Question # 1

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

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Rb

Cs

K

Na

Mendeleeve's periodic law is based upon:

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valency

atomic weight

equivalent weight

atomic number

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

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1.78

2.78

3.78

4.78

The element with atomic number 57 belongs to:

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s-block

transition elements

lanthanides

actinides

In order to classify the elements, Newland gave the idea of:

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atomic mass

atomic volume

triads

octaves

Buffer solutions are mostly prepared by mixing:

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Three substances

Four substances

Two substances

Five substances

Conjugate base of a very weak acid is:

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Relatively strong base

Relatively weak bass

Relatively very strong base

^{Relativelyvery weak base}

Which of the following pH is considered as acidic?

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9

11

8

1

Acetic acid is 1.33% ionized in 1000 molecules of 0.1 M acetic acid the number of H⁺ions is

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1.33

13.3

1.33

1

Catalyst use in Haber process

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V₂O₅

V₂O₅and pt

Fe

Pieces of Fe in fused mixture of MgO, Al₂O₃and SiO₂

Mendeleev s periodic table has number of groups and number of periods

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6,7

8,7

8,12

7,8

When rate of forward reaction is equal to rate of backward reaction the established equilibrium

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Chemical equilibrium

Static equilibrium

Dynamic equilibrium

All of these

The solution having zero pH will be

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Basic

High basic

Highly acidic

Neutral

Chose a set among the following set of atoms which is arrange in decreasing order of electronegativities

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S > Si > P

N > O > F

F > O > N

Si > P > S

Californium is the member of:

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alkali metals

alkaline earth metals

actinide series

lanthanide seires

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Total pressure

Catalyst

Concentration of H₂and l₂

Temperature

According to modern periodic law variations in the properties of element are related to their

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Atomic weights

Atomic numbers

Nuclear weights

Neutron-protin ratios

The valence shell electronic structure of an element is ns² np⁵. The element will belong to the group of

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Alkali metals

Inert metals

Noble gases

Halogens

A solution of NaOH has pH = 13, then concentration of NaOH is

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10^-13 M

10¹³M

10^-1M

10⁺¹M

In the periodic table which of following trend is correct across the periods

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Electronic affinity decrease

Electropositive character increases

Electronegative character decreases

Non-metallic nature increase

The most abundant metal present in the human body is

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Ca

Fe

K

Na

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