Download App

STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 4. d and f- block elements4 Marks
MCQ
Which of the statements is not true?
  • A
    On passing $H_2S$ through acidified $K_2Cr_2O_7$ solution, a milky colour is observed.
  • ✓
    $Na_2Cr_2O_7$ is preferred over $K_2Cr_2O_7$ in volumetric analysis.
  • C
    $K_2Cr_2O_7$ solution in acidic medium is orange.
  • D
    $K_2Cr_2O_7$ solution becomes yellow on increasing the $pH$ beyond $7$
✓

Answer

Correct option: B.
$Na_2Cr_2O_7$ is preferred over $K_2Cr_2O_7$ in volumetric analysis.
b
Nylon $- 66$ is a fibre as in it the forces of attraction are $H-$ bonding not a elastomer.

All other given statements are true.

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

Which of the following is the correct statement for red lead
→
Maltose contains how many oxygen atoms
→
Aniline-water mixture can be separated by
→
The electronic configuration together with the quantum number of last electron for lithium is
→
Which one among the following does not have the hydrogen bond
→
On introducing a catalyst at $500\,K,$ the rate constant of a first order reaction increases $2.718$ times. If the activation energy in the presence of a catalyst is $4.15\, kJ\, mol^{-1}.$ Then what will be $E_a$ in absence of catalyst (value of $e = 2.718$ ) ......... $kJ$
→
Out of the following 0.1 molal aqueous solutions which will have maximum freezing point?
→
In the metallurgy of aluminium, cryolite is mixed in the molten state because it
→
Which of the following metal does not react with the solution of copper sulphate
→
Regarding $F^-$ and $Cl^-$ which of the following statements is/are correct ?

$(i)\,\, Cl^-$ can give up an electron more easily than $F^-$

$(ii) \,\,Cl^-$ is a better reducing agent than $F^-$

$(iii)\,\, Cl^-$ is smaller in size than $F^-$

$(iv)\,\, F^-$ can be oxidized more readily than $Cl^-$

→