Question # 1

Pick out the incorrect statement for CIF3

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It has trigonal planar geometry

It is used to make gaseous UF6 which is useful in making enriched U-235 fuel

It is used as powerful fluorinating agent for inorganic compounds

CIF2 has been used as fuel in short range rockets reating with hydrazine.

Which of the following is the most stable towards heat.

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CaCO3

BaCO3

Na2CO3

MgCO3

The process of extracting a metal in pure form its ores is known as.

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Crushing

Grinding

Dressing

Metallurgy

Which of the following compounds is electrovalent in nature.

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SO2

ICI

KBr

CHI3

Sodium silicate is used

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In the paint industry

For fixing labels to glass

In a soap industry

All above

Which of the following is the most abundant alkaline earth metal.

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Be

Mg

Ca

Sr

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

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

Relative order of acidity of HF, HCl, HBr, and HI acids is

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HCl > HBr > HI > HF

HF > HCl > HBr > HI

HI > HBr > HCl >HF

HF > HI > HCl > HBr

Among sodium phosphate, sodium sulphate and sodium chloride the solubility in water increases as.

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Chloride > Phosphate > Sulphate

Sulphate > Pohosphate> Chloride

Chloride > Sulphate > Phosphate

Phosphate > Chloride > Sulphate

Anhydrous AlCl3 cannot be obtained by heating hydrated AlOI3 ,6h2o Because.

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It decomposes completely to give Al2O3

It does not lose water completely

It undergoes hydrolysis to give Al(OH)3

AlCl3 .6H2O is very stable.

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

The correct order of reactivity among I , Ii, and III IS.

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i > ii >iii

i > iii > ii

II > III > I

III > II > I

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

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

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ns2 np3

ns2 np2

ns2 np6

ns2

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

Which one of the following has a linear structure.

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H2O

CO2

NO2

SO2

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

Calcium cyanamide on treatment with steam under pressure gives NH3 and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

The bond order gives the following valuable information.

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Stability of the molecules of ions

Bond dissociation energy and bond length

Magnetic properties

All of the above

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