Question # 1

The total number of rare earth elements is

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8

32

14

10

Which is not an essential amino acid

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Leucine

Methionine

Histidine

Lysine

Which step is unnecessary for purification of water for drinking purposes

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Aeration

Coagulation

Treatment with chlorine

Treatment with iodine

The radius of first orbit of hydrogen atom

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0.329 A°

0.429 A°

0.529 A°

0.229 A°

The vapour pressure of two liquids 'p' and 'Q' are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

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140 torr

20 torr

68 torr

72 torr

According to the periodic law, the chemical properties of the elements are periodic functions of their

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Density

Atomic number

Atomic mass

Mass number

Which one does not declourized KMnO₄

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Alkenes

Alkynes

Bezene

All above

Which of the following has highest oxidation potential

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Be

Li

Na

Ca

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

Micro-nutrients are required in quantity ranging from

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4g-40g

6g-200g

6Kg-200Kg

4Kg-40Kg

Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as

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Wurtz reaction

Frankland's reaction

Cannizaro reaction

Kalobe's reaction

Which of the following oxides is unlikely to dissolve in aqueous hydroxide

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Al₂O₃

MgO

SO₂

SIO₂

In which of the following cases, the reaction goes farthest to completion

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K = 10³

K = 10^-2

K = 10

K = 10⁰

Eutrophication causes reduction in

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Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All the above

Thre rate of S_N2 reaction depends upon the

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Concentration of alkyl halides

Concentration of nucleophile

Concentration of alkyl halides and nucleophile

None of the above

The rate of E₁reaction depends upon

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The concentration of substrate

The concentration of nucleophile

THe concentration of substrate as well as nucleophile

None of the above

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

NaBH₄and LialH₄are

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Ionic hydrides

Covalent hydrides

Interposal hydrides

Complex hydrides

The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called

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Electron affinity

Ionization energy

Both of these

None of these

Which one of the following is a colligative property?

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Surface tension

Osmotic pressure

Viscosity

Refractive index

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

Which reaction produces a free radical

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SN reaction

Homelytic fission reaction

Heterolytic fission reaction

Addition reaction

When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

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Zero

First

Second

Third

The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

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Order of reaction can determined by an experiment

Order of reaction can determined from a balance equation only.

Order of reaction can determined increases by increasing temperate.

Order of reaction must be in whole number and not in fraction.

The method used only for the production of symmetrical alkanes

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Kolb's method

Clemmenen

Cannizzaro

Wolf kishner

At 25°C, the highest osmotic pressure is exhibited by 0.1 M solution of

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CaCl₂

KCl

Glucose

Urea

The change in concentration of reactant or product per unit time is called :

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Rate constant.

Rate of reaction.

Rate equation.

Rate law.

Two solutions of NaCl and KCl are prepared separately by dissolving 0.1 M of the solute in water. Which of the following statements is not true for these solution

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KCl solution will have higher boiling point than NaCl solution

Both the solutions have same boiling

KCl and NaCl solution possess same vapour pressure

KCl solution possess same freezing point at NaCl solution

Who rejected the vital force theory

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Wholer

Fisher

Newton

Lewis

Reaction of Grignard's reagent with formaldehyde gives:

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pri-alcohol

sec-alcohol

ter-alcohol

carboxylic

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Step 1 Step 2

HCI HCN

HcN,NaCH H₂SO₄

H₂SO₄ K₂Cr₂O₇/H₂SO₄

KCN HCI

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