Page Number- 7

(1) Permanent hardness किसके कारण होती है??

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

(2) H2O2 को store करने पर इसे stabilise करने के लिए कौन सा पदार्थ मिलाया जाता है??

  • A. Alkali salt (क्षार नमक)
  • B. Dust (धूल)
  • C. Charcoal (लकड़ी का कोयला)
  • D. Urea (यूरिया)
0
(d) Urea (यूरिया)

(3) Law of constant composition किसमें मान्य नहीं है??

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

(4) Law of constant composition किसमें मान्य नहीं है??

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

(5) Potassium का flame colour क्या है??

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

(6) Potassium का flame colour क्या है??

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

(7) Soda ash क्या है??

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

(8) जब CO2 lime water से गुजरती है, तो यह किस कारण से milky हो जाती है??

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

(9) Bleaching powder का formula क्या है??

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

(10) Plaster of Paris का formula क्या है??

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