Question # 1

Which of the following statements is not correct about galvanic cell?

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Anode is negatively charged

Cathode is positively charged

Reduction occurs at anode

Reduction occurs at cathode

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Which of the following has isomorphous structure with MgO

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NaF

S

Sn

N

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

In order to maintain the boiling point of water at 110 C°, the extemal pressure should be

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550 torr

between 500 and 760 tor

between 760 and 1500 torr

any pressure can be maintained

Acetylide can give back ethyne upon treatment with

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water

strong base

dil. Acid

weak base

If the distance between Na⁺ and CI^- ions in sodium chloride crystal is X pm,the length of the edge of the unit cell is

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4X om

X/4 pm

X/2 pm

2X pm

Arginine, lysine and ornithine are

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Obtained by hydrolysis of proteins

Essential amino acids

Basic amino acids

Derived from butyric acid

Which one of the following pair of atoms is most likely to form an inoic bond?

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Na and F

C and F

N and F

O and F

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

When stress is applied to the metals, the metals are malleable and ductile because

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their layers slip pass each other

atoms lose electrons

mobility of electrons increased

none of the above

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Which of the following salt is used as purgative

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CaSO₄

MgSO₄

BeSO₄

NaCl

Select from the following which one is alcohol?

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CH₃-CH₂-OH

CH₃-O-CH₃

CH₃COOH

CH₂-CH₂-BR

Alkyl halides ae considered to be very reactive compounds towards nucleophiles because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bad leaving group

They have a nucleophilic carbon and a good leaving group

When a weak acid is dissolved in water or a weak base dissolved in water, then in both cases the conjugate acid base pair is produced. The ionization constants K_aand K_bof a pair are related with each other as

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K_a= K_b

K_a. K_b= K_w

K_a. K_w= K_b

K_b. K_w= K_a

DDT is formed from

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Benzene and Chlorobenzene

Chloral and Chlorobenzene

Chloral and Benzene

Chlorobenzene and chlorine

Hydrocarbons are organic compounds which contain elements such as

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Hydrogen

Carbon

Hydrogen and carbon

Halogens

The empirical formula of a liquid compound is known to be C₂H₄O. What other information is needed to work out its molecular formula?

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The percentage composition of the compound

The relative molecular mass of the compound

The density of the compound

The volume occupied by one mole of the compound

3 moles of ethanol react with one mole of phosphorus tribromide to from 3 moles of bromoethane and on mole of X. Which of the following is X?

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H₃PO₄

H₃PO₂

HPO₃

H₃PO₃

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

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Electric field

Magnetic field

Incident light

X-rays

SO₂Makes ______ acid rains

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Carbonic acid

Sulfuric

Nitric acid

All of these

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