Question # 1

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

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

Which of the following elements does not impart any characteristic colour to the flame.

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Ca

Mg

Ba

Sr

Sodium react more vigorously than lithium because.

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It is a metal

It has higher atomic mass

It is more electronegative

It is more electropositive

Since the acid gives both acidic and normal salts so the acid is.

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di acid

di basic

double salt

Any of above

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

Titanium dioxide shows the lattice strcuture.

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Flluorite

Rutile

Wurtzite

Zeolite

Hydrolith is the common name of

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NaH

CaH2

NaF

CaF2

Diamond and carbon are the _________ forms of carbon

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Isotropic

amorphous

Allotropic

Isomeric

Colour in transition metal compounds in attributed to

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Small sized metal ions

Absorption of light in UV region

Complete ns sub shell

incomplete (n-1) sub shell

Dolmite is a mineral whose formula is.

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CaCO3

Mg CO3

CaCO3, MgCO3

CaSO4

The element having highest ionization energy and least electron affinity belong to

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Period 1 , group 18

Period 2, group 17

Period 2, group 1

Period 2, group 2

B.P of heavy water is

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equal to that of ordinary water

greater than that of ordinary water

Less than that of ordinary water

equal to that of distilled water

d2 sp3 is oriented in a manner

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Trigonal

Tetrahedral

Octahedral

Trigonal bipyramidal

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

Which of the following have identical bond order.

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CN- and O2-

CN - and NO+

O2- and CN+

NO+ and CN+

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.

The atomic number of potassium is 19 and that of mangness is 25 Although the colour of MnO4 is dark violet yet the K+ is colourless this is due to the fact that.

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Mn is a transition element while K+ is not

[MnO4]- is negatively charged while K+ has positive charge

The effective atomic number of Mn is [MnO4]- is 26: while for K+ the atomic number is 18

The Mn is a high positive oxidation state allows charge transfer transitions.

Which of the following ions is smallest in size.

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F-

Cl-

I-

Br-

In urea the amount of nitrogen is

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82.0%

46.0%

33.0%

21.0%

Sodium silicate is ued

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In fire proofing of wood and textiles

As a preservative of eggs

As a furniture polish

All above

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