The correct answer is: (c) (i), (iii), and (iv) (i) Incorrect – The product A₂B is a new substance with different properties from A and B. (ii) Correct – Compounds always have a fixed composition. (iii) Incorrect – A₂B is a compound because it is formed by the chemical combination of A and B. (iv) IRead more
The correct answer is: (c) (i), (iii), and (iv)
(i) Incorrect – The product A₂B is a new substance with different properties from A and B.
(ii) Correct – Compounds always have a fixed composition.
(iii) Incorrect – A₂B is a compound because it is formed by the chemical combination of A and B.
(iv) Incorrect – A compound is different from an element; A₂B is not an element.
(c) Oxygen, water, sugar In matter, the force of attraction between particles increases from gases to liquids to solids. Oxygen (gas) has the weakest forces, water (liquid) has moderate forces, and sugar (solid) has the strongest intermolecular forces. https://www.tiwariacademy.com/ncert-solutions/cRead more
(c) Oxygen, water, sugar
In matter, the force of attraction between particles increases from gases to liquids to solids. Oxygen (gas) has the weakest forces, water (liquid) has moderate forces, and sugar (solid) has the strongest intermolecular forces.
(c) 308 K, 329 K, 391 K. To convert Celsius to Kelvin: K = °C + 273 Diethyl ether: 35°C + 273 = 308 K Acetone: 56°C + 273 = 329 K n-Butyl alcohol: 118°C + 273 = 391 K https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(c) 308 K, 329 K, 391 K.
To convert Celsius to Kelvin:
K = °C + 273
Diethyl ether: 35°C + 273 = 308 K
Acetone: 56°C + 273 = 329 K
n-Butyl alcohol: 118°C + 273 = 391 K
The correct answer is: (c) Corrosion and it is a chemical change. Rusting occurs when iron reacts with oxygen and moisture, forming iron oxide (rust). This process alters the chemical composition of iron, making it a chemical change rather than a physical one. https://www.tiwariacademy.com/ncert-solRead more
The correct answer is: (c) Corrosion and it is a chemical change. Rusting occurs when iron reacts with oxygen and moisture, forming iron oxide (rust). This process alters the chemical composition of iron, making it a chemical change rather than a physical one.
(b) Germanium, because it has both type of characteristics like metal and non-metal. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
(b) Germanium, because it has both type of characteristics like metal and non-metal.
Two substances A and B were made to react to form a third substance A₂B according to the following reaction: 2A + B → A₂B Which of the following statements concerning this reaction are incorrect? (i) The product A₂B shows the properties of the substances A and B. (ii) The product will always have a fixed composition. (iii) The product so formed cannot be classified as a compound. (iv) The product so formed is an element. (a) (i), (ii) and (iii) (b) (i), (ii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv)
The correct answer is: (c) (i), (iii), and (iv) (i) Incorrect – The product A₂B is a new substance with different properties from A and B. (ii) Correct – Compounds always have a fixed composition. (iii) Incorrect – A₂B is a compound because it is formed by the chemical combination of A and B. (iv) IRead more
The correct answer is: (c) (i), (iii), and (iv)
(i) Incorrect – The product A₂B is a new substance with different properties from A and B.
(ii) Correct – Compounds always have a fixed composition.
(iii) Incorrect – A₂B is a compound because it is formed by the chemical combination of A and B.
(iv) Incorrect – A compound is different from an element; A₂B is not an element.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See lessA few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement ? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air
(c) Oxygen, water, sugar In matter, the force of attraction between particles increases from gases to liquids to solids. Oxygen (gas) has the weakest forces, water (liquid) has moderate forces, and sugar (solid) has the strongest intermolecular forces. https://www.tiwariacademy.com/ncert-solutions/cRead more
(c) Oxygen, water, sugar
In matter, the force of attraction between particles increases from gases to liquids to solids. Oxygen (gas) has the weakest forces, water (liquid) has moderate forces, and sugar (solid) has the strongest intermolecular forces.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessThe boiling points of diethyl ether, acetone and n-butyl alcohol are 35 °C, 56 °C and 118 °C respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 Κ, 391 Κ (d) 329 K, 392 Κ, 308 K
(c) 308 K, 329 K, 391 K. To convert Celsius to Kelvin: K = °C + 273 Diethyl ether: 35°C + 273 = 308 K Acetone: 56°C + 273 = 329 K n-Butyl alcohol: 118°C + 273 = 391 K https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(c) 308 K, 329 K, 391 K.
To convert Celsius to Kelvin:
K = °C + 273
Diethyl ether: 35°C + 273 = 308 K
Acetone: 56°C + 273 = 329 K
n-Butyl alcohol: 118°C + 273 = 391 K
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessRusting of an article made up of iron is called (a) corrosion and it is a physical as well as chemical change. (b) dissolution and it is a physical change. (c) corrosion and it is a chemical change. (d) dissolution and it is a chemical change.
The correct answer is: (c) Corrosion and it is a chemical change. Rusting occurs when iron reacts with oxygen and moisture, forming iron oxide (rust). This process alters the chemical composition of iron, making it a chemical change rather than a physical one. https://www.tiwariacademy.com/ncert-solRead more
The correct answer is: (c) Corrosion and it is a chemical change. Rusting occurs when iron reacts with oxygen and moisture, forming iron oxide (rust). This process alters the chemical composition of iron, making it a chemical change rather than a physical one.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See lessOut of these, which one is metalloid?
(b) Germanium, because it has both type of characteristics like metal and non-metal. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
(b) Germanium, because it has both type of characteristics like metal and non-metal.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See less