Question # 1

Which one of the following statements about diamond is not true?

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the coordination number of carbon atoms is 4

diamond is an isotpe of graphite

diamond has a high melting point

diamond has a rigid tetrahedral, structure

Elements having high ionization potential values are

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metals

non- metal

liquids

solid

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

Chloroethene, CH₂ = CHC/ is the monomer of PVC.
What are the C-C-C bond angles along the polymeric chain in PVC?

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They are all 109.5°

half are 109.5° and half are 120°

They are all 120°

They are all 180°

What does no happen when an ideal gas is heated?

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an increase in the average energy of the gas particles

an expansion in the range of kinetic energies possessed by particles

an increase in the number of molecules with lower energies

a drop in the number of molecules with lower energies

How many isotopes are present in palladium

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Two

Four

Six

nine

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

NaNO₃and CaCO₃crystals are Rhombohedral isomrophism is due to

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both soluble in water

their cations belong to S block element

same shape of NO₃^-1and CO₃^-2ions which is triangular planar

same number of O atoms

Which of the following folymer is used as binder

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PVC

PVA

Acrylic resins

Polyester

In which of the following compounds H-binding is not present?

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ethanol

ether

water

ammonia

Deposition of cholesterol in arteries is responsible for:

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Heart attach

diabetes

hepatitis

cancer

Acetic anhydride is obtained form acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

Metal used in the preparation of Grignard's reagent is:

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Ca

Na

Mg

Zn

The decrease in radius in large for:

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Monovalent ions.

Trivalent ions.

Divalent ions.

Atoms.

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

Direct conversion of solid into vapors is called :

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Crystallization

Sublimation

Obligation

Vaporization.

Aniline reacts with which of these to form Schiff base?

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Acetic acid

Bezaldehyde

Acetone

NH₃

which enzyme is not involved in the fermentation of starch ?

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Diastase

Zymase

Urease

Invertase

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

The nitrogen present in some fertilizers helps plants to:

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Fight against diseases

Produce fat

Undergo photosynthesis

Produce protein

Hybridized in carbon is:

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sp

sp²

sp³

d²sp

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm, atomic weight

One gm, Equivalent

Eletrochemical equivalent

None of the above

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