α}{⟶} {}_{88}{Ra}$

In which case group of parent and daughter elements remains unchanged.

In H3PO2 and H3PO3, the numbers of P-H bonds are, respectively,

Important Questions on Periodic Properties and Variations of Properties – Physical and Chemical

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In $H_{3} {PO}_{2}$ and $H_{3} {PO}_{3}$ , the numbers of $P - H$ bonds are, respectively,