तत्व A, B और C डोबेरायनर के त्रिक के रूप में हैं। यदि A का परमाणु भार 40 है और C का परमाणु भार 137 है, तो B का परमाणु भार कितना होगा?

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RRB ALP Previous Paper 2 (Held On: 9 Aug 2018 Shift 2)
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  1. 35
  2. 120
  3. 88
  4. 74

Answer (Detailed Solution Below)

Option 3 : 88
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  • डोबेरायनर त्रिक के नियम के अनुसार, त्रिक में बीच वाले तत्व का परमाणु भार, अन्य दो तत्वों के परमाणु भार का समांतर माध्य होता है।
  • यदि A, B, और C डोबेरायनर त्रिक के तत्व हैं, तो B का परमाणु भार A और C के परमाणु भार के समांतर माध्य के बराबर होगा।

तत्व

B

C

B = (A + C)/2

परमाणु भार

40

137

 = (40 + 137)/2 ≈ 88

परमाणु क्रमांक

20

56

38

तत्व

कैल्शियम

बेरियम

स्ट्रोंशियम

 

इसलिए, तत्व B का परमाणु भार 88 है।
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