Download App

STD 11 - 2. structure of atom — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 2. structure of atom4 Marks
MCQ
Given below are two statements.

Statement $I:$ According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.

Statement $II:$ According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • A
    Both Statement $I$ and Statement $II$ are false
  • B
    Both Statement $I$ and Statement $II$ are true
  • ✓
    Statement $I$ is false but Statement $II$ is true
  • D
    Statement $I$ is true but Statement $II$ is false
✓

Answer

Correct option: C.
Statement $I$ is false but Statement $II$ is true
c
Velocity of electron in Bohr's atom is given by

$\mathrm{V} \propto \frac{\mathrm{Z}}{\mathrm{n}}$

$Z=$ atomic number of atom, corresponds to $+v e$ charge so as $Z$ increase velocity increases so statement$-I$ is wrong.

and as $'n'$ decreases velocity increases so statement$-II$ is correct.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Chlorine reacts with ethanol to give
→
$N{H_3} + {O_2}\xrightarrow[\Delta ]{{Pt}}A + {H_2}O$ ;

$A + O_2 \to B$ ;

$B + O_2 + H_2O \to C$

$A, B$ and $C$ are

→
$D-$ Glucose $\xrightarrow[\Delta ]{HN{{O}_{3}}} (A)$; Product $(A)$ is
→
In which reaction last product is $Ph -C \equiv CH$ ?
→
Aqueous solutions of two compounds $M_1 - O - H$ and $M_2 - O - H $ are  prepared in two different beakers. If, the electronegativity of $M_1 = 3.4, M_2 =  1.2, O = 3.5$ and $H = 2.1,$ then the nature of two solutions will be respectively
→
Which of the following liberate hydrogen on reaction with dilute ${H_2}S{O_4}$
→
Which of the following statements are correct about $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ ?

$A$. They exhibit high enthalpy of atomization as the d-subshell is full.

$B$. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+\mathrm{I}$ and + $II.$

$C$. Compounds of $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature.

$D$. $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals.

Choose the most appropriate from the options given below:

→
Consider the following complex ions, $P, Q$ and $R$.

$P =\left[ FeF _6\right]^{3-}, Q =\left[ V \left( H _2 O \right)_6\right]^{2+} \text { and } R =\left[ Fe \left( H _2 O \right)_6\right]^{2+} \text {. }$

The correct order of the complex ions, according to their spin-only magnetic moment values (in $B.M.$) is

→
The limiting molar conductivities of $NaI , NaNO _{3}$ and $AgNO _{3}$ are $12.7,12.0$ and $13.3 \,m\,S m ^{2} \,mol ^{-1}$, respectively (all at $25^{\circ} C$ ). The limiting molar conductivity of $AgI$ at this temperature is $....\,m\,S m ^{2}\, mol ^{-1}$
→
Which statement is NOT correct for p-toluenesulphonyl chloride?
→