Question # 1

Among O, C, F, CI, Br, the correct order of increasing radii is

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F O C CI Br

F C O CI Br

F CI Br O C

C O F CI Br

The group number of element in periodic table indicates

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Valency with respect to hydrogen

The number of electron in the outermost shell

The atomicity

Number of shell

A chemical reaction A→ B is said to be in equilibrium when:

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Rate of transformation of A to B is equal to B to A

50% reactant has been changed to B

Conversion of A to B is 50% compete

Complete conversion of A to B has taken place

Which of the following oxides is amphoteric in character?

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CaO

CO₂

SiO₂

SnO₂

Among the following elements which one has the highest value of first ionization potential?

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Oxygen

Argon

Barium

Cesium

Sixth period of periodic table contains number of elements:

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10

18

32

8

Which is correct statement

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1^st electron affinity value is always negative

Term electronegativity is associated with molecule

Electron affinity is associated with atom

All of above

The dissociation of a weak acid H₂S in water can be suppressed by adding

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KCl

HCl

NH₄Cl

Any of these

In a chemical reaction equilibrium is said to have been established when:

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Rate of opposing reactions are equal

Rate constants of opposing reactions are equal

Opposing reactions stop

Concentration of reactants and product are equal

Germanium is a:

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metal

non-mental

transition

metalloid

element whose outer electronic configuration vary from ns² np to na¹ np⁶constitute:

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s-block elements

p-block elements

d-block elements

f-block elements

Kc < [ products]/[Reactants] favors

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Low of mass action

Rate expression

Forward reaction

Backward reaction

Select the covalent hydride among the followings :

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LiH

GeH₄

SrH₂

CsH₄

If the temperature in the synthesis of ammonia is decreased. The ammonia formation

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Increases

Decreases

No effect

Little change

The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

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Electron affinity

Electronegativity

Ionisation energy

Valency

Strength of an acid can be determined by

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K_a

K_b

pOH

pK_w

Na⁺,Mg²,AI³⁺ and Si⁴⁺ are isoelectronic ion Their sizes follow the order

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Na⁺<Mg²⁺<AI³⁺<Si⁴⁺

Na⁺<Mg²⁺>AI³⁺>Si⁴⁺

Na⁺<Mg²⁺<AI³⁺>Si⁴⁺

Na⁺>Mg²⁺>AI³⁺>Si⁴⁺

Choose the incorrect statement among the following:

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reducing power of elements increases from left to right in a period

electronegativities of elements increase along a period

oxidizing power of elements increase along a period

basic nature of oxides increases from left to right in a period

When HCl is added to H₂S aqueous solution its ionization:

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Increases

Decreases

Remains constant

First decrease than increse

Which element is the most electro positive in periodic table

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Barium

Calcium

Potassium

Cesium

Which of the following is different from other three oxides

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MgO

SnO

ZnO

PbO

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