Some Basic Concepts of Chemistry Quiz-6

Question 1

How many moles of electron weighs one kilogram?

Accepted Answer

$\frac1{ 9.108 \times 6.023} \times 10^8 $

Answer

$6.022 \times10^{23}$

Answer

$\frac1 { 9.108 }\times 10^{23} $

Answer

$\frac{6.022} { 9.108 }\times10^{23}$

Question 2

Which has maximum number of atoms? (At. wts are given within brackets)

Accepted Answer

24g of C(12)

Answer

56g of Fe(56)

Answer

27g of Al(27)

Answer

108g of Ag(108)

Question 3

Dissolving 120g of urea (mol. wt. 60) in 1000g of water gave a solution of density 1.15 g/mL. The molarity of the solution is :

Accepted Answer

2.05 M

Answer

1.78 M

Answer

2.00 M

Answer

2.22 M

Question 4

The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl and 250 mL of 2.0 M HCl will be :

Accepted Answer

0.875 M

Answer

1.00 M

Answer

1.75 M

Answer

0.0975 M

Question 5

The highest mass corresponds to which of the following :

Accepted Answer

1 mole of $O_2$

Answer

1 molecule of $O_2$

Answer

$1\times10^{-23}g$ mole of $O_2$

Answer

an $O^{2-}$ion

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