NCERT (Chemistry) Class-X
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| ChemistryDate Added: 2022-05-21 Which of the following is the observations of the chemical reaction? 1. Change in state 2. Evolution of a gas 3. Change in colour 4. Change in temperature | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Reactant-----substance which undergoes change 2. Product------new substance 3. Chemical reaction---simplest form | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for a balanced chemical equation? 1. It is based on law of conservation of mass. 2. The physical states makes the chemical reaction less informative. | ||
| 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. Combination reaction----------formation of single product. 2. Decomposition reaction----------break down of single, entity 3. Thermal decomposition------------heat is used. 4. Displacement reaction------------based on reactivity series. | ||
| ChemistryDate Added: 2022-05-21 Which of the statements about the reaction below are correct? 2PbO(s) + C(s) → 2Pb(s) + CO2(g) 1. Lead is getting reduced. 2. Carbon dioxide is getting oxidised. 3. Carbon is getting oxidised. 4. Lead oxide is getting reduced. | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is/are correct for litmus? 1. Litmus solution is a purple dye. 2. It is extracted from lichen. 3. In neutral solution, it remains colourless. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for olfactory indicators? 1. Their colour changes with acid or base. 2. Onion, vanilla or clove are examples. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Acid + salt-------metal+ hydrogen 2. Acid+ metal carbonate-------salt+carbon dioxide+ water 3. Metal oxide+acid----------salt + water | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for diluting acid? 1. Adding acid to water by stirring. 2. Adding water to acid by stirring. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for pH? 1. A scale for measuring hydronium ion concentration. 2. Values less than 7 on the pH scale represent an acidic solution. 3. As the pH value increases from 7 to 14, it represents an increase in hydrogen ion concentration in the solution. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Plants and animals----------pH range is 7.0 to 7.8 2. Rain water-------------pH is 7.6 3. Tooth decay----------pH less than 5.5 | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Common salt--------formed by sodium hydroxide and hydrochloric acid. 2. Brine----aqueous solution of sodium chloride 3. Chlor-alkali process-------formation of sodium chloride | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Bleaching powder---------oxidising agent in chemical industries 2. Baking powder-------------a mixture of sodium hydrogen carbonate and a mild edible acid 3. Washing soda-------remove permanent hardness of water | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Ductility----------------drawn into wire 2. Malleability------------drawn into sheets 3. Good conductors---------copper and mercury 4. Non-metals---------------solids or gases | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Mercury--------liquid at room temperature 2. Iodine-----------non-lustrous 3. Lithium---------low melting point 4. Graphite--------good conductor | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is/are correct for metals? 1. They react with oxygen to form metal oxides. 2. All metallic oxides are basic in nature. 3. Metals are reducing agents. | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is/are correct for anodising? 1. It is a process of forming a thick oxide layer of aluminium. 2. The aluminium oxide coat makes it resistant to further corrosion. 3. It is electrolysed with dilute hydrochloric acid. | ||
| ChemistryDate Added: 2022-05-21 Which of the following metals do/does not react with cold water? 1. Potassium 2. Sodium 3. Magnesium 4. Aluminium | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is/are correct for aqua regia? 1. It is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid. 2. Hydrochloric acid and nitric acid are in ratio 2:1 3. It can dissolve gold. | ||
| ChemistryDate Added: 2022-05-21 What is/are true for ionic compounds? 1. They are solids 2. They have low melting and boiling points. 3. They are soluble in water. 4. They are good conductors of electricity. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched for metals? 1. High reactivity---------------electrolysis of molten ore 2. Medium reactivity-----------roasting 3. High reactivity-----------------calcination | ||
| ChemistryDate Added: 2022-05-21 Which of the following is correct order of melting points? | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are the characteristic of carbon for the formation of large number of organic compounds? 1. Catenation 2. Tetravalency | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for allotropes of carbon? 1. They are two in number. 2. In diamond, each carbon atom is bonded to four other carbon atoms. 3. In graphite, each carbon atom is bonded to three other carbon atoms in the same plane giving a hexagonal array. | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is/are correct for saturated compounds? 1. They are called alkanes. 2. They are single bonded. 3. They are very reactive. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are correct for homologous series? 1. The melting point increases as we go down in a series. 2. It is a series with different functional groups. | ||
| ChemistryDate Added: 2022-05-21 Which of the following are correctly matched? 1. Alkaline potassium permanganate------reducing agent 2. Addition reaction-----------hydrogenation of vegetable oil 3. Concentrated sulphuric acid-------dehydrating agent. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is/are true for ethanol? 1. Ethanol is an important industrial solvent. 2. Dyes added to alcohol is called as denatured alcohol. 3. It can be used as a fuel. | ||
| ChemistryDate Added: 2022-05-21 Which of the following statement is/are correct for dobereiner triads? 1. It was given in the year 1816. 2. It was a group of three elements. 3. When the three elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements. | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is/are true for law of octaves. 1. It was applicable upto potassium. 2. Assumption was only 56 elements will exist. 3. It was given by John Newlands. | ||
| ChemistryDate Added: 2022-05-21 Which of the following is not based on atomic mass? 1. Dobereiner triads 2. Newland's law of octaves 3. Mendeleev classification 4. Modern periodic table Which of the above statements is correct? | ||
| ChemistryDate Added: 2022-05-21 Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table. | ||