Question # 1

In vinyl cyanide, the number of a bonds in

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2

3

1

4

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

Photochemical among is generally formed

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In early hours of winters

Around mid day in summer months

When intensity of solar radiation sis very low

When concentration of particulate matter is very low.

Which of the following orbitals has maximum penetration effect.

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s

p

d

f

The angle between corresponding planes forming the external surfaces of the crystal remains constant for a given substances This is known as.

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Steno's law

Henry's law

Bragg law

Pascal law

Helium is used in weather balloons and airships instead of H2 becuse it is.

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Lighter than hydrogen

Incombustible

More abundant than hydrogen

Radiactive

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 electrical resistance of stainless steels can be as much as______ time that of carbon steel.

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5

6

10-

15

Which of the following level is an indicator of hearing loss.

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> 25 dB

< 25 dB

<20 dB

None of these

Which of the following molecules have centre of symmetry.

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H2O

HCl

CO2

H2SO4

Which of the following is not true as compared with alkaline earth metals.

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Alkali metals are more reactive

Alkali metals have lower density

Alkali metals are more electro positiveness

Alkali metals have stronger metallic bonds

The alkali metal with highest melting point is

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K

Na

Li

Ca

BCl3 is an example of hybridization

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sp

sp2

sp3

None of above

Oxides ores of Aluminium

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Corundum

Bauxite

Diaspore

All above

The branch of chemistry dealing with the study of reactions in the Uv visible region of the spectrum in known as.

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Kinetics

Photo chemistry

Surface chemistry

Catalysis

Which of the following cells is used to produce electricity from chemical reaction

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Electroytic cell

Galvanic cell

Voltaic cell

Fuel cell

Both C and D

Potassium reacts with excess of oxygen to form

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K2O

K2O2

KO2

K2O3

The formula of bleaching powder is.

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Ca OCl2

CaCIO3

Ca(CIO)3)2

CaOCI

Metallic magnesium is obtained by

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Reduction of MgO with Coke

Electrolysis of an aqueous solution of MgCl2

Electrolysis of molten MgCl2

Displacement of magnesium by iron form MgCl2 solution.

Pauling has suggested that the calculate of energy can be improved by considering.

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Screening effect

Polarization effect

Both A and B

None of abvoe

For quality control of Portland cement, the test essentially done is.

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Setting time

Soundness

Tensile strength

All

An ionic compound X + Y - is most likely to be formed if

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Ionization enthalpy of X is high electron gain ethalpy of Y is low

Ionization enthalpy of X is high electron gain enthalpy of Y is high

Ionization enthalpy of X is low,electron gain enthalpy of Y is low

Ionization enthalpy of X is low electron gain enthalpy of Y is high

The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.

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4000 A^o

5000 A^o

6000 A^o

10000 A^o

Oxidative enzymes are responsible for

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Biological processes

Biological oxidation

Biological hydrolysis

Biological isomerisation

Electronegativity of oxygen is.

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2,5

3,5

2,4

2.1

Which of the following statements regarding covalent bond is false.

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The electrons are shared between atoms.

The bond in non -directional

The strength of the bond depend upon the extent of overlapping

The bond formed may be polar or non-polar

Which of the following statement is not correct regarding galvanic cells.

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Oxidation occurs at the anode

Ions carry current inside the cell

Electrons flow around the external circuit. form cathode to anode

When the e.m.f. of the cell is positive cell reactionis spontaneous

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

Which of the following unit cells has least symmetry.

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Monocline

Cubic

Triclinic

Tetragona

Which of the following a -amino acid is not capable of exhibiting optical isomerism.

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Glycine

Leucine

Arginine

Alanine

Which of the following phenomenon are driven by solar energy.

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Winds

Water cycle

Production of biomass

All above

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