K2Cr2O7 in acidic medium converts into from Chemistry NEET Year

Subject

Chemistry

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following element has lowest melting point?

  • Cr

  • Fe

  • Ni

  • Cu


2.

Maximum number of unpaired electrons are present in

  • Gd3+

  • Yb2+

  • Tb2+

  • Pm3+


3.

Total number of antibonding electrons present in O2 will be

  • 6

  • 8

  • 4

  • 2


4.

In BF3, the B - F bond length is 1.30Å, when BF3 is allowed to be treated with Me3N, it forms an adduct, Me3N BF3, the bond length of B - F in the adduct is

  • greater than 1.30 Å

  • smaller than 1.30 Å

  • equal to 1.30 Å

  • none of these


Advertisement
5.

Which of the following is most basic?

  • Al(OH)3

  • Cr(OH)3

  • La(OH)3

  • Fe(OH)3


Advertisement

6.

K2Cr2O7 in acidic medium converts into

  • Cr2+

  • Cr3+

  • Cr4+

  • Cr5+


B.

Cr3+

K2Cr2O7 in acidic medium converts into Cr3+. Since it is an oxidising agent, it undergoes reduction, i.e. decrease in oxidation state.

Cr2O72- + 14H+ + 6e- 2Cr3+ + 7H2O


Advertisement
7.

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 x 10-4 then particle is

  • neutron

  • α- particle

  • deuteron

  • tritium


8.

What will be the solubility product of AX3?

  • 27S4

  • 4S3

  • 36S4

  • 9S3


Advertisement
9.

Which thermodynamic parameter is not a state function?

  • q at constant pressure

  • q at constant volume

  • W at adiabatic

  • W at isothermal


10.

Assertion : Bond dissociation energy is F2 > Cl2.

Reason : Cl2 has more electronic repulsion than F2.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


Advertisement