chemistry

EAMCET PREVIOUS PAPER QUESTIONS FORM HYDROGEN AND IT’S COMPOUNDS  PART-1

1.A sample of water contains 3ppm of CaCl₂.The degree of hardness of that water sample is

a) 3

b) 50

c) 100

d) 180

2.Volume of O₂ gas liberated at STP by the decomposition of 15ml of 20 Vol H₂O₂ solution is

a) 150ml

b)300ml

c)200ml

d)250ml

3.In the following reaction H₂O₂ acts as H₂O₂+Ag₂O----->2Ag+H₂O+O₂

a) oxidizing agent

b) reducing agent

c) belaching agent

d)none

4.Permanet hardness is due to the presence of

a) chlorides of Ca and Mg

b) sulphates of Ca and Mg

c) both

d) none

5.H₂O₂ oxidises H₂S to

a) S

b) H₂SO₄

c) H₂S₂O₈

d)H₂SO₅

6.The substance which causes permanent hardness of water is

a)NaCl

b)NaHCO₃

c) MgCl₂

d)K₂SO₄

7.In H₂O₂ the angle between two “O-H” planes is

a) 101.5⁰

b)90⁰

c) 109⁰

d)120⁰

8.When H₂O₂ reacts with Cl₂ the product obtained is

a) O₂

b) H₂

c) ClO₂

d) HOCl

9.At what temperature the density of heavy water will be maximum

a) 0⁰

b)11.6⁰

c) 4⁰

d) 27⁰

10.which of the following is not a ture peroxide

a) PbO₂

b) NaHO₂

c) BaO₂

d) Na₂O₂