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Write balanced chemical equations for the following word equations: (a) Calcium hydroxide + Carbon dioxide rarr Calcium carbonate + Water (b) Phosphorus pentachloride + Water rarr Phosphoric acid + Hydrogen chloride (c ) Zinc + Silver nitrate rarr Zinc nitrate + Silver (d) Sodium + Water rarr Sodium hydroxide + Hydrogen (e) Aluminium + Copper chloride rarr Aluminium chloride + Copper

The call wall of algae is made up of :- (a) Cellulose (b) Galactans ( c ) CaCO_(3) (Calcium carbonate ) (d) Hemicellulose ( e ) Shberin (f) Mannans Choose correct combination:-

Classify the following into elements, compounds and mixtures. (a) Sodium (b) Soil (c ) Sugar solution (d) Silver (e ) Calcium carbonate (f) Tin (g) Silicon (h) Coal (i) Air (j) Soap (k) Methane (l) Carbon dioxide (m) Blood

Read the given passage and answer the questions. P, Q, R are different colourless solids, while S is a colourless solution. They are in random order) Sodium chloride (NaCl), Calcium Carbonate (CaCO_(3)) , Acetic acid (CH_(3)COOH) and Phenolphthalein indicator. Small amount of the above substances were added in pairs (e.g. P with Q, Q with R etc.) to a small amount of water in a test tube. They give the following results as shown in the observation table. Observation Table: The chemicals are:

Read the given passage and answer the questions. P, Q, R are different colourless solids, while S is a colourless solution. They are in random order) Sodium chloride (NaCl), Calcium Carbonate (CaCO_(3)) , Acetic acid (CH_(3)COOH) and Phenolphthalein indicator. Small amount of the above substances were added in pairs (e.g. P with Q, Q with R etc.) to a small amount of water in a test tube. They give the following results as shown in the observation table. Observation Table: Which of the following reaction is incorrect ?

Read the given passage and answer the questions. P, Q, R are different colourless solids, while S is a colourless solution. They are in random order) Sodium chloride (NaCl), Calcium Carbonate (CaCO_(3)) , Acetic acid (CH_(3)COOH) and Phenolphthalein indicator. Small amount of the above substances were added in pairs (e.g. P with Q, Q with R etc.) to a small amount of water in a test tube. They give the following results as shown in the observation table. Observation Table: If acetic acid and hydrochloric acid of same concentration are taken, HCl is a stronger acid because it contains:

Read the given passage and answer the questions. P, Q, R are different colourless solids, while S is a colourless solution. They are in random order) Sodium chloride (NaCl), Calcium Carbonate (CaCO_(3)) , Acetic acid (CH_(3)COOH) and Phenolphthalein indicator. Small amount of the above substances were added in pairs (e.g. P with Q, Q with R etc.) to a small amount of water in a test tube. They give the following results as shown in the observation table. Observation Table: The chemicals that can be used as an acid base indicator by a visually impaired student is _____ .

Write complete balanced reactions for the following : (a) Red phosphorous reacts with iodine in presence of water. (b) White phosphrous is boiled with a strong solution of NaOH in an inert atmosphere. ( c) Phosphorous reacts with conc. HNO_3 to give H_3PO_4 . (d) Iodine reacts with concentrated nitric acid. (e) Orthophosphoric acid is heated with nitric acid and ammonium molybdate. (f) Disodium hydrogen phosphate is added to ammonical solution of magnesium sulphate. (g) Magnesium is burnt in air and the product is treated with water. (h) Phosphine is passed through AgNO_3 solution. (i) A mixture of air and ammonia is passed over heated platinum gauze. (j) Gold is treated with aqua regia. (k) Water is added to calcium phosphide. (l) Calcium phosphate is heated with a mixture of sand and carbon. (m) Phosphorous reacts with nitric acid to give equimolar ratio of nitric oxide and nitrogen dioxide. (n) Zinc is treated the very dilute nitric acid. (o) Phosphine is treated with an acidified CuSO_4 solution.