Question # 1

Choose an answer

RCH(CH₃)CO₂H + CH₃OH

RCH(CH₃)CO₂H + HCO₂H

RCH(CH₃)OH + CO₂

RCH(CH₃)OH + HCO₂H

The formula of lime stone is

Choose an answer

CaCl₂

MgCO₃

Na₂CO₃

CaCO₃

Potassium superoxide has a use in breathing equipment in space crafts. The balanced equation for the reaction is

Choose an answer

Which of the following is not the reactions of lithium

Choose an answer

Plaster of pares is obtained by heating

Choose an answer

Gypsum

Epsom

Lime stone

Dolomite

The weight of pure NaOH required to prepare 250 cm³of 0.1 N solution is

Choose an answer

4 g

1 g

2 g

5 g

By applying Hess's law, we can calculate

Choose an answer

ΔH

ΔS

ΔF

K

The osmotic pressure of solution increases if

Choose an answer

Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

Products of coal is:

Choose an answer

Peat

Lignite

Bituminous coal

All above

Which of these always applies to a nucleophile

Choose an answer

It attacks a double bond

It has a lone pair of electrons

It is single atom

It is negatively charged

While balancing an equation by ion electron method, the number of oxygen atoms are balanced by

Choose an answer

OH^-

H₂O

O₂

H⁺

The elements with atomic numbers 9, 17, 35, 53, 85 an all

Choose an answer

Noble gases

Halogens

Heavy metals

Light metals

which one of the following is a heteroheneous catalysis

Choose an answer

Which substances are mixed to form a buffer solution?

Choose an answer

A strong acid and its salt of a strong base

Strong acid and its salt of weak base

Weak acid and its salt of strong base

Weak acid and its salt of weak base

Mark the correct statement

Choose an answer

Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

Which technique is used to determine the absorption of radiations?

Choose an answer

Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

The function of salt bridge in the galvanic or voltaic cell is to

Choose an answer

Carry out oxidation at anode

To carry out reduction at cathode

Carry out electrolysis

To prevent the net charge accumulation in either of the half cells

At present oil refineries in Pakistan are:

Choose an answer

One

Two

Three

Four

Ionization energy depends upon

Choose an answer

Nuclear charge

Atomic size

Shielding effect

All of the above

CH₃CH₂COOH is also named as:

Choose an answer

Propionic acid

Propanoic acid

Acetic Acid

Both (a) and (b)

The reference calomel electrode is made from which of the following?

Choose an answer

ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

Acetic acid is 1.33% ionized, In 1000 molecules of 0.1 M acetic acid the number of H⁺ions is

Choose an answer

1.33

13.3

1.33

1

Choose an answer

2, 3-dimethylbutane

2, 3-methylbutane

2-dimethylbutane

Dimethylbutane

Choose an answer

It decolourises aqueous bromine rapidly

It is insoluble in water

It reduces Fehling's reagent

Two molecules react with each other in the presence of a strong acid

Substitution of halogen in the benzene ring requires catalyst

Choose an answer

AlCl₃

FeCl₃

SiO₂

Organo - nickel

The amount of heat evolved or absorbed in a chemical reaction, when the molar quantities of products and reactants being the same as represented in chemical equation. is called

Choose an answer

Heat of reaction

Free energy of reaction

Entropy of reaction

None of these

A limiting reactant is the one which

Choose an answer

Is taken in lesser quantity in grams as compared to other reactants

Is taken in lesser quantity in volume as compared to other reactants

Gives the maximum amount of the product which is required

Gives the minimum amount of the product under consideration

Saturated solution of a solid is prepared at a constant temperature. 100 cm³of this saturated solution is evaporated in a china dish. The mass of the residue is called

Choose an answer

Azetropic mixture

Solubility

Solubility product

Equilibrium constant

In the ground state of an atom, the electron is present:

Choose an answer

In the nucleus.

In the second shell.

Nearest to the nucleus.

farthest from the nucleus.

Cotton has cellulose in it:

Choose an answer

96%

97%

98%

99%

Anode is the surface on which probability of finding electron is:

Choose an answer

50%

Less than 10%.

More than 95%.

Zero.

More Classes

Other Links

ECAT Chemistry Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer