Question # 1

In the Mendeleev's periodic table elements are arranged in the increasing order of their .

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Numbers of neutrone.

Atomic number

Atomic mass

Atomic volume

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

With which one of the following configurations, the lowest value of first IE is associated.

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Is2, 2s2, 2p6, 3s1

1s2, 2s2, 2p5

1s2, 2s2, 2p6

1s2, 2s2, 2p6, 3s2, 3p2

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

Which of the following represent the fuming sulphuric acid

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H2S2O4

H2S2O3

H2S2O6

H2S2O7

Un-like s -block elements d-block elements form which compounds as well

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ionic compounds

Co valent compound

Co ordinate compounds

None of above

Metallic bond is treated essentially as in character

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Ionic

Covalent

Polar

Non polar

The noble gas used or treatment of cancer is

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Helium

Argon

Radon

Krypton

The unequal sharing of bonded pair of electrons between the two atoms in a molecule causes.

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Dipole

Radical formation

Decomposition of found

Covalent found

After assimilation urea leaves behind in the soil

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NH3

CO2

Both A and B

None of above

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

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Ca

Mg

Ra

Ba

Which of the following is not true of ozone.

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It is a strong electilizing agent

It attacks organic compounds containing carbon carbon double bond

Its molecular is linear and has two different O-O bond lengths

It is more powerful oxidising agent at molecular oxygen

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.

Xenan hexaflouride at 47.7 ^oC is

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Colorless solid

yellow solid

Yellow liquid

Colorless liquid

Which of the following statement is incorrect.

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An alloy is a mixture of two or more metals

An alloy is a mixture of two or more metal and non metal elements that have metallic properties

An alloy has a fixed composition

An amalgam is an alloy containing Hg

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

The principal ores of copper are

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Copper sulphides

Copper oxides

Both sulphides and oxides

Copper carbonate

Which of the following statement is not true regarding Open Hearth process.

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No iron is lost

The process is economical and simple

Steel obtained is of high quality

Scrap iron cannot be used in this process.

Molecules have zero dipole moment

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CO2

BCl3

CH4 & CCl4

All above

When metal orbital are rotated in octahedral field the following representation obtained.

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t2 g + lg

a1 g

t 1 u

All above

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

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