Download App

2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Assertion : An atom is electrically neutral
Reason : Atom contains equal number of protons and neutrons.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
Atom is electrically neutral. Atoms necessarily contain equal number of protons and electrons, but not neutrons.

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

More "M.C.Q (1 Marks)" from 2. structure of atom→2. structure of atom — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Which of the following is an electron deficient molecule?
→
In which of the following molecules all the effects namely inductive, mesomeric and hyperconjugation operate ?
→
Relation between $(B)$ and $(C)$ is

$C{H_3} - C \equiv C - H\xrightarrow{{NaN{H_2}}}\xrightarrow{{C{H_3} - I}}(A)\xrightarrow{{Li/liq\,N{H_2}}}(B)$

$C{H_3} - C \equiv C - H\xrightarrow{{NaN{H_2}}}\xrightarrow{{C{H_3} - I}}(A)\xrightarrow[{Pd.CaC{O_3}}]{{{H_2}}}(C)$

→
Radioactive elements emit $a, p$ and $y$ rays and are characterized by their half lives. The radioactive isotope of hydrogen is :
→
The ${K_{sp}}$ of  $Mg{(OH)_2}$ is $1 \times {10^{ - 12}},\,0.01\,M\,Mg{(OH)_2}$ will precipitate at the limiting $pH$
→
$PCl _{5}$ dissociates as

$PCl _{5}( g ) \rightleftharpoons PCl _{3}( g )+ Cl _{2}( g )$

$5$ moles of $PCl _{5}$ are placed in a $200$ $litre$ vessel which contains $2\, moles$ of $N _{2}$ and is maintained at $600 \,K$. The equilibrium pressure is $2.46 \,atm$. The equilibrium constant $K _{ p }$ for the dissociation of $PCl _{5}$ is $......\,\times 10^{-3}$. (nearest integer)

(Given: $R =0.082\, L \,atm \,K ^{-1} \,mol ^{-1}$ : Assume ideal gas behaviour)

→
Ozonolysis of which one of the following will give two molecules of acetaldehyde
→
At $25\,^oC$ a weak acid $HX$ has the dissociation constant $1 \times 10^{-5}$  . It forms a salt $NaX$ on reaction with alkali. The $\%$ of degree of hydrolysis of $0.1\,M$ solution of $NaX$ is .....$\%$
→
What is the relationship between the molecules in the following pairs ?
→
The solubility product of silver sulphide is $3.2 \times {10^{ - 11}}.$ Its solubility at the experimental temperature is 
→