Download App

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

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
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

More "M.C.Q (1 Marks)" from 4. d and f- block elements→4. d and f- block elements — all question types→Chemistry STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Ferrous sulphate on heating gives
→
A brown ring is formed in the ring test for $\text{NO}_3^-$ ion. It is due to the formation of
→
Which of the following species show maximum volatility?
→
The order of melting point of ortho, para, meta-nitrophenol is
→
Choose the correct statement.
→
Correct order of bond angle for bond will be 
→
The major product of the following reaction is
→
Which of the following is the best scientific method to test presence of water in a liquid
→
The product of the following reaction is:
Image
→
Iron displaces copper from its salt solution, because
→