Question # 1

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

The amount of heat required to convert one mole of solid into liquid is called

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molar heat of fusion

heat of fusion

heat of vaporization

heat of liquefaction

All the following have crystals except:

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potassium bromide

diamond

cadmium sulphide

sodium chloride

Ethanoic acid reacts with PCI5, to give ethanoyl chloride. HCI and a third compound What is the third compound

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H3PO3,

POCI3

SO2

COCl2

When the temperature is raised, the viscosity of the liquid decreases.This is because of

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Decreased volume of the solution

Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them

Decreased covalent and hydrogen bond forces

Increased attraction between the moelcules

Cement is mixture of so many compounds roasted in rotary kiln.Which substance has greater percentage:

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Lime

Alumina

Silica

Magnesia

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

Condensation occurs between amino acids with the elimination of

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H₂O

H₂

O₂

NH₃

Which of the following activates phosphatase enzyme

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Ca²⁺

K⁺¹

Mg²⁺

Zn²⁺

CH₃CH₂COOH is also named as:

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Propionic acid

Propanoic acid

Acetic acid

Both (a) & (b)

On electrophoresis for plasma proteins using buffer of pH 8.6

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The proteins are neutral

The proteins carry negative charge

The proteins carry positive charge

The proteins are easily precipitated

Solubility cure of Na₂SO₄10H₂shows

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Constant increase of solubility

Constant decreases of solubility

Discontinuously solubility wit temperature

None of above

Which of the following statements about acetic, anhydride is not correct

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It is immiscible with water but is hydrolysed to give acetic acid

It is prepared by the action of actyl chloride on the sodium salt of acetic acid

it reacts with ammonia to give acetamide

it is a strong acid

Functional group of ketones is:

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---CHO

---CO---

---C≡ N

---COOH

The function of salt bridge is :

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To increase movement onions.

To increase the emf of cell.

To decrease the temperate

To maintain electrical neutrality

The net heat change in chemical reaction is same whether it is brought in two or more different ways in one or several steps. it is known as

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Henry's law

Joule's principle

Hess's law

Law of conservation of energy

Chief air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

If the difference of pKa values of the two acids is 2, then

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Acid with smaller pKa is 10 times stronger acid

Acid with greater pKa is 10 times stronger acid

Acid with smaller pKa is 100 times stronger acid

Acid with greater pKa is 100 times stronger acid

Which is independent of temperature

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Molarity

Molality

Normality

Mole fraction

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

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Greater.

same.

Smaller.

Not fixed.

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

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The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding constant

Butanenitrile is formed by reaction of KCN with

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Propyl alcohol

Butyl chloride

Butyl alcohol

Propyl Chloride

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