Question # 1

Which one of the following has the lowest pH values

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0.1 M HCI

0.01 M HCl

0.1 M KOH

0.01 M KOH

SO2 and NO2 cause pollution due to increase in:

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buffer action

basicity

acidity

neutrality

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

5604 cm3 of H2 gas at STP contains atoms of hydrogen

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6.02×10 (23)

2.6x10(22)

3.01x10(23)

1. 50x 10(23)

Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by

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dipole forces

non-polar interactions

ionic bonds

Hydrogen bonds

Which of the compounds cannot show positional isomerism?

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Alkanes

Alkenes

Alkynes

Alcohols

A complete food contains at least:

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three nutrients

ten nutrients

six nutrients

eight nutrients

The measurement of enthalpy change at standard conditions means that we should manage the measurement at

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24°C at 1 atm

25°C at 1 atm

0C° at 1 atm

100C° 1 atm

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimer

Macromer

Absolute zero, the lowest temperature on kelvin scale lies at

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-273°C

273°

-100°C

100°C

All of the following are non covalent except

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Hydrophobic interactions

Disulphide bond

Hydrogen bond

Electrostatic bond

Which are used as essences(flowers)?

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aldehydes

Ketones

alcohols

esters

[Ti(H₂O)₆]⁺³ion absorbs colour:

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Blue

Yellow

Green

Red

1.1 mol of A is mixed with 2.2 mol of B and the mixture is kept in on litre flask till the equilibrium is reached. At equilibrium, 0.2 mol of C is formed. If the equilibrium reaction is A+2B 2C+D, the value of equilibrium constant is

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0.002

0.004

0.001

0.003

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

Which electronic configuration corresponds to an element of Group ||Z-A of the periodic table?

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1s, 2s², 2p⁶, 3s², 3p⁶, 4s²

1s², 2s², 2p⁶

1s², 2s², 2p⁶, 3s², 3p³

1s², 2s² , 2p⁶, 3s², 3p¹

Boiling point of acetic acid is ^oC

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116

117

118

119

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

Elevation of boiling point is measured by

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Beckmann's apparatus

Lands Berger's method

Antifreeze apparatus

None of these above

[Cu[NH₃)₄]⁺²will form ______ structure

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Square planar

Tetrahedral

Octahedral

Trigonal bipyramidal

An alkane is produced when an alkyle halide reacts with zinc in the presence of

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HCl

CH₃COOH

Both a & b

None

The hydroxyl derivatives of aromatic hydrocarbons which have the -OH group directly bonded to the ring C-atom are called

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Alcohols

Ketones

Esters

Phenols

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