Question # 1

An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element

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Sodium

Aluminium

Silicon

Phosphorus

Which of the following pair of atomic numbers represents s-block elements?

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7, 15

6, 12

9, 17

3, 20

Na₂O is

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Acidic

Basic

Neutral

Amphoteric

NaBH₄and LialH₄are

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Ionic hydrides

Covalent hydrides

Interposal hydrides

Complex hydrides

In sixth period 14 of its transition elements are called

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Lanthanides

Actinides

Radioactive elements

None

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

Of the given alkali metals, the one with smallest size is

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Rb

Cs

K

Na

Indicate the correct statement

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All lanthanidees are present in the same group

All halogens are present in the same period

All the alkali metals are present in the same group

All the noble gases are present int he same period

The hydration energy is the heat evolved when one mole of gaseous ion is dissolved in water. The hydration energy of an ion

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Increases with increase of charge to mass ratio

Decreases with increase of charge to mass ratio

Depends on sign of charge +ve or -ve

Depends upon the solvent

Ionization energy depends upon

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Nuclear charge

Atomic size

Shielding effect

All of the above

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

How does the ionization energy of 1st group elements vary?

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Increases down the group

Decreases down the group

Remains unchanged

Variation is not regular

Number of elements present in 5th period is

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8

18

32

24

Which of the following statement about electron affinity of two elements is correct

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Carbon has greater than oxygen

Sulphur has less than oxygen

Iodine has greater than bromine

Bromine has less than chlorine

According to Mendleev, the physical and the chemical properties are the periodic function of their

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Atomic number

Atomic mass

Atomic wt

None

The number of elements in the 4th periods of periodic table is

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8

10

18

32

Which of the following has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

Gradual addition of electronic shells in the nobel gases causes a decrease in their

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Ionization energy

Atomic radius

Boiling point

Density

Transition elements have valence electrons in

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s-orbital

p-orbital

d-orbital

f-orbital

Which of the following metal requires radiation of highest frequency to cause emission of electrons?

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Na

Mg

K

Ca

Gradation in properties in the periods of periodic tables are due to change in

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Atomic weight

The number of electrons

Number of protons

Electronic configuration

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

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 fourth period contains elements

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8

16

18

32

The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called

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Electron affinity

Ionization energy

Both of these

None of these

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

Which among the following elements have lowest value of IE₁?

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Pb

Sn

Si

C

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

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Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

What is the nature of Al₂O₃

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Acidic

Basic

Amphoteric

Neutral

The positive ion is always smaller than the neutral atom while the negative ion is always bigger than the neutral atom. The atomic and ionic radii of Na, F, Na⁺, F^-are in ppm

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Na F Na⁺ F^-

157 72 95 136

Na F Na⁺ F^-

157 95 172 136

Na F Na⁺ F^-

72 95 136 157

Na F Na⁺ F^-

157 136 95 72

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

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