कथन : कुछ पक्षी समान जलवायु वाले प्रदेशों में अंडे देने के लिए प्रवास करते हैं। कारण : उनके लिए पश्चिम से पूर्व या पूर्व से पश्चिम जाना अनिवार्य होता है।
निम्नलिखित कथन और कारण को ध्यानपूर्वक पढ़कर दिए गए विकल्पों से सही उत्तर चुनकर लिखिए : कथन : कुछ पक्षी ...
Read moreपक्षी ऊँचे अक्षांशों से निचले अक्षांशों की ओर क्यों जाते हैं ?
प्रश्न – पक्षी ऊँचे अक्षांशों से निचले अक्षांशों की ओर क्यों जाते हैं ?I. प्रवास के उद्देश्य सेII. अधिक सर्दी ...
Read moreAssertion (A): Boiling point of (C2H5)2NH is lower n-C4H9NH2. Reason (R): Hydrogen bonding is much more extensive in (C2H5)2NH as compared to n-C4H9NH2.
Assertion (A): Boiling point of (C2H5)2NH is lower than that of n-C4H9NH2.Reason (R): Hydrogen bonding is much more extensive in ...
Read moreAssertion (A): Actinoid contraction is greater from element to element than lanthanoid contraction. Reason (R): Actinoids show wide range of oxidation states.
Assertion (A): Actinoid contraction is greater from element to element than lanthanoid contraction.Reason (R): Actinoids show wide range of oxidation ...
Read morealpa -D-glucose and ẞ-D-glucose differ from each other with respect to the:
alpa -D-glucose and ẞ-D-glucose differ from each other with respect to the:(A) size of the hemiacetal ring(B) configuration at the ...
Read moreIn the Arrhenius equation k = Ae En/RT, ‘A’ represents :
In the Arrhenius equation k = Ae En/RT, ‘A’ represents :(A) effective collisions(B) frequency factor(C) fraction of collisions(D) threshold energy ...
Read moreThe primary and secondary valences of Co in [Co(en)3]Cl3 respectively are:
The primary and secondary valences of Co in [Co(en)3]Cl3 respectively are:(A) 3,3(B) 0,3(C) 6,3(D) 3,6 Correct Answer : Option (D) ...
Read moreWe cannot measure the resistance of an ionic solution using DC because:
We cannot measure the resistance of an ionic solution using DC because:(A) it changes the composition of the solution.(B) it ...
Read moreThe strongest base in aqueous solution among the following amines is:
The strongest base in aqueous solution among the following amines is:(A) (C2H5)2NH(B) (C2H5)3N(C) C2H5NH2 (D) C6H5NH2 Correct Answer : Option ...
Read moreThe reagent that can be used to convert benzenediazonium chloride of benzonitrile is:
The reagent that can be used to convert benzenediazonium chloride of benzonitrile is:(A) Cu/HCI(C) CuCN(B) CH3CN(D) AgCN Correct Answer : ...
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