Question # 1

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

The pH of the 0.0032 M H2SO4 is.

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3.2

4.0

2.198

1.0

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

Which of the following electrode is normally used as reference electrode for a potentiometer.

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Platinum electrode

Calomel electrrode

Silver electrode

Copper electrode

Which of the following is NOT a hardware requirement for die casting.

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Water cooled metal cavities

Machined metal holding blocks

Ejection mechanism

Metal mold

The common oxidation state of elements of group V A is.

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-3

+3

+5

Any above

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

Radon is obtained only in the radioactive decay of

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Radium

Thorium

Actinium

Any of above

In nature nickel is found in the form of.

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Sulphides

Silicates

Arsenides

All

Of the following the commonly used n the laboratory desiccator is.

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Anhyd. Na2Co3

Anhyd Ca Cl2

Dry NaCl

None of the above

The splitting of H2O can be carried out through

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Photolysis

Electrolysis

Dialysis

Hydrogenation

Lithium shows diagonal relationship with

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Beryllium

Sodium

Magnesium

Calcium

Glucose and fructose react with which of the following reagent to give same product.

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Tollen's reagent

Phenyl hydrazine

Hydroxyl amine

All of these

The change of chemical potential of any component with temperature an constant P and composition, is euqal to.

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Partial molar enthalpy of that component

Partial molar volume

Partial molar free energy

Negative of the partial molar entropy

Which of the following effects best explains that o-nitro phenol is insoluble in water.

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Inductive effect

Resonance effect

Intramolecular H -bonding

Isomeric effect

In Ostwald's process of manufacturing nitric acid a mixture of ammonia gas with air is mantained with ratio.

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1 : 4

1 :3

1: 8

1 : 10

The unit of sound pressure level is

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Pascal

Decibel

Newton

Ampere

Red brass contain about how many percent of zinc.

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20 %

15 %

30 %

25 %

The bond formed by complete transfer of electrons from electropositive to more electronegative atom is called.

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Ionic bond

Covalent bond

Mettalic bond

Co ordinates bond

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

UV radiation from the sun causes a reaction in the atmosphere that leads to production

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Fluorides

Carbon monoxide

Sulphur dioxide

Ozone

Which substances is not used as an additive in paper industry.

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Glucose

Starch

Alum

None of these

Which of the group 13 element does not form M (III) idodie.

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Al

Ga

Ti

In

Which among the following is a false statement.

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SiO2 has a structure similar to that of CO2

Natural Si exists only in the combined state

Si can be prepared by reducing SiO2 with Mg

Si does not exist in graphite like structure, but exists only ni diamond like structure.

In propagation step the reaction intermediate of radical polymerization is

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Carbocation

Carbonion

Free radical

Carbene

The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called.

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Free energy

Threshold energy

Activation energy

External energy

Which of the following is not an alkali metal

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Rb

Sb

Cs

Fr

Which of the following statements are correct for Linear polymers.

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Linear polymers may be condensation as well as addition polymers

Structure is well packed in nature

Linear polymers have higher density higher melting point and higher tensile strength

All are correct

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

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

The first ionization energy in electron volts of nitrogen and oxygen atoms are respectively given by.

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14.6, 13.6

13.6, 14.6

13.6, 13.6

14.6, 14.6

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