Question # 1

Aluminum is an active metal but does not corrode as iron does because.

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Ai does not react with O2

A protective layer of Al2 O3 forms on the metal surface

AI is harder to Oxidize than is Fe

Aluminium has a high tensile strength

iodine is used as a

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Photography

Manufacture of dyes

Analgesic

All above

Manganese steel usually contains how many percent of manganese.

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1 to 5

3 to 10

11 to 14

14 to 18

Sea water is converted into fresh water bases upon the phenomenon of.

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Plasmolysis

Sedimentation

Diffusion

Osmosis

Reverse osmosis

Which of the following statements is not related to the decomposition phenomenon occurring in nature.

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Decomposition is due to autotrophic organisms

Decomposition involves bacteria and fungi

During decomposition organisms carry out specific reactions

Many species of decomposer are present in the biosphere

Cobalt salt imparts which colour to the borax bead

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Blue

Green

Red

Yellow

H2SO4 acts as gent

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Reducing

Oxidizing

Both A and B

None of above

Which of the following is the most abundant alkaline earth metal.

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Be

Mg

Ca

Sr

Glycerol on dehyeration gives

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Allyl alcohol

Aerolein

CHOH = C= CHOH

-CHO -CHOH -CH2OH

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

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Group 1

Group 2

Group 17

Group 18

Neon is used in neon signs for advertising purpose because.

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Neon lights are visible from long distance

Neon light are visible though fog & mist

Both A and B

None of the above

Considering the element B,C, N, G and Si, the correct order of their non- metallic character is.

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B > C > Si > N > F

Si > C > B > N > F

F > N > C > B > Si

F > N c > > SI > B

Which of the following statement is not correct with reference to cell constant.

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The dimensions of cell constant is cm-1

It is used to determine the specific conductance

It is measured with KCl solution

Specific conductance does not vary with concentration.

What exactly is quantum dot

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A semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes or excitation in all three spatial directions

The sharpest possible tip of an atomic force microscope

A fictional term used in science fiction for the endpoints of wormholes

Unexplained spots that appear electron microscopy images of nanostructures smaller than 1 nanometer

The oxidation Number of I in HIO4 is.

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+6

+ 7

+ 3

+ 14

Which of the following compounds has highest dipole moment.

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Dichloromethane

Chloroform

Chloromathane

All above

Boron does not form B3+ ion because.

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It has small size and high ionization energy

It has high electromagnetically

It has high charge density

None of the above

Which substance is used as filler or additive in paper making.

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Starch

Glucose

Cellulose

Maltose

Valence bond theory is also called as

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Electron pair theory

Band theory

Electron gas theory

Electron pool theory

Which of the following technique is based on deposition of the analyte at appropriate electrode by the passage of the electric current.

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Chromatography

Dialysis

Electrodeposition

Solvent extraction

Which of the following is not related to the limitations of Bohr's model.

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It does not applicable to more than one electron system.

It does not explain the extra lines obtained in the H-spectrum

It considers the electron as particle

It considers the electron as a wave.

The number of degrees of freedom and number of components for a system of containing undissolved salt , in equilibrium with water vapor are.

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2,2

3 , 2

1 , 1

1 , 2

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

During the preparation of soap the liquid separated by distillation is

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Sodium hydroxide

Oil

Fats

Glycerol

Iodination of benzene takes place in the presence of iodine and

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HNO3

HIO3

HgO

All of these

Which of the following statement is correct.

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The wavelength of phosphorescence is less than the wavelength absorbed

Teh transition from T₁ to S₀ without the emission of light is called phosphorescence

The combination CO2 and water in plants, in the presence of chlorophyll, is an example of bioluminescence.

Population inversion is a necessary condition for laser action

The ionization energy of N is more than that of oxygen becasue.

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Nitrogen has half filled p orbitals

Nitrogen atom is smaller in size than oxygen atom

Nitrogen contains less number of electrons

Nitrogen is less electronegative

The _________ sphere is enclosed in brackets in formulas for complex species, and it includes the central metal ion plus the coordinated group

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Ligand

Donor

Coordination

Oxiation

C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

Which one of the following statements is not true.

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Transition metals form alloys

Transition metals form complexes

Zn, Cd and Hg are transition metals

K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn

Fluorine finds considerble use of DDFT which is used as.

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herbicide

Fungacide

Insecticide

Nomatocides

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