Formula unit mass of $Z n O$ is :

85

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90

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81

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89

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Solution

The correct option is B $81$
Formula unit mass of $Z n O$ is
$= (1 \times a t o m i c m a s s o f Z n) + (1 \times a t o m i c m a s s o f O)$
$= 1 \times 65 + 1 \times 16$
$= 81 u .$
Option $C$ is correct.

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Similar questions

Q. The unit digit of the product

81 \times 82 \times 83 \times 84 \times 85 \times 86 \times 87 \times 88 \times 89

Q. What is the formula mass unit of ZnO?

Q. The following marks were obtained by the students in a test

81, 72, 90, 90, 86, 85, 92, 70, 71, 83, 89, 95, 85, 79, 62

.
What is the range of the marks obtained?

Q. Calculate the formula unit masses of

Z n O, N a_{2} O, K_{2} C O_{3}

.
(atomic masses of

Z n = 65 u, N a = 23 u, K = 39 u, C = 12 u

and

O = 16 u

)

The marks obtained by 10 students in a class are as follows. What is the probability that the average mark obtained by a student in the class is less than 70?(in decimals)

$\begin{matrix} S t u d e n t & E n g l i s h & H i n d i & M a t h e m a t i c s & S c i e n c e 1 & 87 & 78 & 90 & 89 2 & 90 & 68 & 76 & 78 3 & 79 & 68 & 59 & 61 4 & 71 & 67 & 79 & 57 5 & 69 & 91 & 86 & 76 6 & 87 & 85 & 67 & 60 7 & 78 & 90 & 89 & 93 8 & 92 & 76 & 88 & 90 9 & 77 & 81 & 85 & 86 10 & 86 & 75 & 93 & 89 \end{matrix}$

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Formula unit mass of ZnO is :

The correct option is B 81Formula unit mass of ZnO is =(1×atomic mass of Zn)+(1×atomic mass of O)=1×65+1×16=81u.Option C is correct.

Formula unit mass of $Z n O$ is :

The correct option is B $81$
Formula unit mass of $Z n O$ is
$= (1 \times a t o m i c m a s s o f Z n) + (1 \times a t o m i c m a s s o f O)$
$= 1 \times 65 + 1 \times 16$
$= 81 u .$
Option $C$ is correct.