Question # 1

The aluminium alloy used to make parts of aircrafts is.

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Magnalium

Aluminium bronze

Duralumin

All of the these

Which one of the following oxides is basic.

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MnO

Mn2O3

MnO2

Mn2O7

The concept is also known as proton donor acceptor system.

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Bronsted Lowery

Lewis

Lux Flood

Usanovich

Which of the following alkaline earth metals occurs in radioactive form in nature.

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Ca

Mg

Ra

Ba

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of above

The oxidation number Xe in XeOF2 is

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0

+2

+4

+3

The shape of SO₄^2-ion is.

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Tetrahedral

Trigonal planar

Square planar

Octahedral

Which of the following statements is correct.

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A sigma bond is weaker than a pi pond

There are four coordinate bonds in the Lewis structure of NH4+ ion.

The 1 covalent bond is directional in nature

A single bond between the two atoms cannot be re bond.

The structure of SO2

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Linear

Angular

V-shaped

Planner

Allotropic form of tin

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White tin

Grey tin

Rhomic tin

All above

Group VA of the periodic table consist of elements.

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3

4

5

6

Which is the second most abundant element occurring the earth crust.

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Iron

Cu

Cr

Ni

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

The elements with highest electron affinity belongs to.

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Period 2 , group 17

Period 3, group 17

Period 2, group 18

Period, 2 , group 1

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

Molecules have zero dipole moment

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CO2

BCl3

CH4 & CCl4

All above

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal.

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N2O3

HNO3

SO2

SOCl2

In manufacturing of cement crystallization of amorphous dehydration products of clay

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500 ^oC to 800 ^oC

900 ^oC to 1200^oC

1250 ^oC ti 1400 ^oC

1000 to 1100 ^oC

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