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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Ordinary starch stirred with cold water will result in a

Ordinary starch stirred with cold water will result in a suspension (c) because starch particles do not dissolve in cold water but remain dispersed as insoluble particles. This mixture is heterogeneous, and the starch eventually settles at the bottom over ...

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Kanta Jha

Asked: January 31, 2025In: Class 9 Social Science

Two chemical species X and Y combine together to form a product P which contains both X and Y X + Y → P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning the species X, Y and P correct? (i) P is a compound. (ii) X and Y are compounds. (iii) X and Y are elements. (iv) P has a fixed composition.

(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal

(c) Changes (i), (iii) and (iv) are physical in nature because we can get back to the original form by physical methods. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Rusting 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.

(c) The name given to rusting of iron is corrosion and it involves a chemical change. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

A mixture is made up of (a) two or more elements. (b) two or more compounds. (c) both (a) and (b). (d) none of these.

(c). A mixture contains two elements or two compounds or an element and a compound. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which of the following is a true solution? (a) Vinegar solution (b) Blood (c) Milk (d) Muddy water

(a) Vinegar (acetic acid) dissolves in water to give a true solution. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

What is the major compound present in common salt? (a) MgCl₂ (b) NaCl (c) CaCl2 (d) KCl

(b) NaCl is the major compound present in common salt. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which of the following statements are correct for pure substances? (i) Pure substances contain only one kind of particles. (ii) Pure substances may be compounds or mixtures. (iii) Pure substances have the same composition throughout. (iv) Pure substances can be exemplified by all elements other than copper. (a) (i) and (ii) (b) (i) and (iii) (c) (iii) and (iv) (d) (ii) and (iii)

(b) Pure substances contain one type of particles and have the same composition throughout. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

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)

(c) Only the statement (ii) that the product will always have a fixed composition. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

A 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) Solids have the maximum force of attraction between particles followed by liquids followed by gases. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Ordinary starch stirred with cold water will result in a

Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal

Rusting 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.

A mixture is made up of (a) two or more elements. (b) two or more compounds. (c) both (a) and (b). (d) none of these.

Which of the following is a true solution? (a) Vinegar solution (b) Blood (c) Milk (d) Muddy water

What is the major compound present in common salt? (a) MgCl₂ (b) NaCl (c) CaCl2 (d) KCl

A 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

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