Question # 1

Which one of the following statements regarding BF3 is not correct.

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It is an ionic compound

It is an electron deficient compound

It is a Lewis acid

It forms adducts

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

Which among the following elements has the highest value of IE.

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Mg

Na

Ca

Sr

Which compound among the following does not contain an ionic bond.

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NaOH

HCl

KaS

LiH

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4

Cryolite is used in the electrolytic extraction of aluminium to.

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Obtain more aluminium

Reduce alumina

Protective electrodes

Dissolve bauxite and increase the electrical conductivity

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

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

Ten elements Sc (Z = 21) to Zn (Z = 30) fill their 4s orbitals first and then 3d orbitals are called elements. of.

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3 d series.

4d Series

5d Series

None of above

Which of the following elements has the highest melting point.

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Magnesium

Calcium

Strontium

Berylliium

Used in TV sets and sound movies to give ready response to electrical potential

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He

Ne

Ar

Kr

In which property listed below hydrogen does not resemble alkali metals.

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Tendency to form cation

Nature of oxide

Combination with halogens

Reducing character.

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

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

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

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

"Acids are substance whose aqueous solutions turned blue litmus red and tasted sour" stated by

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Davy

Liebig

Boyle

Rouelle

BCl3 is an example of hybridization

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sp

sp2

sp3

None of above

The hybridization of sulphur in sulphur dioxide is.

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sp

sp2

sp3

dsp2

The formula of hexa borane is.

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B4H10

B6 H10

B5 H9

B8 H12

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