Question # 1

Formamide is formed by the reaction of which acid with ammonia

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Oualic acid

Formic acid

Ethanoic acid

Propanoic acid

The water is considered to be polluted when the concentration of oxygen in it is

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6 - 9ppm

6 ppm

8 ppm

Less than 4pm

Keeping in view different factors which affect the melting point of a substance.the compound having melting point among the following is:

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LiCl

NaCl

CsCl

RbCl

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

D-block elements are also called

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Non-typical transition element

Outer transition elements

Abnormal transition elements

Inner transition

Amorphous solids:

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have sharp melting point

undergo clean cleavage when cut with knife

have prefect arrangement of atoms

can possesses small regions of orderly arrangement

The yellow color present in the photo chemical smog is due to presence of the

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Carbon dioxide

Nitrogen dioxide

Chlorine

All

The forces present between the ions and water molecules are called:

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dipole-dipole forces

dipole-induced dipole forces

London dispersion forces

ion-dipole forces

Dipole-dipole forces and London forces are collectively called

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hydrogen bonding

Vander Waals forces

Covalent bonding

Ionic bonding

The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is

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10

1

4

2

Boiling point of water remains 100°C although heat is continuous supplied. it is because

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decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

Vitamin A is present in

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Liver

Milk

Green vegetables

All

In a heterollytic bond fission reaction

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A molecule of H₂O is formed

A molecule of H₂O is eliminated

A free radical is formed

A positive and a negative ion is formed

75% plant nutrients are present in the fertilizer:

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Urea

NH₄NO₃

NH₃

(NH₄)₂HPO₄

Glyptal polymer is obtained from glycerol on reacting with

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Malonic acid

Phthalic acid

Maleic acid

Acetic acid

German silver does not contain

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Cu

Zn

Ni

Mn

Which of the following is hypnotic?

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Acetaldehyde

Metaldehyde

Paraldehyde

None

Glycogen is stored in

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Animals

Plants

Soil

None of these

The stroids of fungi and yeast and yeast are called:

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Vitamin D

Vitamin D₂

Ergostrol

Cholestrol

What is wrong about transition metals?

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Diamagnetic

Paramagnetic

Form complexes

Shows variable oxidation state

Acetic Acid reacts with PCl₅ giving:

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Acetamid

Acetyl chloride

Alcohol

ether

When 3p orbital is complete, the entering electron goes into

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4s

3d

4p

4f

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