Litmus paper turns blue in a basic solution
so B
Answer:
Explanation:
The 1000-ml graduated cylinder with marks every 100 ml has least count of 100 ml . It means it can not measure a volume less than 100 ml . It can also measure volume in the integral multiple of 100 ml like 200 ml , 300 ml , 400 ml etc perfectly . All these have significant figure of one .
It can not measure volume like 150 , 250 , 255 , 760 etc because these measurements are not the integral multiple of 100 . 750 is not a integral multiple of 100 so it can not measure volume of 750 ml.
Answer:
Chemistry is the study of matter , its properties,how and why substance combine or separate to form other substance.
It's uses are
1) It is used in health care and beauty
2) Industries and transportation
3) Agriculture, science and technology
4) Cooking , cleaning, medicines etc
Answer : The mass of vanadium(V) oxide will be 
Explanation : Given,
Number of atoms of 
= 
Molar mass of = 181.88 g/mole
In , there are 2 atoms of vanadium and 5 atoms of oxygen.
First we have to determine the moles of .
As, 
number of vanadium atom present in 1 moles of
So, number of vanadium atom present in 
moles of
Now we have to determine the mass of .
Therefore, the mass of vanadium(V) oxide will be
Answer:
There are 342 g/ 95. 2 g/m = 3.59 moles
Explanation:
MgCl2 → Molar mass is 95.2g g/m
This is the mass in one mol so to find out the moles in 342g we have to divide the mass between the molar mass.
342 g/ 95. 2 g/m = 3.59 moles
