Important Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? क्या हमारे आस-पास के पदार्थ शुद्ध हैं?
Question 1:
A solution contains 80g of sugar in 320g of water. Find out the concentration of the mass by mass percentage of sugar solution that is formed.
एक विलयन में 320 ग्राम पानी में 80 ग्राम चीनी है। बनने वाले विलयन के द्रव्यमान प्रतिशत द्वारा द्रव्यमान की सान्द्रता ज्ञात करिए।
Important Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? क्या हमारे आस-पास के पदार्थ शुद्ध हैं?
Question 2:
Classify the following as homogeneous or heterogeneous mixtures.
Air, soil, soda water, shaving cream, tincture of iodine, milk
निम्नलिखित को समांगी या विषमांगी मिश्रण के रूप में वर्गीकृत करिए –
वायु, मृदा, सोडा जल, शेविंग क्रीम, टिंचर आयोडीन, दूध
Important Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? क्या हमारे आस-पास के पदार्थ शुद्ध हैं?
Question 3:
Classify the following into elements, compounds and mixtures.
Silicon, carbon dioxide, blood, sugar, copper, salt solution
निम्नलिखित को तत्वों, यौगिकों और मिश्रणों में वर्गीकृत करिए –
सिलिकॉन, कार्बन डाइऑक्साइड, रक्त, चीनी, तांबा, नमक का घोल
Question 4:
Classify the following as mixture and compound: (2)
(a) Iron and sulphur react to form Iron sulphide.
(b) Salt is dissolve in water.
Question 5:
State the properties of colloidal solution.
कोलाइडल विलयन के गुणधर्म बताइए।
Question 6:
Write the properties of a suspension.
Important Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? क्या हमारे आस-पास के पदार्थ शुद्ध हैं?
Question 7:
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Question 8:
Hydrogen is a combustible gas and Oxygen is a supporter of combustion. Water contains both Hydrogen and Oxygen but it is used to extinguish fire. Explain.
Question 9:
Differentiate between elements and compounds. Write any 3 points.
