Question # 1

Which is the optimum temperature for the activity of enzyme

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20 - 35°C

10 - 15°C

55 - 70°C

35 - 55°C

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

Super conductors are derived from compounds of

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P-block elements

Lanthanides

Actinides

Transition elements

For better or worst we are living in society:

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wood

food

diseased

plastic

Select the name of reedy plant from which word paper is derived:

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Sunflower

Water hyacinth

Papyrus

Rose

Water cover earth surface more than:

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50%

60%

70%

80%

Energy required to remove electron from an atom

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Ionization potential

Electronegativity

Electropositivity

Electron affinity

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

Among the following molecules, which one has coordinate covalent (dative) bond?

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CCI4

CO2

CO

CH4

Volume of O₂gas at 0°C is 273 cm³, then volume of O₂gas at -10°C is

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263 cm³

163 cm³

173 cm³

73 cm³

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

The change in heat energy at constant temperature is called

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Enthalpy change

Heat of vaporisation

Bond energy

Internal energy change

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it

All valence electrons of iron are consumed

Rusting can be avoided by :

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Making alloys

Tin or Zinc plating

Use of enamel

All of these

Which of the following is non-typical transition element?

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Cr

Mn

Zn

Fe

General formula of carbocyclic acids is:

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RCOH

RCOR

RCOOR

R-OH

Decreases om concentration of reactant is denoted by

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dc/dt

-dc/dt

+dc/dt

None

Which one of the following reaction rate is effected by the light

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The state of hybridization of carbon atom in methane is

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sp³

sp²

sp

dsp²

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

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H₂SO₄

Ni

Fe₂O₃

Al₂O₃

Which salt is used for the treatment of hyperacidity in stomach

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NaCl

KCl

NaHCO₃

Na₂CO₃

Compounds X, Y and Z, all react with PCI₅to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z

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