Question # 1

Which of the following factors will favour the reverse reaction in a chemical equilibrium?

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Increase in concentration of one of the reactants

Increase in concentration of one of the products

Removal of one of the products regularly

None of these

Nylon, 6,6 is a condensation polymer of

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Adipic acid and glycol

Phthalic acid and glycol

Adipic acid and hexaethylene diamine

Pthalic acid and hexaethylene diamine

Hydrolysis of Grignard's reagent gives:

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Alkane

Alkyl

Halide

Alcohol

Isotopes of an element differ in

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Number of protons

Number of electrons

Number of neutrons

Number of electrons and protons

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due

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Combining with oxygen to form carbon dioxide

Destruction of hemoglobin

Preventing reaction between oxygen and hemoglobin

Forming stable compound with hemoglobin

Which gasoline is better?

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Of low boiling point

Of low molecular mass

Of high octane

All of these

Vinegar is dilute solution of:

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Acitic acid

Formic acid

Butyric acid

Propionic acid

The percentage by weight of NaCl, if 6.0 g of NaCl is dissolved in 120 g of water is

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10.5 %

5%

8.02%

11.5%

Enzymes catalyse all biological reactions occurring in the cell. What is true about an enzyme

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Enzyme is a small molecule

Enzyme is acidic in nature

Enzyme is a protein

Enzyme is a lipid

Acyl halide is formed by reacting PCl₅with

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Alcohol

Ester

Amide

Both carboxylic acids as well as esters

Which of the following is fully fluorinated polymer?

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Neoprene

Teflon

Thiokol

PVC

______ are called biocatalysts

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Organic acids

Organic bases

Enzymes

All

Rates of organic reactions are

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Fast

Very fast

Slow

Non-reactive

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will bot cause water pollution

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Live stock waste

Agricultural pesticides

Oil breaks and spills

All of the above

Carboxylic acids are more acidic than pehnol and alcohol because of

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Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

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

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4s

3d

4p

4f

Which more acidic?

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o-cresol

p-nitrophenol

phenol

m-cresol

An electrochemical cell is based upon

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Acid-base reaction

Redox reaction

Nuclear reaction

None of the above

The colour of transition metal complexes is due to

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d-d transitions of electrons

Para magnetic nature of transition elements

Ionization

Loss of s-electrons

Hemoglobin is 68000 times heavier than:

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Oxygen atom

Nitrogen atom

Carbon atom

Hydrogen atom

The volume occupied by 1.4 g of N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

Which one of the following step is not involved in determination of empirical formula

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Determination % of each element

Determination of gram atom of each element

Determination of isotopes of each element

Determination of atomic ratio of element

The conversion of chemical energy into electrical energy requires :

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Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

During electrolysis, electrons are :

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Lost by anions and gained by cations

Gained by anions and lost by cations

Gained only

Lost only

The oxidation number of free element is always taken to be

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0

1

2

-1

Matals usually conduct electricity because

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There are mobile electrons in the metallic structure

Metals are decomposed by current

Metals have high resistance

In metals the ions are free to move

Smallest charge of electricity that has been measured so far is

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Charge on a-rays

Charge on electron (1.602 x 10^-19C)

Charge on x-rays

Charge on gamma rays

Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis

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96500 C of electricity liberates from CuSO₄solution

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63.5 g of Cu

31.75 g of Cu

96500 g of Cu

100 g of Cu

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