Question # 1

If a = b = c and x = y = z 90° then crystal structure is

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Cubic

Tetragonal

Orthorhombic

Triclinic

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

Natural fertilizers are materials derived form:

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plants

animals only

both plant and animals

none of all

Change in enthalpy (∆H) of a system can be calculated by

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∆H=∆E - PV

ΔH =ΔE +q

∆H = ∆E - q

∆Η = ΔΕ + P∆V

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

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Henry's law

Hess's law

joule's law

Law of conservation of energy

The concentration of product is increasing from 30 mole/dm3 to 40mol/dm3 in 0.5 sec then rate of reaction will be------moledm-3sec-1

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0

20

15

25

Coenzymes are the species which increase the activity of enzymes. They are chemically

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Metal ions

non-metals

Organic acids

Organic bases

Casenogen is

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Chromoprotein

Phosphoprotein

Glycoprotein

Lipoprotein

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

UV rays inactivate enzymes because they

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change sequence of amino acids of enzymes

They add prosthetic group to them

They increase their specificity

affect structure of enzymes

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

The % of CO₂is the atmosphere is

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3.0%

0.03%

0.3%

0.5%

Which of the following nitrogen fertilizer contains more nitrogen

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NaNO₃

KNO₃

NH₄NO₃

Urea

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

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2

1

5

0.25

Benzene is obtained from benzene sulphonic acid by treating with

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HCl

NaOH

H₂O

NaHCO₃

Benzene has a -------- structure

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Pentagonal

Hexagonal

Heptagonal

Tetragonal

Among the lanthandes the one obtained by synthetic method is

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Lu

Pm

Pr

Gd

Substances that tend to decrease the activity of enzymes are called

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Coenzyme

Activators

Inhibitors

Apoenzyme

CsF is an ionic compound because:

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High I.P of Cs and high E.A of F.

High I.P of Cs and low E.A of F.

Low I.P of Cs and high E.A of F.

Low I.P of Cs and low E.A of F.

Given data

(i) heat of formation of CO₂is -393.7 KJ mole^-1

(ii) heat of formation of H₂O is -285.8 KH mole^-1

(iii) heat of combustion of CH_{4 is -890.00 KJ mole}^-1

Enthalpy of formation of methane from C and H₂is calculated by Hess's law by

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Adding i + ii + iii

Adding 2(i) and ii and subtracting iii

adding i + iii and subtracting ii

Adding i + 2(ii) and subtracting iii

What is not a common use of methane

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As a fuel

For the preparation of haloaklanes

For the preparation of methyl alcohol

For the preparation of sulphuric acid

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

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