Question # 1

The photoelectric effect is the ejection pf electrons from the surface of metal when light falls on it. Which of the following statements is not correct about the phenomenon.

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The kinetic energy of photo electron depends upon the frequency of the incident radiation

Electrons are ejected only when the frequency of light exceeds a certain threshold value

The higher the energy of the photon greater the kinetic energy of the ejected electron.

The threshold frequency of all the metals is same.

Which is the correct order of wave number of the following redistions.

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X-rays > uv > Infrared > visible> radio waves

X-rays > uv > visible > Infrared > radio waves

X-rays > radio waves > uv > visible > Infrared

X-rays > Infrared > uv> visible > radio waves

Which of the following compounds cannot be a monomer.

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CH3-CHOOH -CH2OH

NH2 -CH2-NH2

CH3-CH2-NH3

NH2-CH2-CH-CH2 -NH2

CH3

A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains.

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NO2 ion

NO3 ion

Br ion

I- ion

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Length of semiconductor nanorods are in the range of.

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1.50 nm

1-50 micro meter

100-500 nm

50-100 nm

When a strong beam of light is passed through a colloidal solution, the light will

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Be reflected

Be scattered

Pass unchanged

Be dispersed

Point out the incorrect statement.

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Rate law is an experimental fact whereas law of mass action is a theoretical in nature.

Rate law is always different from the expression of law of mass action

Rate law is more informativeness than law of mass action

Order of the reaction is equal to the sum of the exponents of concentration terms in the case law.

At constant temperature , the decrease in Halmholts free energy is equal to.

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Decrease in entropy

Increase in entropy

Reversible work done by the system

All types of work done

The following ceramic product is mostly used as pigment in paints.

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TiO2

SiO2

uo2

ZrO2

Which of the following reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

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

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Ca2+

Cl-

Ar-

K+

A property which gradually increases on moving down group in the periodic table is

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Ionization enthalpy

Elemtronegativity

Electron affinity

atomic size

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

Final paper wound in the form of a real having final moisture of about.

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6-8%

9 - 12 %

13-15 %

4 - 10%

Layer of the C -atom in graphite are hold together by

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Covalent bonds

Free electrons

Ionic bond

Van Dar Waals forces

Which of the following property has a higher value for trans isomer as compared to cis isomer.

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Density

Dipole moment

Melting point

Boiling point

Arrange the following in order of increasing boiling point.

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CH3OH < CH3Cl < RbCl < CH4

CHOH < CH4 < CH3Cl < RbCl

RbCl < CH3Cl < CH3OH < CH4

CH4 < CH3Cl < CH3OH < RbCl

Which of the following water require zero hardness.

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Boiler feed water

Laundry water

Paper will water

Dyeing water

Which of the following is not a correct postulate of the kinetic theory of gases.

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The molecules are in random motion

The gaseous collisions are perfectly elastic

The average kinetic energies of different gases are equal at a particular temperature.

The pressure exerted on the walls of the container is due to inter molecular forces.

Not a Characteristic property of ceramic material

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High temperature stability

High mechanical strength

Low elongation

Low hardness

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

Which of of the following statement is not correct in respect of

Arrhenius concept.

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This concept is applicable only for aqueous systems.

Neutralization takes place in aqueous medium only

H+ ion concept remain as such in water

This concept is applicable for non aqueous system only.

The noble gases are found in the atmosphere to the extent of about some percent by volume.

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0.5%

1.0%

1.5%

2.0%

For a given mass of a gas if temperature increase

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Pressure and volume remain Constance

Volume increases provided pressure is kept constant

Pressure decreases provided volume is constant

Both volume and pressure decrease

Lux -Flood concept is a dono-acceptor system of.

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Proton

Electron pair

Neurtron

Oxide ion

Which of the following will exhibit variable electro Valency due to intert pair effect.

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Fe

Sn

K

Both Fe and Sn

Which one has a co ordinate bond.

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Al2Cl6

BF3

NaCl

O2

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

Which among the following is insoluble in water.

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LiOH

KOH

NaOH

RbOH

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

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