Question # 1

How many CI^- ions are there around Na+ ion in NaCI crystal?

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3

4

6

8

Which of the following is used as coagulant for purification potable water?

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Copper sulphate

Barium sulphate

Alum

Nickel sulphate

The graph between pressure and volume at constant temperature for gas is:

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Isobaric

Isothermal

Isotherm

None of above

The weight of 11.2 liters of CO₂ at S.T.P would be

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88 g

44 g

32 g

22 g

The gases H₂, O₂, H₂S and SO₂diffuse in the order

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SO₂>H₂S>H_2>O₂

H₂S>SO₂>O₂>H₂

O₂>SO₂>H₂>H₂S

H₂>O₂>H₂S>SO₂

Raffinose is a trisacharirde composed of monosaccharide is

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Glucose

Glactose

Fructose

All

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

Incineration is a process in which solid waste is burned at high temperature ranging from

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500 to 600°C

900 to 1000°C

1000 to 1100°C

600 to 700°C

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

An ideal gas expands according to PV=constant. On expansion, the temperature of gas

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will rise

will drop

cannot be determined because the exteral pressure is not known

will remain same

The avtive mass of 64 g of HI in a two litre flask would be

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2

1

5

0.25

Rusting can be avoided by :

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Making alloys

Tin or Zinc plating

Use of enamel

All of these

When potassium metal is exposed to violet light

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Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

The absorption of electrons takes place

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Diastase

Lipase

Inverters

Zymase

Zeotropic mixture

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Obey Henry's law

Obey Raoult's law

Does not obey Raoult's law

Obey Dalton's law

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

When two hydrogen atoms approach to form a chemical bond

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The repulsive forces dominate the attractive forces

The attractive forces, dominate the repulsive forces

The energy of atoms increases

The two atoms start ionization

The amount of energy required to remove an electron from an atom of an element in the gaseous state is called

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Electron affinity

Electronegatively

Ionization energy

None of these

Grignad reagent is reactive due to

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The presence of halogen atom

The presence of Mg atom

The polarity of C - Mg bond

None of above

Elimination bimolecular reactions usually obey

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First order kinetics

Second order kinetics

Third order kinetics

Zero order kinetics

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