Question # 1

All the member of group III A are metals except.

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B

Ai

Ga

In

The key element to be considered when evaluating a health hazard is.

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The amount of material the employee is exposed.

The total time of exposure

The toxicity of the substance

All above

Hydrolith is the common name of

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NaH

CaH2

NaF

CaF2

The maximum number of electrons in s,p,d and f sub shells are.

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2 in each

2, 6, 10, 18

2,6 ,10,14

5 in each

The dye obtained from madder root

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Indogotin

Indanthrene

Alizarin

Acriflavin

Natural fertilizers are materials derived from

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Plants

Animal

Algae

All of above

The ions Sc3+ , Ca2+ and K+ have same electronic configuration as that of.

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Neon

Argon

Krypton

Xenon

Ground water is threatened with pollution from which of the following source.

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Domestic wastes

Industrial wastes

Agricultural wastes

All above

The chrome vanadium steels contain how many percent of vanadium.

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0.15 to 0.30

0.05 to 0.15

0.30 to 0.45

0.45 to 0.60

Which is the following is not a buffer.

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H2CO3/HCO3

NH4Cl/NH4OH

CH3COOH/CH3COONa

NH3OH/CH3COOH

Which among the following is a Talse statement.

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SO3 is obtained by the catalytic oxidation of SO2

SO3 has trigonal planar geometry in gaseous state

SO3 in nauseous state has all S-O bonds equivalent

SO3 gas shows more solubility in water than in H2SO4

The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called.

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Halides

Hydrates

Clathrates

All of above

Magnalium is alloy of Aluminium which is used in

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Scientific apparatus

Aircraft parts

Rail road care

Boat machinery

Which of the following statement is not true is case of catalytic reforming.

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Dehydrogenations high endothermic

Dehydrogenation is exothermic

Hydrodealkylation reactions are endothermic

None of these

Which of the following techniques is involved in purification of organic compound.

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Distillation

Sublimation

Solvent extraction

All above

The pH of the 0.0032 M H2SO4 is.

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3.2

4.0

2.198

1.0

Citral when heated with KHSO4 forms.

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Isoprene

p-cymene

p-menthane

Dipentene

Cytosine a pyrimidine base pairs with

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Guanine

Thymine

Adenine

Any of these

Dolmite is a mineral whose formula is.

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CaCO3

Mg CO3

CaCO3, MgCO3

CaSO4

Which of the following alkaline earth metals occurs in radioactive form in nature.

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Ca

Mg

Ra

Ba

CO belong to which group.

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C_2v

D_2h

C_av

D_ah

The unit of sodium chloride structure is.

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Linear

Cubic

Tetrahedral

Square planner

Which of the following combination is used to make buffer.

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NaOH and HCl

KOH and H2SO4

CH3COOH and CH3COONa

CH3COOH and NH4OH

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

Conductometry is based on

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Electric current

Electrical potential

Absorbance

Electrical conductance

Which of the following is not an intensive property.

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Melting point

Refractive index

Entropy

Density

Which of the following ions is smallest in size.

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F-

Cl-

I-

Br-

The Langmuir adsorption iso therrn shows that the amount of adsorbed gas per gram of the solid is equal to.

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ap/1+bp

ap+1/1-bp

1+ap/1-bp

a(1+bp)

Which of the following solids is a better conductor of electricity.

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Pore NaCl cyrstal

Diamond

Graphite

Marble pieces

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

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