Properties of Alpha, Beta and Gamma Radiations

Q.

How do you calculate the ionization energy of a hydrogen atom in its ground state?

Q.

Which of the ions has the largest ionic radius?

1. Be²⁺

2. Sr²⁺

3. Mg²⁺

4. Ca²⁺

Q.

What are radioactive substances?

Q.

The charge on an electron is 4.8 × 10^-10 esu. What is the value of charge in Li⁺ ion

Q.

On the basis of Rutherfords model of an atom, which subatomic particle is present in the nucleus of an atom?

Q.

What is the actual mass of a proton?

Q.

Which of the following subatomic particles is present in equal numbers in a neutral atom?

1. Protons and neutrons

2. Proton and nucleus

3. Protons and electrons

4. Neutrons and electrons

Q.

Why is the burning of carbon with oxygen considered an oxidation-reduction reaction?

(i)Write the chemical equation for this reaction.

(ii) Identify the substance: (a) getting oxidised (b) getting reduced (c) Oxidising agent (d) Reduced agent

Q.

Rutherfords experiments on scattering of alpha particles proved that:

Q.

Rutherfords alpha particle scattering experiment established that:

Q.

The electrons present in the outermost shell of an atom are called ______ electrons.

Q. Assertion [A]: Alpha rays gets attracted towards the negatively charged plate.
Reason [R]: Alpha ray is negatively charged.

1. (A) and (R) both are correct and (R) is correct explanation of (A) .
2. (A) is correct but (R) is not correct.
3. (A) is not correct but (R) is correct.
4. (A) and (R) both are correct but (R) is not the correct explanation of (A).

Q.

Which of the following equations depicts the oxidizing nature of ${\mathrm{H}}_2{\mathrm{O}}_2$?

1. ${\mathrm{Cl}}_2+{\mathrm{H}}_2{\mathrm{O}}_2\to 2\mathrm{HCl}+{\mathrm{O}}_2$

2. ${\mathrm{KIO}}_4+{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{KIO}}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

3. $2{\mathrm{I}}^{-}+{\mathrm{H}}_2{\mathrm{O}}_2+2{\mathrm{H}}^{+}\to {\mathrm{l}}_2+2{\mathrm{H}}_2\mathrm{O}$

4. ${\mathrm{I}}_2+{\mathrm{H}}_2{\mathrm{O}}_2+2{\mathrm{OH}}^{-}\to 2{\mathrm{l}}^{-}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

Q.

In the reaction, $2\mathrm{Mg}+{\mathrm{O}}_2\to 2\mathrm{MgO}$, _______ is getting oxidised.

Q.

What is the most important discovery made on the basis of alpha ray scattering particles.

Q.

For effective and safe detection of leak, sodium-24 is most likely to be a/an:

1. alpha- emitter

2. beta- emitter

3. gamma- emitter

4. none of these

Q.

Which of the following are true in case of isobars?

1. They have same atomic number.

2. They have same number of protons.

3. They have same number of nucleons.

4. They have same number of neutrons.

Q.

Name three types of radioactive radiations given out by the radioactive elements.

Q.

According to Rutherford's model, the positive charge is concentrated in a very small volume.

1. True

2. False

Q.

___ is used in the treatment of cancer and other diseases.

1. ${}^{60}C{O}_{27}$

2. ${}^{14}{C}_6$

3. ${}^{13}{C}_6$

4. ${}^{131}{I}_{53}$

Q.

A body contains $3$C of positive charge. Does this refer to the total number of protons or positively charged particles present in the body?

Q.

In the reaction:
$2{\mathrm{H}}_2\mathrm{S}+{\mathrm{SO}}_2\to 2{\mathrm{H}}_2\mathrm{O}+3\mathrm{S}$

Choose the statements which is/are false?

1. ${\mathrm{H}}_2\mathrm{S}$ is oxidised.

2. ${\mathrm{SO}}_2$ is reduced.

3. ${\mathrm{H}}_2\mathrm{S}$ is reduced.

4. All are false.

Q.

Give a reason for the following:

The source of the tremendous amount of energy radiated by the Sun is believed to be a nuclear fusion reaction involving the fusion of hydrogen nuclei to form helium.

Q.

State three precautions that must be taken while handling a radioactive source.

Q.

The alpha particle scattering experiment was carried out by:

Q. What is the charge of Gama rays?

Q.

What is the smallest quantum particle?

Q.

Rutherford model of an atom is similar to the _______

Q.

A ---------------------- reaction is a reaction in which both oxidation and reduction take place.

Q.

Neutrons have a mass equal to ______ but have ______ electric charge.