What is the packing efficiency and number of atoms per unit cell in the crystal structure of metal M which has the ABABAB type arrangement of atoms in it?

धातु M की उस क्रिस्टल संरचना में संकुलन क्षमता तथा प्रति एकक कोष्ठिका परमाणुओं की संख्या क्या है जिसमें परमाणुओं की ABABAB प्रकार की व्यवस्था है?

68%, 2

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52.4%, 1

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74%, 4

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74%, 6

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The correct option is D 74%, 6
Solution

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This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : A metal having ccp structure has 4 atoms per unit cell.
A : ccp संरचना वाली एक धातु में प्रति एकक कोष्ठिका 4 परमाणु होते हैं।

R : Number of tetrahedral voids in a ccp unit cell is 8.
R : ccp एकक कोष्ठिका में चतुष्फलकीय रिक्तियों की संख्या 8 होती है।

Q. If a metal crystallises in fcc lattice then the packing fraction of its unit cell will be

यदि एक धातु fcc जालक में क्रिस्टलीकृत होती है, तो इसकी एकक कोष्ठिका का संकुलन प्रभाज होगा

Q. The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [

a_{0}

is Bohr radius]:

The heats of neutralisation of $C H_{3} C O O H$ , HCOOH, HCN and $H_{2} S$ are -12.8, -13.2, -3.2 and -3.9 kcal per equivalent. Arrange these acids in increasing order of strength.

Q. If A is

P h C {+ H}_{2}

and B is

C H_{2} = C H - C {+ H}_{2}

, the greater number of resonating structure is of__________.

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The correct option is D 74%, 6Solution

The correct option is D 74%, 6
Solution