Question # 1

Which of the following orbitals has maximum penetration effect.

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s

p

d

f

The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is.

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5s1, 4d5

6s1, 5d5

6s1, 5d6

6s1, 5d4

The metallic character of group 14 elements

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Decreases from top to bottom

Increases from top to bottom

Does not change gradully

Has no significance

Pick out the incorrect statement

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The geometry around 'N' atom in trimethylamine is pyramidal

The geometry around N atom in trisilylamine is planar

The nitrogen atim is trimethylamine is sp2 hybridized whilst in trisilylamine it is sp2 hybridized

Trisilylamine has donor properties whilst trimethylamine has no donor properties.

The rusting of iron is catalyzed by which of the following.

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Fe

H+

O2

Zn

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

According to recent view which is the correct representation of hydrated proton in aqueous solutions.

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H+

H9O3+

H9O4+

H2O+

Dolmite is a mineral whose formula is.

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CaCO3

Mg CO3

CaCO3, MgCO3

CaSO4

How many varieties of commercial iron are known.

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1

2

4

3

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

Which process of adsorption of hydrogen on palladium is known as.

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Syneresis

Occlusion

Diffusion

Erosion

Which one of the following pairs are chemically dissimilar.

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Na and K

Ba and Sr

Zr and HF

Ca and Zn

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

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.

In graph of atomic volume versus atomic weight the elements corresponding to peaks in the curve belong to.

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Group 1

Group 18

Group 4

Group 14

Group IV A consist of elements.

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3

4

5

6

Group VII A of periodic table consist of elements.

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4

5

6

7

Titanium dioxide shows the lattice strcuture.

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Flluorite

Rutile

Wurtzite

Zeolite

Among the elements A,B,C and D having atomic numbers 9,10,11, and 12 respectively, the correct order of ionization energies is.

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A > B > C >D

B > A > D > C

B > A > C > D

D > C > B > A

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

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