Question # 1

Bond will be covalent when electronegativity difference of bonded atom is

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Equal to 1.7

between 0.5 to l.7

Greater to 1.7

zero

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

Vapour pressure of a liquid is more if

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the intermolecular forces between the molecules of the liquid are strong

the intermolecular forces between the molecules of the liquid are weak

more liquid is present in a container

liquid has more surface area to evaporate

Which of the following best describes the shape and polarity of the carbon disulphide molecule?

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Bent and polar

Linear and non-polar

Pyramidal and polar

Bent and non-polar

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Which of the following has isomorphous structure with MgO

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NaF

S

Sn

N

Carboxylic acids reacts with sodium carbonate, & gas evolved in this reaction

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CO2

H2

CO

Both a &b

The reagent used to distinguish between ethanol and propanal is

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I2/ NaOH

Benedict's reagent

LiAIH

sodium nitroprusside

Which gas diffuses more rapidly?

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O₂

SO₃

NH₃

H₂

Example of basic essential amino acids

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Arginine

Histidine

Lysine

All of the above

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

The measurement of degree of disorder is

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Internal energy

Enthalpy

Entropy

None

DNA has deoxyribose, a base and the third component is

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Phosphoric acid

Ribose

Adenine

Thymine

The cathodic reaction in the electrolysis of dill H₂SO₄with Pt electrodes

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Reduction

Oxidation

Both oxidation and reduction

neither oxidation or reduction

The presence of a double bond in a compound in the sign of:

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Saturation

Unsaturation

Subsitution

None

The process in which one s and two p orbitals mix up with each other is called

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Sp-hybridization

Sp²-hybridization

Sp³-hybridization

Dsp²-hybridization

Which of the following compounds does not react with NaHSO₃?

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C₆H₅CHO

Acetophenone

Acetone

Acetaldehyde

Methanol and ethanol can be distinguished by

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Iodoform test

Iucas test

Dichromate/H₂SO₄oxidation test

Flame test

Acetone reacts with HCN to form a cyanohydrin. It is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

HNO₂acts as an/a

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Acid

Oxidizing agent

Reducing agent

All the three

K_avalue of HF acid is 6.7 x 10^-15the acid is a

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Weak acid

Moderately strong acid

Strong acid

Very weak acid

Which inorganic precipitate acts as semipermeable membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

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