Question # 1

All of the following are essential amino acids except

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Lysine

Aspartate

Tryptophan

Hisitidine

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

Which of following is NOT use the polyvinylacetate (PVA)

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An adhesive material

Binder for emulsion

Used as gramophone

None as these

Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil

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diffusion

convection

electrophoresis

chromatography

1-chloropropane and 2.chlorpropane are isomers of each other, the type of isomerism in these two is called

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Cis-trans isomerisn

Position isomerism

Chain isomerism

Functional group isomerism

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

The correct value of the gas constant R is close to

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0.082 litre-atm K^-1 mol^-1

0.082 litre-atm^-1 K mol

0.082 litre-atm K

0.082 litre-atm^-1 K mol^-1

Which element is expected to show the greatest tendency to form some covalent compounds?

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aluminium

calcium

magnesium

sodium

The attractive forces between molecules of a gas and their sizes can be ignored at

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high pressure

low temperature

low temperature and high pressure

low pressure and high temperature

The energy of ionization of an atom is the energy difference between orbital

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Ether shows the phenomenon of

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position isomerism

Chain isomerism

Metamerism

Cir-trans isomerism

Cotton has cellulose in it:

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96%

97%

98%

99%

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

Coordination number of Pt in [PtCI(NO₂) (NH₃)₄]²⁺is

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2-

4

1

6

Which of the following statements is not correct regarding bonding molecular orbitals?

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

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

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

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

Which of the following reagent will react with both aldehyde and ketones?

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Grinard's reagent

Tollen's reagent

Fehling's reagent

Benedict's reagent

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

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Low pressure

High pressure

High temperature

High concentration of SO₂

Alkaline earth metals are usually

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Reducing agent

Oxidizing agent

Amphoteric

Acidic

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