Question # 1

Alkanes containing carbon C₁₈ownwards are

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Gases

Liquids

Waxy solids

Solids

95% ethanol is called:

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Rectified other

Diesel

Rectified spirit

Petrol

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

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Paschen

Pfund

Balmer

Brackett

Which statement about Arrhenius equation is incorrect

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Factor 'A' called Arrhenius constant depends upon collision frequency of reactants

Rate of reaction increase by increasing temperature

Rate constant k is increased

Activation energy Ea is decreased by rise in temperature

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

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Hund's rule

Markowvikov's rule

Pauli's exclusion principle

Auf ban principle

Which element has 4 unpaired electrons in 3d-orbital

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Chromium - 24

Manganese - 25

Iron - 26

Cobalt - 27

Which of the following is a molecular diseases?

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Allergy

Cancer

German measles

Sickle cell anemia

The hydroxyl derivatives of aromatic hydrocarbons which have the -OH group directly bonded to the ring C-atom are called

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Alcohols

Ketones

Esters

Phenols

What is the packet of energy called?

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Electron

Photon

Positron

Proton

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Condensation

Dehydration

Dehydrogenation

Hydrogenation

Which of the following has more unpaired d-electrons?

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Zn⁺

Fe²⁺

Ni³⁺

Cu⁺

When acetylene is passed through a copper tube at 300°C, it polymerizes to

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Polyacetylene

polyethylene

Benzene

None of these

Alkyl halides on treatment with Zn and HCI gives

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Alkanes

Alkenes

Alkynes

Alcohols

If the standard electrode potential of CU²⁺/Cu electrode is 0.34 V, what is the electrode potential of 0.01 M concentration of Cu²⁺? (T=298)

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0.399 V

0.281 V

0.222 V

0.176 V

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

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0, 1, 2, 3

+3, +2, +1, -1, -2, -3

0, -1, -2 ,-3

-3, 0, +3

Fluorine molecule is formed by

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The axial p-p overlap

The sidewise p-p overlap

The axial s-p overlap

The overlap of two sp²hybrid orbitals

Orlon is a polymer of

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Tetrafluoroethylene

Acrylonitrile

Ethanoic acid

Benzene

The substances which soften the polymer are called

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Stabilizers

Plasticizers

Retarders

Pigments

The orbitals having n + l = 5 are

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2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

Reaction of Grignard's reagent with formaldehyde gives:

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pri-alcohol

sec-alcohol

ter-alcohol

carboxylic

How many g of dibasic acid (mol. wt. 200) should be present in 100 ml of the aqueous solution to give 0.1 Normality?

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1 g

2 g

10 g

20 g

Formalin is:

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

A filtration process could be very time consuming if it were not aided by a gentle suction which is developed:

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If the paper covers the funnel up to its circumstances

If the paper has got small sized pores in

If the stem of funnel is large so that it dips in to filtrate

If the paper fits tightly.

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

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C₂H₅OH

CH₃OH

CH₃COOH

C₂H₂

For which mechanisms, the first step involved is the same:

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E₁ and E₂

E₂and SN₂

E₂ and E₁

E1 and SN₁

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Which of the following statements is no correct regarding bonding molecular orbitals?

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Bonding molecular orbitals possess ls energy than atomic orbitals from which they are formed.

Bonding molecular orbitals have low electron density between the two nuclei.

Every electron in bonding molecular orbitals contributes to the attraction b.w atoms.

Bonding molecular orbitals are formed when the electron waves undergo constructive interference.

Which of the statement is contrary to the first law of thermodynamics

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Energy can neither be created nor destroyed

One form of energy can be transferred into an equivalent amount of other kinds of energy

In an adiabatic process the work done is independent of its path

Continuous production of mechanical work without supplying an equivalent amount of heat is possible

Activity of the enzyme is reduced by

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Temperature

Concentration

pH

Inhibitors

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