Question # 1

Number of elements present in 5th period is

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8

18

32

24

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Diastase

Lipase

Inverters

Zymase

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

Which halide among the following is used as methylating agent?

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CH₃l

C₂H₅Cl

C₂H₅Br

C₆H₅Cl

Carboxylic acid can generally be prepared by various methods. Which of the following methods is not suitable for making carboxylic acids

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By the oxidation of primary alcohols

By the hydrolysis of nitriles

By the carbonation of Grignard, reagent

By the hydrolysis of p-amines

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

The protein which only yield amino acids and their derivatives

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Simple proteins

Complex proteins

Derived protein

All of these

An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is

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56 cm³

550 cm³

5.6 cm³

11.2 cm³

Half life period of N₂O₅is 24 minutes and it remains same where we increase or decrease its initial concentration, then reactions

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Zero order

First order

Second order

Third order

A chemical reaction is in equilibrium when

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Formation of product is minimum

Reactants are completely transformed into products

Rates of forward and backward reactions are equal

Equal amounts of reactants and products are present

Which one of the following has discontinuous solubility curve

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CaCI₂6H₂O

NaCI

KCI

NaNO₃

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

Series starting from57La,42Hf -80Hg is in the period:

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4th

5th

6th

7th

The digestion of fats in the intestines is aided by

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Diffusion

Protection

Peptization

Emulsification

Ether show the phenomenon of :

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Position isomerism

Functional group isomerism

Metamerism

Cis-trans isomerism

The three N - Hσ-bonds are made by

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sp³- s overlap

sp²- s overlap

P - p overlap

sp - overlap

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

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Orbital overlap will not occur

Bonding will not occur

Both (A) and (B) are correct

None of the above are correct

Which functional group is present in glycerol tristearate

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Carboxylic acid

Alcohol

Aldehyde

Ester

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Moles per dm³

Partial pressures

Number of moles

Mole fractions

Which of the following statement about fluorine is not correct?

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Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Fluorine does not form oxoacid

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

How many monochlorobutanes will be possible on chlorination of n-butane?

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1

2

3

5

Heat absorbed by a system when its volume does not change is equal to

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Internal energy of system

Enthalpy of system

Increase in internal energy of system

Increase in enthalpy of system

Ionic hydrides are generally

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Liquid at room temperature

Good electrical conductors

Good reducing agents

Easily reduced

0.5 M of H₂SO₄is diluted from 1 litre to 10 litre, normality of resulting solution is

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1 N

0.1 N

10 N

11 N

Base buffer solution can be prepared by mixing

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Weak acid and its salt

Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Hydrolysis of alkyl nitriles gives:

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alkane

alkyl halide

alkyl nitride

carboxylic acids

Alcohol can be prepared from Grignard's reagent with an aldehyde: If we start with formaldehyde the product alcohol with be

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Primary

Secondary

Territory

Aromatic

What is the shape of Fe(CO)₅molecule?

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Tetrahedral

Octahedral

Trigonal bipyramidal

Square pyramidal

Hydrogen gas and iodine vapours combine to form Hl at 425°C, the same composition of mixture is present if we start with decomposition of Hl. It suggests

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A static equilibrium

Law of mass action

A dynamic equlibrium

Irreversible reaction

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