Important Questions of Some Basic Concepts of Chemistry Chemistry | Zigya

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

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

Advertisement
271.

The number of atoms in 0.1 moles of a triatomic gas is (NA = 6.02 x 1023 mol-1)

  • 6.026 x 1022

  • 1.806 x 1023

  • 3.600 x 1023

  • 3.600 x 1023

865 Views

272.

10 g of hydrogen and 64 of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be


  • 2 mol

  • 3 mol

  • 4 mol

  • 4 mol

422 Views

273.

Number of moles of MnO4- required to oxidies one mole of ferrous oxalate completely in acidic medium will be 

  • 0.6 mole

  • 0.4 mole

  • 7.5 mole

  • 7.5 mole

407 Views

274.

An Organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

  • CH3O

  • CH2O

  • CHO

  • CHO

480 Views

Advertisement
275.

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

  • 0.044

  • 0.333

  • 0.011

  • 0.011

449 Views

276.

An element, X has the following isotopic composition;


200X: 90%

199X : 8.0%

202X ; 2.0 %

The weighted average atomic mass of the naturally -occurring element X is closet to:

  • 200 amu

  • 201 amu

  • 202 amu

  • 202 amu


277.

Work is being performed, when a weight lifter lifts a base ball off a weight rack. This is due to

  • magnetic attraction

  • gravity

  • electrostatic repulsion

  • mechanical force


278.

11.2 L of gas at STP Weight 14g. The gas would be

  • H2

  • CO

  • B2H6

  • All of these


Advertisement
279.

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


280.

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