NCERT (Chemistry) Class-IX
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| ChemistryDate Added: 2022-05-21 Which of the following is/are the characteristics of matter? 1. Particles of matter have space between them. 2. Particles of matter are stationary. 3. Particles of matter attract each other. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for effect of temperature? 1. The kinetic energy of the particles increases. 2. The energy supplied by heat overcomes the forces of attraction between the particles. 3. The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its boiling point. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct about latent heat? 1. The word latent means hidden. 2. The amount of heat energy that is required to change 1 kg of a liquid into gas. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Sublimation-------change from solid to gas. 2. Deposition----------direct change of gas to solid. 3. Pressure and reducing temperature------ solidify gases. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for evaporation? 1. Change of a liquid into vapours at any temperature below its boiling point. 2. Increase in temperature decreases evaporation. 3. Decrease in humidity increases evaporation. | ||
| ChemistryDate Added: 2022-05-21 What is the correct order of force of attraction? | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for mixtures? 1. Mixtures are constituted by more than one kind of pure form of matter. 2. Alloys are mixtures of two or more metals or a metal and a non-metal and cannot be separated into their components by physical methods. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for solutions? 1. A solution is a heterogeneous mixture of two or more substances. 2. It can be solid solutions (alloys) and gaseous solutions (air). | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Solvent---------dissolves the substance. 2. Solute---------component that is dissolved 3. Tincture of iodine----------solution of iodine in water. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are characteristics of colloid? 1. A colloid is a heterogeneous mixture. 2. Colloids are big enough to scatter a beam of light. 3. The particles of a colloids can be seen by the naked eye. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Dispersed phase------dispersed particles 2. Dispersion medium----------dispersed phase is suspended 3. Aerosol-------fog | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Coloured dye from black ink------------evaporation. 2. Cream from milk------------filtration. 3. Oil and water----------separating funnel. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct about elements? 1. Elements can be normally divided into metals, non-metals and metalloids. 2. Antoine Laurent Lavoisie was the first scientist to use the term 'element' in 1661. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for compounds? 1. It is a substance composed of two or more elements. 2. The composition of each new substance is always fixed. 3. It shows the properties of the constituent substances. Which of the above statements are correct? | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are true for Dalton atomic theory? 1. All matter is made up of very tiny particles called atoms. 2. Atoms do not participate in chemical reactions. 3. Atoms are indivisible particles. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for law of constant proportion? 1. It was given and stated by Lavoisier. 2. In a chemical substance the elements are always present in definite proportions by mass. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for atomic mass? 1. It was proposed by Bohr. 2. It was explained by law of constant proportions. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for molecules? 1. It is a group of two or more atoms that are chemically bonded together. 2. Atoms of only the same element join to form molecules. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Argon- monoatomic 2. Phosphorus- poly atomic 3. Chlorine-diatomic | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for ions? 1. The charged species are known as ions. 2. A negatively charged ion is called an cation 3. A group of atoms carrying a charge is known as a polyatomic ion. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Electron------ J.J Thomson 2. Proton- --- Dalton. 3. Neutron-----James Chadwick | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for Thomson model of an atom? 1. An atom consists of a positively charged sphere and the electrons are embedded in it. 2. The negative and positive charges are unequal in magnitude. So, the atom as a whole is electrically neutral. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for observation of Rutherford experiment? 1. Most of the fast moving a-particles pass straight through the gold foil. 2. Some of the a-particles are deflected by the foil by small angles. 3. Surprisingly one out of every 1200 particles appear to rebound. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are true for electron distribution in shells? 1. It was suggested by Bohr. 2. The maximum number of electrons that can be accommodated in the outermost orbit is 8. 3. The maximum number of electrons present in a shell is given by the formula 2n(square). | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched?
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| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Mass number---denoted by M 2. Atomic number ------denoted by z 3. Isotopes---------same atomic number 4. Isobar----------same atomic mass | ||