In an atom, an electron is moving with a speed of 600 m/s with an

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.

For preparing 3.00 L of 1M NaOH by mixing portions of two stock solutions (A and B) of 2.50 M NaOH and 0.40 M NaOH respectively. Find out the amount of B stock solution (in L) added.

  • 8.57 L

  • 2.14 L

  • 1.28 L

  • 7.51 L


2.

The Vividh Bharti Station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (Kilohertz). Calculate the wavelength (λ) of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to?

  • 319.4 m and X-rays

  • 319.4 m and radiowave

  • 219.3 m and microwave

  • 219.3 m and radiowave


Advertisement

3.

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainty with which the position of the electron can be located is

(Given, h= 6.6 x 10-34 kg m2 s-1, mass of electron em = 9.1 x 10-31 kg)

  • 215 x 10-3 m

  • 2.78 x 10-3 m

  • 1.92 x 10-3 m

  • 3.24 x 10-3 m


C.

1.92 x 10-3 m

Given that velocity of electron, v = 600 m/s

Accuracy of velocity = 0.005%

 v = 600 × 0.005100 = 0.03

According to Heisenberg's uncertainty principle

x . mv  h4π

x = 6.6 × 10-344 × 3.14 × 9.1 × 10-31 ×0.03

x =1.92 × 10-3 m


Advertisement
4.

What would be the heat released when an aqueous solution containing 0.5 mole of HNOis mixed with 0.3 mole of OH-?  (enthalpy of neutralisation is- 57.1 kJ)

  • 28.5 kJ

  • 17.1 kJ

  • 45.7 kJ

  • 1.7 kJ


Advertisement
5.

The number average molar mass and mass average molar mass of a polymer are respectively 30,000 and 40,000. The
polydispersity index (PDI) of the polymer is 

  • -1

  • 0

  • > 1

  • < 1


6.

The charge/size ratio of a cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of the cationic species, K+, Ca2+, Mg2+, Be2+?

  • K< Ca2+ < Mg2+ < Be2+

  • Be2+ < K2+ < Ca2+ < Mg2+

  • Mg2+< Be2+ < K+ < Ca2+

  • Ca2+ < Mg2+ < Be+ < K+


7.

In an amino acid, the carboxyl group ionises at pKa = 2.34 and ammonium ion at pKa2 = 9.60. The isoelectric point of the amino acid is at pH

  • 4.32

  • 3.34

  • 9.46

  • 5.97


8.

0.40 g of helium in a bulb at a temperature of T K had a pressure of p atm. When the bulb was immersed in water bath at temperature 50 K more than the first one, 0.08 g of gas had to be removed to restore the original pressure. T is

  • 500 K

  • 400 K

  • 600 K

  • 200 K


Advertisement
9.

What percentage of β-D-(+-glucopyranose is found at equilibrium in the aqueous solution?

  • 64%

  • 36%

  • 100%

  • 50%


10.

Which of the following is correctly arranged in order of increasing weight?

  • 0.0105 equivalent of H2CO2 ·2H2O < 0.625 g of Fe < 0.006 g atom of Ag <6.0 x 1021 atoms of Zn

  • 0.625 g of Fe < 0.0105 equivalent of H2C2O4 ·2H2O < 6.0 x 1021 atoms of Zn < 0.006 g atom of Ag 

  • 0.625 g of Fe < 6.0 x 1021 atoms of Zn < 0.006 g atom of Ag < 0.0105 equivalent of H2C2O4 ·2H2O

  • 0.0105 equivalent of H2C2O4. 2H2O < 0.006 g atom of Ag <6.0 x 1021 atoms of Zn < 0.625 g of Fe


Advertisement