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Standard IX

Chemistry

Properties of Alpha, Beta and Gamma Radiations

Statement I: ...

Question

Statement I: $_{2}^{4} H e$ is the correct symbol for an alpha particle
Because
Statement II: An alpha particle is a helium $- 3$ nucleus

True True CE

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True False

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False True

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False False

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Solution

The correct option is C True False
Statement I: $_{2}^{4} H e$ is the correct symbol for an alpha particle.

Because :

Statement II: An alpha particle is a helium−4 nucleus.

it contains 2 protons and 2 neutrons.

Hence, the statement I is correct and statement II is false.

The correct option is C.

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Similar questions

Q. Each of these questions contains two statements, Statement 1(Assertion) and Statement 2(Reason).

Statement-I : If sum of n terms of a series is

6 n^{2} + 3 n + 1

, then the series is in A.P.

Statement-II : Sum of n terms of an A.P. is always of the form

a n^{2} + b n

, where

a

and

b

are constant.

State which of the following is correct :

(A) Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
(B) Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I
(C) Statement-I is true, Statement-II is false
(D) Statement-I is false, Statement-II is true

Q. A logical binary relation

⨀

, is defined as follows:

\begin{matrix} A & B & A ⨀ B T r u e & T r u e & T r u e T r u e & F a l s e & T r u e F a l s e & T r u e & F a l s e F a l s e & F a l s e & T r u e \end{matrix}

Let

\sim

be the unary negation (NOT) operator, with higher precedence, than

⨀

. Which one of the following is equivalent to

A \land B

This question has statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two statements. Statement I A point particle of mass m moving with speed v collides with stationary point particle of mass M. If the maximum energy loss possible is given as $f (\frac{1}{2} m v^{2}), t h e n f = (\frac{m}{M} + m)$ Assertion and Reason

Statement - I: $C l^{-} a n d C a^{2 +}$ are isoelectronic species.
Statement - II: Isoelectronic species should have same charges.

Statement - I: $C d$ is a transition element.
Statement - II: $C d$ and $C d^{2 +}$ both have completely filled $d -$ orbitals in their ground state.

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Statement I: 42He is the correct symbol for an alpha particleBecauseStatement II: An alpha particle is a helium−3 nucleus

The correct option is C True FalseStatement I: 42He is the correct symbol for an alpha particle.Because :Statement II: An alpha particle is a helium−4 nucleus.it contains 2 protons and 2 neutrons.Hence, the statement I is correct and statement II is false.The correct option is C.

Statement I: $_{2}^{4} H e$ is the correct symbol for an alpha particle
Because
Statement II: An alpha particle is a helium $- 3$ nucleus