Question # 1

The solution having zero pH will be

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Basic

High basic

Highly acidic

Neutral

In an exothermic reversible reaction increase in temperature shift the equilibrium to:

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Remains unchanged

Product side

Reactant side

None of above

Which is amphoteric oxide among the following oxides?

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rubeduim oxide

sulphur trioxide

lead oxide

phosphorus pentaoxide

Mark the incorrect statement:

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metallic character increases down the group

metallic character increases along a period

metallic character decreases along period

metallic character remain the same down the group

In 1000 molecules of 0.001 M acetic acid the number of H⁺ions is 12.6, then its percentage of ionization is

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1.33%

1.26%

12.6

1%

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

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0.002

0.2

50.0

50/RT

If we increase pressure in decomposition of PCl₅will favour the raction in

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Forward direction

Backward direction

At equilibrium

No effect

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

Which of the following alkali metals does not exist naturally

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Francium

Rubidium

Lithium

Cesium

At equilibrium 0.6 moles of SO₂were found. There equilibrium constant of the reaction will be

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0.36

0.45

0.54

0.67

The optimum conditions of temperature and pressure to get maximum NH₃form N₂and H₂gases is

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200°C and 10 atmosphere

0°C and 1 atmosphere

400°C and 200-300 atmosphere

200°C and 100 atmosphere

A correct order of electron affinity among the following is

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F > CI > Br

Br > CI > F

CI > F > Br

F > Br > CI

Which one of the following aqueous solutions has the highest pH

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0.1 MnaOH

0.1 MHCl

0.2 MH₂SO₄

0.1 MHNO₃

Chemical equilibrium involving reactants and products in more than on phase is called

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static

dynamic

homogeneous

heterogeneous

Which statement is correct?

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all the metals are good conductors of electricity

all the metals are good conductors of heat

all the metals form positive ions

all the metals form acidic oxides

Choose the elements which can dorm amphoteric oxides:

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Te,B

Rb,TI

In,As

Si,Cd

Which of the following oxides is amphoteric in character?

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CaO

CO₂

SiO₂

SnO₂

According to the modern periodic law, the physical and chemical properties of elements are periodic function of their:

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atomic size

atomic volume

atomic weight

electronic configuration

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

Which of the element is the best conductor of electricity

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Zn

Fe

Cu

Ca

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