Page Number- 7

(1) Permanent hardness is due to??

  • A. MgCl2
  • B. Cacl2
  • C. CaSo4
  • D. All of these
0
(d) All of these

(2) Which substance is added to stabilise H2O2 when it is stored??

  • A. Alkali salt
  • B. Dust
  • C. Charcoal
  • D. Urea
0
(d) Urea

(3) The law of constant composition does not hold in??

  • A. Ionic hydrides
  • B. Covalent hydrides
  • C. Metallic hydrides
  • D. All of these
0
(c) Metallic hydrides

(4) The law of constant composition does not hold in??

  • A. Ionic hydrides
  • B. Covalent hydrides
  • C. Metallic hydrides
  • D. All of these
0
(c) Metallic hydrides

(5) The flame colour of potassium is??

  • A. Crimson red
  • B. Yellow
  • C. Violet
  • D. Blue
0
(c) Violet

(6) The flame colour of potassium is??

  • A. Crimson red
  • B. Yellow
  • C. Violet
  • D. Blue
0
(c) Violet

(7) Soda ash is??

  • A. Na2Co3.10H2O
  • B. Na2Co3.9H2O
  • C. Na2Co3.5H2O
  • D. Na2Co3
0
(d) Na2Co3

(8) When CO2 is passed through lime water it turns milky due to??

  • A. Cao
  • B. Ca(OH)2
  • C. CaCo3
  • D. Cacl2
0
(c) CaCo3

(9) Formula of bleaching powder??

  • A. Be(NO3)2
  • B. Caocl2
  • C. H2SO4(CO)3
  • D. None of these
0
(b) Caocl2

(10) Formula of plaster of Paris??

  • A. CaSo4.½H2O
  • B. CaSo4.2H2O
  • C. CaSo4.⅕H2O
  • D. CaSo4.½H3O
0
(a) CaSo4.½H2O
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