Question # 1

The boiling point of radon (211 K) is higher than boiling point of Helium (4.4 K) because

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the atomic number of Rn is larger than that of the He

the atomic mass of Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent that between He atoms

Rn atoms are joined by dipole-dipole force whereas He atoms are joined by hydrogen bonding

Which one is nitrogen fertilizer among the following:

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calcium sulphate

urea

magnesium carbonate

potassium phosphate

The steroids of fungi and yeast are called:

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Vitamin D

Vitamin D₂

Ergosterol

Cholesterol

According to Boyles law, at constant temperature the product of pressure and volume of a given mass of gas is

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whole number

a constant

fraction

a multiple

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

Which of the following alcohol is more soluble in H2O

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Propanol

Butanol

Pentanol

Hexanol

Sugar crystals belong to the system

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cubic

monoclinic

triclinic

orthorhombic

Which alcohol is most reactive towards sodium metal?

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Ter Butyl alcohol

n-Propyl alcolol

Isopropyl alcohol

Have same reactivity

NH³ shows a maximum boiling point among the hydrides of V-A group elements due to :

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very small size of nitrogen

lone pair of electrons present on nitrogen

enhanced electronegative character of nitrogen

pyramidal structure of NH³

Hydrogen has a = 0.245 atm. dm³. mole^-2and b = 0.0266 dm³. mole^-1SO₂gas has a = 6.170 atm. dm³mole^-2and b = 0.0564 dm³mole where a and b are Van der Waal's constant

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H₂gas deviates more from ideal behaviour tha SO₂

SO₂gas deviates more form ideal behaviour than H₂

both deviate from ideal behaviour equality

both are ideal gases

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

Which statement is incorrect for balancing of redox reactions by ion-electron method

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The reaction is splitted into two half reactions

H₂O and H⁺ions are added for acidic or neutral reaction to balance O and H atoms

To balance H, HCi, is added

To balance O and H in the alkaline reaction OH^-added

Identify the compound formed, when ethylene combines with water in the presence of 10% sulphuric acid and HgSO₄as catalyst

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Carbinol

Methanol

Ethanol

Glycol

The decrease in radius in large for:

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Monovalent ions.

Trivalent ions.

Divalent ions.

Atoms.

Absolute alcohol is obtained by adding rectified apirit in alcohol:

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Water

Na₂CO₃

NaOH

CaO

Buffers having pH less than 7 are made

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Mixture of weak acid + salt of it with strong base

Mixture of weak acid + salt of it with weak base

Mixture of weak base + salt of it with strong acid

Mixture of weak base + salt of it with weak base

In the ground state of an atom, the electron is present:

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In the nucleus.

In the second shell.

Nearest to the nucleus.

farthest from the nucleus.

Carboxylic acids functional group is:

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----COOH

-----COH

----CO---

----OH

Carboxylic acids on complete reduction in the presence of HI and red Phosphours gives:

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esters

alcohols

alkanes

aldehydes

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

The heat of formation of graphite and P(white) is ______ KJ/mole

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0.00

-273.0

+8.7

813.99

H-bonding is not present in

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Glycerine

Water

Hydrogen sulphide

Hydrogen fluride

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