Question # 1

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

Which element of group V-A and VII-A does not use d-orbital?

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Nitrogen

Sulphur

Arsenic

Chlorine

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

Which of the following elements is most metallic

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Bi

sb

As

P

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

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