Advertisements
Advertisements
प्रश्न
What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?
Advertisements
उत्तर
Pure gold is highly malleable and soft. When it is alloyed with copper or silver it becomes hard and strong and can be moulded into various shapes.
APPEARS IN
संबंधित प्रश्न
Solve the following problem:
Write the following number in ordinary decimal form:
3.75 × 10−1
Solve the following problem:
Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:
12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.
State which of the measurements you would accept, giving the reason.
A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig.2.3. The filter paper was removed when the water moved near the top of the filter paper.
(i) What would you expect to see, if the ink contains three different coloured components?
(ii) Name the technique used by the child.
(iii) Suggest one more application of this technique.
Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?
If the concentration of glucose \[\ce{(C6H12O6)}\] in blood is 0.9 g L–1, what will be the molarity of glucose in blood?
What is the difference between molality and molarity?
The molarity of pure water is ______.
With increase of temperature, which of these changes?
The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g or water is ______.
Molarity of liquid HCl will be if the density of the solution is 1.17 g/cc.
