Question # 1

In which compound, the oxidation state of boron in not +3

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H2BO3

Ca2B2O11

Na2B4O7

Mg3B2

The basis of modern periodic table is

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Electron affinity

Atomic mass

Ionization Potential

Atomic number

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

Litharge is chemically

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PbO

PbO2

Pb3O4

Pb(CH3COO)2

The oxidation of NO in air produces

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N₂O₃

NO₂

N₂O₃

N₂O₄

Which one of the following compounds is a heterocyclic.

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Anthracene

Phenol

Pyridine

Aniline

Group VI B to transition elements contains

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Zn, Cd, Hg

Fe, Ru, OS

Cr, MO, W

Mn, Te, Re

Which halogen occurs naturally in a positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

Which one of the following gases is prepared by heating a mixture of sodium acetate and sodium hydrozide.

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CH4

CH2-CH3

CO2

CO

The correct name of CH3-CH= CH2-OH is

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2-buten -4 -ol

3-buten-I-ol

2-Buten -I-ol

Ethylene glycol

Which one is used for manufacture of fertilizers

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Methane

Ethane

Ethene

Ethyne

For ----------------- Mechanism, the first step involved is the same

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E1 and E2

E2 and S_N2

S_N1 and S_N2

E1 and S_N1

Grignard reagent is reactive due to

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The presence of halogen atom

The presence of Mg atom

The polarity of C -Mg bond

None of the above

The nitrogen present in some fertilizers helps plants

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to fight against diseases

to produce fat

to undergo photosynthesis

to produce protien

The bond angle between any two SP²Hydridized orbitals is of

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180°

109.5°

120°

107.5°

Out of the elements of group VIA the highest melting and boiling points is shown by the element.

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Te

Se

S

Po

What is effect of solubility of carboxylic acid in water by increasing their molecular masses.

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Decreases

Increase

Remain constant

Non effected

The strength of binding energy of transition elements depends upon

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number of electron pairs

number of unpaired electron pairs

number of neutrons

number of protons

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