Question # 1

Helium contents in the atmosphere by volume.

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0.0005%

0.0015%

0.0001%

0.00001%

Aque regia is made by dissolving a mixture of HNO3 and HCl with ratio.

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1 : 1

1 : 3

1 : 2

1 :10

Which of the following configuration is associated with biggest jump between second and third IE.

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1s2, 2s2, 2p2

1s2, 2s2, 2p6, 3s1

1s2,2s2,2p6, 3s2

1s2, 2s2,2p6

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

In extraction of iron, the furnace charge consists of iron ore, coke and limestone. The function of limestone is to act as.

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An oxidation agent

A reducing agent

Flux

Slag

Which element are non metals.

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N & P

Sb & Bi

As & Sb

N & Bi

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

The bond length is measured by

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X-ray diffraction

Neutron diffraction

Microwave spectroscopy

All of above

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

Which of the following iso -electronic ion would require least energy for the removal of electron.

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Ca2+

Cl-

Ar-

K+

Which ionization Potential in the following equations involves the greatest amount of energy.

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Na = Na+ + e

K = K+ +e

C2+ = C3+ +e

Ca+ = Ca2+ + e

Xenon reacts best with

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The most electropositive elements

The most electronegative elements

The hydrogen halides

Non metals

CIF is

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Chlorine monoflouride

Fluourine

Monochlorine fluoride

Monofluorine chloride

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

In a period, the element with biggest electron affinity belong to.

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Group 1

Group 2

Group 17

Group 18

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

Carbon tetra chloried has no net dipole moment because of.

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Its planar strcture.

Its regular tetrahedral structures.

Similar sizes of carbon and chlorine atoms

Similar electron affinities of carbon and chlorine.

When orthoboric acid is heated strongly it gives.

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B2O3

H2B3O7

HBO2

B

The pair of molecules or ions having identical geometry is.

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BCl3, PCl3

BF3, NH3

CHCl3, CCl4

SiCl4, CCl4

An element with atomic number 20 is placed in which period of the periodic table.

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1

2

3

4

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

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