Question # 1

Which element forms an iron with charge 3+?

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Berylium

Aluminium

Carbon

Silicon

The condition for standard enthalpy change is

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1 atm 30°C

1 atm 50°C

1 atm 25°C

760 atm 25°C

Ultraviolet radiation from sun causes a reaction that produces

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Fluorides

Carbon monoxide

Sulphur dioxide

Ozone

An organic acdi having molecular formula C₂H₄O₂is

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Formic acid

Acetic acid

Oxalic acid

Propionic acid

In a group, the ionization energy

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Increase

Decreases

Remain constant

First increases then decreases

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

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1

4

9

12

The hydroxyl derivatives of aromatic hydrocarbons which have the -OH group directly bonded to the ring C-atom are called

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Alcohols

Ketones

Esters

Phenols

strength of an acid can be determined by

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P^ka

P^kp

P^oH

P^kw

Purine derivative among the following bases is

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Thymine

Uracil

Guanine

Cytosine

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

Which of the following statement about electron affinity of two elements is correct

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Carbon has greater than oxygen

Sulphur has less than oxygen

Iodine has greater than bromine

Bromine has less than chlorine

The freezing mixture used in ice cream machine consists of ice and

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NaCI

KCI

MgCI₂

NaNO₃

Light emitted from a source has its wave length 500nm, then its wave number will be

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2 x 10⁶m^-1

2 x 10⁷m^-1

5 x 10⁸m^-1

5 x 10⁹m^-1

Increasing skin cancer and high mutation rate are due to

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Acid rain

Ozone depletion

CO pollution

CO₂Pollution

CH₃CH₂COOH is also named as:

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Propionic acid

Propanoic acid

Acetic Acid

Both (a) and (b)

Derivative of water is:

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Alcohals

Phenols

Either

Phenol

Which of the following will not give iodoform test?

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Ethanol

Ethanal

Isopropyl alcohol

Benzyl alcohol

The state of equilibrium refers to

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State of rest

Dynamic state

Stationary state

State of inertness

For principle quantum number n=4, the total number of orbitals having l = 3 is

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3

7

5

9

Cyclohexane can be converted not benzene in the presence of

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Pt at 100°C

Pt at 250°C

Pd at room temperature

Pt at room temperature

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

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Formation of an ester

Protonation of alcohol molecule

Formation of carbocation

Elimination of water

Acetic acid is miscible in:

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Water

Alcohol

Either

All of these

Gradation in properties in the periods of periodic tables are due to change in

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Atomic weight

The number of electrons

Number of protons

Electronic configuration

Vegetables oils are:

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Essential oils obtained form plants

None of these

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

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8 g

16 g

32 g

24 g

Which are used as essences(flowers)?

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aldehydes

Ketones

alcohols

esters

Which is the formula of tetra-ammine chloro-nitro platinum (IV) sulphate

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[Pt(NH₃)₄(NO₂)] SO₄

[Pt NO₂CI(NH₃)₄] SO₄

[Pt CI(NO₂) (NH₃)₄] SO₄

[Pt (NH₃)₄(NO₂) CI] SO₄

According to Mendeleev, the properties of the elements are periodic function of their

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Atomic number

Atomic volumes

Atomic masses

Atomic densities

Sodium phenoxide reacts with CO₂at 400 K and 4.7 atm pressure to give

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Sodium salicylate

Salicyl aldehyde

Catechol

Benzoic acid

Primary and secondary alcohols on action of red hot copper give

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Aldehydes and ketones respectilvely

ketones and aldehydes respectively

Only aldehydes

Only ketones

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