Question # 1

Fluorine finds considerble use of DDFT which is used as.

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herbicide

Fungacide

Insecticide

Nomatocides

In which pair of species, the Lewis formula contain same number of Lone pairs and bond pairs but they are not iso electronci.

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O2 B2

SO2, O3

PCl3, BF3

SOCl2, COCl2

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

Dry ice is

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Solid CO

Solid CO2

Solid NH3

Solid SO2

Calcium cyanamide on treatment with steam under pressure gives NH3 and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

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

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Iron

Cu

Cr

Ni

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

Elements of group 14 have the electronic configuration of their outer shell as

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ns2 np3

ns2 np2

ns2 np6

ns2

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

Magnesium burns in air to give.

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MgO

MgCO3

Mg3N2

Both A and C

Which of the following is not a property of aluminium.

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An efficient electrical conductor

A low density compared to other metals

Is amphoteric

Toxic to humans

Boron and aluminum halides are electron deficient compounds in this respect. they act as.

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Lewis acid

Lewis base

Oxidizing agent

Reducing agent

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

Xenon diflouride is obtained by irradiating a mixture of xenon and fluorine with light from a high pressure.

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Mercury arc

Tungeston arc

Xenon arc

None of above

In the electrolysis of alumina, cryolite is added to.

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Lower the melting point of alumina

Increase the electric la conductivity

Minize anodize affect

Remove impurites from alumina

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