10th
- Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of a Correct option is d) displacement reaction. 2
- Which of the statements about the reaction below are incorrect? 2PbO (s) + C (s) → 2Pb (s) + CO2 (g) Correct option is (i) (a) and (b) 2
- Identify the substances that are oxidised and the substances that are reduced in the following (i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced. (ii) Copper oxide (CuO) is reduced to copper (Cu) while hydrogen (H₂... 1
- Give an example of a double displacement reaction other than the one given in Activity 1.10. Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride. Na₂CO₃+CaCl₂→ CaCO₃+2NaCl In this reaction, sod... 1
- Why does the colour of copper sulphate solution change when an iron nail is dipped in it? When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive t... 1
- Why is the amount of gas collected in one of the test tubes in Activity 1.7 double Water contains two parts of hydrogen and one part oxygen. Therefore, during the electrolysis of water the amount of hydrogen gas collected i... 1
- A solution of a substance ‘X’ is used for white washing. (i) The substance 'X' is calcium oxide. Its chemical formula is CaO. (ii) Calcium oxide reacts vigorously with water to form calcium hydroxi... 1
- Write the reaction of the substance ‘X’ named in (i) above with water. Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime). CaO (s) + H₂O (l) → Ca(OH)₂ (aq) Calcium Oxide (Quick Li... 2
- (i) Name the substance ‘X’ and write its formula. The substance 'X' is calcium oxide. Its chemical formula is CaO. 1
- Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) (ii) NaOH (aq) + HCl (aq) → NaCL (aq) + H₂O (l) 2
- Solutions of barium chloride and sodium sulphate in water react to give insoluble barium (i) BaCl₂ (aq) + Na₂SO₄ (aq) → BaSO₄ (s) + 2NaCl (aq) 2
- Write the balanced equation for the following chemical reactions. (i) H₂ (g) + Cl₂ (g) → 2HCl (g) (ii) 3BaCl₂ (s) + Al₂(SO₄)₃ (s) → 3BaSO₄ (s) + 2AlCl₃ (s) (iii) 2Na(s) + 2H₂O (l) → 2NaOH (aq) + H₂ (g) 1
- Why should a magnesium ribbon be cleaned before it is burnt in air? Magnesium is a very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magn... 1
- Computer Application solutions CBSE std 10th frankedu.com You can get all solutions on frankedu website Link-> https://www.frankedu.com/studentzonebook/1557119001-0llComputer%20Applications%20CBSE%2... 1
- Computer science sample question paper cbse pdf download Download Now 1
- Choose the correct option from the following to fill up in line 5: a. ul b. <\ul> c. <ul> d. </ul> Correct option is d.</ul> 1
- Choose the correct option from the following to fill up in line 4: a. <i> b. </li> c. <\li> d. <\i> Correct option is b.</li> 1
- Choose the correct option from the following to fill up in line 3: a. </f> b. <f> c. </font> d. <font> corret option is oprion c. </font> 1
- Choose the correct option from the following to fill up in line 2: a. font b. face c. type d. text Correct option is b. face 1
- Choose the correct option from the following to fill up in line 1: a. /hl b. /h6 c. \h6 d. /hl Correct option is d. /hl 1
- Choose the correct option from the following to fill up in line 1: a. /hl b. /h6 (i) d. /hl (ii) b. face (iii) c.</font> (iv) b.</li> (v) d.</ul> 1
- The computer teacher of Geetika’s class decides to take an online session on the topic Netiquettes, Correct option is d. All of the above. 2
- Geetika is advised by her best friend, Seerat to protect her personal information from intentional or Correct option is c. Data Privacy 2
- After hearing her ordeal, the school decides to publish a set of moral principles that determines d. Cyber Ethics 2