Question # 1

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

A polymer may be

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Linear

Branched

Cross linked

All of these

How many isotopes are present in palladium

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Two

Four

Six

nine

The scale of temperature that shows the freezing point of water at 0° is called

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Fahrenheit

Kelvin

absolute

Celsius

Ar has low critical temperature and pressure due to its

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small size

monatomic molecule

low polarizability

liquefaction temperature close to room temperature

^{Reaction of ethyl bromide with ammonia}

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Completes in a single step

Completes in two steps

Continues till N is left with no lone pair

is reversible

Global warming is mainly caused by ______ radiations

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UV

I.R

gama

X-rays

The chemical reactivity of glass is reduced by the use of

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fluxes

formers

stabilizers

none of the above

Ethane when completely halogenated in excess of chiorine can form

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Hexachloroethane

Dichloroethane

Pentachloroethane

1.1.2.2-terachloroethane

Newspaper can be recycled again and again by how many times

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5

4

2

3

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

The sample being analyzed is called

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Electrolyte

Substance

Analyte

All of above

When acetamide reacts with Br₂and caustic soda, then we get

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Acetic acid

Bromoacetic acid

Methyl amine

Ethylamine

For which system does the equilibrium constant, KC has units of concentration

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CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF₂Cl.

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CHF Cl C FCl

CH Cl CF₂Cl

CHF CF₂Cl

C FCl CF₂Cl

The negatively charged particles are called

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Cation

Radical

Anion

Positron

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

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The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺

NH₄Cl dissociates less fully than NaCl

The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons)

The ion NH⁺₄acts as an acid

Which reaction yields Bakelite?

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Urea with HCHO

Tetramethyl glycol with Hezamethylene diisocyanate

Phenol and HCHO

Ethylene glycol and Dimethylterephthalate

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

In a compound an atom has negative oxidation state because

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Atom is negatively charged

Atom acts as cathode

Atom is more electronegative

Atom has lowest ionization energy

Which one of the following equations represent the reaction that occurs when calcium nitrate is heated strongly

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Keeping in view the size of atoms, which order is the correct one

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > l

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