How many significant figures are present in 0.0000135? from Chem

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The amount of BaSO4 precipitated on mixing BaCl2 (0.5 M) with H2SO4 (1 M) will correspond to

  • 0.5 M

  • 1.0 M

  • 1.5 M

  • 2.0 M


2.

One mole of SO3 was placed in a vessel of 1 L capacity at a certain temperature and the following equilibrium was established.

2SO3 (g)  2SO2 (g) + O2 (g)

If 0.6 moles of SO2 were formed at equilibrium, Kc for the reaction will be

  • 0.036

  • 0.45

  • 0.54

  • 0.675


3.

α-particles can be detected by using

  • thin aluminium sheet

  • barium sulphate

  • zinc sulphide screen

  • gold foil


4.

The pair of amphoteric hydroxides is

  • Be(OH)2, Al(OH)3

  • Al(OH)3, LiOH

  • B(OH)3, Be(OH)2

  • Be(OH)2, Mg(OH)2


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5.

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, U and w correspond to

  • U < 0, w = 0

  • U < 0, w < 0

  • U > 0, w = 0

  • U > 0, w > 0


6.

In a decay process XZA changes into YZ-1A. Which process is this?

  • β-decay

  • β+ decay

  • α- decay

  • γ- decay.


7.

Which of the following arrangement is possible?

  • n l m s
    5 2 2 +1/2
  • 2 2 0 -1/2
  • 3 -2 1 +1/2
  • 0 0 1 +1/2

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8.

How many significant figures are present in 0.0000135?

  • 7

  • 8

  • 4

  • 3


D.

3

Significant numbers in 0.0000135 are 3. It is because zeros to the left of the first non-zero digitin a number are not significant.


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9.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason: The bond length of N2 is shorter than that of oxygen.

  • 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.


10.

Assertion : NF3 is a weaker ligand than N(CH3)3.

Reason : NF3 ionizes to give F- ions in aqueous solution.

  • 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.


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