Question # 1

The ratio of moles of a particular component of solution to total moles of all components of solution is :

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Mole fraction.

Molality.

Molarity.

Normality.

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

which enzyme is not involved in the fermentation of starch ?

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Diastase

Zymase

Urease

Invertase

Non-formation of menisus by Hg in presence of O₃is due to the formation of

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Mercuric oxide

Mercurous oxide

Mercuric chloride

Mercurous chloride

If the difference of pKa values of the two acids is 2, then

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Acid with smaller pKa is 10 times stronger acid

Acid with greater pKa is 10 times stronger acid

Acid with smaller pKa is 100 times stronger acid

Acid with greater pKa is 100 times stronger acid

Ethyl alcohol prepared during fermentation is pure:

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20%

10%

11%

12%

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

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Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

Choose the correct answer of transition elements?

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Transition elements have low melting points

Transition elements do not have catalytic activity

Transition elements exhibit variable oxidation states

Transition elements exhibit inert pair effect

Which reaction yields Bakelite?

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Urea with HCHO

Tetramethyl glycol with Hezamethylene diisocyanate

Phenol and HCHO

Ethylene glycol and Dimethylterephthalate

pKb value of NH₄OH is 4.74. If the concentration of NH₄OH is 1 molar containing 0.1 molar NH₄Cl, then pH of this buffer will be

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3.74

10.26

4.74

9.26

How many cm³of 1 M H₂SO₄required to neutralize 10 cm³of 1 M NaOH

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2 cm³

2.5 cm³

5 cm³

10 cm³

A species having positive or negative charge is called:

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Electron

Ion

Proton

Atom

Homologues differ from each other by an integral number of

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CH₂groups

CH₃groups

CH groups

CH₄groups

Which of the following elements have the largest radius

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F

Cl

Br

l

Which property depends on the state of system

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Enthaply

Free energy

Entropy

All these

The valency, ionization energy and electrongativity of elements are related to its

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Atomic number

Properties

Atomic weight

Family group

The number of groups in the periodic table is

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6

7

8

9

What element is not essential the growth of plants and is not required in the fertilizers

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Nitrogen

Potassium

Phosphorus

Barium

Reaction takes place at anode is

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Ionization

Reduction

Oxidation

Hydrolysis

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

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500 nm

500 m

200 nm

5 x 10⁷m

The method involved for electrolysis of Na or K salts of carboxylic acids

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Sabatier's sendrens reaction

Kolbe's method

Clemmensen

Wolf kishner reduction

Which of the following will be good conductor of electricity

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Pure distilled water

Molten NaCl

Dilute solution of glucose

Chloroform

Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

Reactivity of alkyl halides with magnisium is of the order:

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Rl > RBr> RCl > RF

RBr > RCl >RF > Rl

RCL > RF > Rl > RBr

RF >RI >RBr > RII

The radius of first orbit of H-atom is

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4.75 A°

3.84 A°

8.4 A°

0.529 A°

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

The hydrocarbons having double bonds normally end with suffix

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Ane

Ene

Yne

Oic

Gooch crucible is made of:

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Brass

Porcelain

Bronze

.Gold

Balmer's series is in ______ region

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Visible

U V

I. R.

None

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

Among the elements given below, the one with highest electropositivity is

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Cu

Cs

Cr

Ba

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