Question # 1

Choose the value of the Redberg's constant among the following among the following

Choose an answer

1.09678 x 10⁷m^-1

1.9678 x 10⁷m^-1

1.697 x 10⁷m^-1

1.007 x 10⁷m^-1

The S.I unit of heat and energy is;

Choose an answer

watt

calorie

joules

none of all

Which have better penetrating power

Choose an answer

Alpha rays

Beta rays

Gamma rays

X-rays

Why is the second ionization energy of the higher than the first ionization energy?

Choose an answer

the size of the ion decreases after removal of an electron

the effective nuclear charge increases

the distance of the valence electron from the nucleus decreases

all of the above

Positive rays produce in discharge tube from

Choose an answer

Electricity

Gas molecule

Anode

Cathode

The set of orbitals having n + l = 5 are

Choose an answer

2p, 3d, 3s

3s, 4p, 4d

3p, 3d, 5s

5s, 4p, 3d

Enthalpy of an exothermic reaction is always

Choose an answer

Positive

Negative

Zero

May be positive or negative

An exothermic reaction is one in which the reacting substances

Choose an answer

Have more energy than the products

Have less energy than the products

Have the same energy as the products

Are at a higher temperature than the products.

Quantum number value for 2p orbitals are:

Choose an answer

n = 2, I = 1

n = 1, I = 2

n = 1, I = 0

n = 2, I = 0

kinetic energy of molecules is due to:

Choose an answer

vibration motion

translational motion

rotational motion

all of above

A particular reaction has a negative value for the energy change.Then at ordinary temperature

Choose an answer

It has a large -ve value for the entropy change

It has a large +ve value for enthalpy change

It has small +ve value for enthalpy change

It has a +ve value for the entropy change and a -ve value for the enthalpy change.

The unite which indicates the largest amount of energy is;

Choose an answer

joule

electron-volt

calorie

erg

A spontaneous change means:

Choose an answer

a lowering of free energy

a lowering of energy

an increase in internal energy

no energy change

Which of the followings is not charged particle

Choose an answer

proton

electron

neutron

hydrogen nucleus

When cathode rays strike the anode metal. X-rays are emitted and not the positive rays because

Choose an answer

cathode rays are material particles

cathode rays knock out electrons from anode which emit X-rays when outer electrons take their place

cathode rays are absorbed by the nucleus

cathode rays become heated

Which are not electromagnetic radiations

Choose an answer

X-rays

Sound waves

Proton

Radio waves

System in which there is no exchange of matter,work or energy from surroundings

Choose an answer

Closed

Isolated

Adiabatic

Isothermal

The gaseous oxides of nitrogen have positive enthaply changes of formation. Which factor is likely to make the most significant contribution to these enthalpy change

Choose an answer

the high bond energy of the nitrogen molecule, N₂

the high electron affinity of oxygen atoms

the similarity of the electronegativities of oxygen and nitrogen

the high electron affinity of oxygen atoms

If at 298 K the bond energies of C-H,C-C,C=C and H-H bonds are respectively 414, 347,and 435 kJ mol-1 the value of enthalpy change for the reaction H₂C = CH₂ (g) + H₂(g) → H₃C - CH₃(g) at 298 K will be

Choose an answer

+250 kJ

-250 kJ

+125 kJ

-125 kJ

Which of the following is not a property of cathode rays

Choose an answer

they can produce x-rays when they strike a heavy metal anode

they can cause reduction reaction

they produce fluorescences in rare earth and minerals

they comprise neutral particles

The size of electronic shell is described by

Choose an answer

azimuthal Q.No

magnetic Q.No

spin Q.No

principal Q.No

More Classes

Other Links

MDCAT Chemistry Chapter 3 Atomic Structure 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