Question # 1

The branch of chemistry which deals with thermal energy changes in chemical reactions is called

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Chemical kinetic

Thermodynamics

Thermochemistry

Mechanics

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Le-chatlier's principle

Only adding catalyst

Decreasing pressure

Decreasing temperature

Alkyl halides are considered to be very reactive compounds towards nucleophiles because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bad leaving group

They have a nucleophilic carbon and a good leaving group

The number of neutrons in the element ⁹₄Be is

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4

5

9

13

A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

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10

50

30

96.5

The organic compounds which are derivative of hydrocarbons of oxygen are:

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Carbohydrates

Phenols

Alcohals

All of these

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

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4th

5th

6th

7th

Raney - nickel is the alloy of Ni with

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Pt

Al

Cu

Pd

The color of ppts formed by Fehling's test is

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Brick red

Red

Yellow

Orange

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

Balmer's series is in ______ region

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Visible

U V

I. R.

None

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?

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It will react with water to liberate oxygen

Its hydroxide will be a strong alkali in water

Its carbonate will decompose on heating to give carbon dioxide

Its nitrate on heating will give nitrogen dioxide and oxygen

What is the molarity of a solution containing 15.0 g urea in 500 cm³of solution

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0.5 M

1 M

1.5 M

2 M

When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is

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Propane

Propylene

Acetaldehyde

Acetone

In Lucas test teriary alcohol make an oily layer

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Immediately

In 10 mins

On heating

Not

Which of the following does not turn Schiff's reagent to pink?

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Formaldehyde

Bezaldehyde

Aceton

Methyl chloride

To calculate volume of the solvent, we need to know, the :

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Density of solute

Normality of solute

Mass of solute

Molarity of solute

For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their

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Activation energy

Average energy

Potential energy

Collisions frequency

If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees

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109.5°

107.5°

104.5°

None

Acidic hydrolysis of acetamide gives

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Acetaldehyde

Acetic acid

Methyl amine

Formic acid

Glutamic acid, aspartic acid are ______ amino acid

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Acidic

Basic

Neutral

None of these

Which one gives acidic reactions?

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CH₃----C≡C-------CH₃

CH₃-----CH₂-----HC=CH----CH₂

CH₃----CH=CH₂

CH₃-----C≡CH

When benzene is burnt in free supply of air, it is completely oxidized to

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CO

CO₂₊H₂O

H₂CO₃

None

Which of the following is a non-typical transition elements

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Cr

Mn

Zn

Fe

Sodium metal is obtained by the electrolysis of fused NaCl in cell is called

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Nelson's cell

Down's cell

Daniell cell

Voltaic cell

N₂ + 3H₂ ⇌2NH₃

The unit of K_c for tis reaction will be:

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mol² dm^-6

mol^-2 dm⁺⁶

mol dm^-3

mol^-1 dm⁺³

Grignard's reagent on treatment with carbonyl compounds yield

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Pheonol

Alcohol

Alkane

None of these

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

Which is an essential constituent of chlorophyll

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Be

Fe

Mg

Ca

Chemical reactivity of elements depends upon their characteristic:

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Shape.

Color.

Electronic configuration.

Sizes

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