Description : Phosphine is prepared by the action of
Last Answer : Phosphine is prepared by the action of A. `P and HNO_(3)` B. `P and H_(2)SO_(4)` C. `P and NaOH` D. `P and H_(2)S`
Description : What is phosphine ?
Last Answer : Phosphine is the hydride of phosphorus , signaled PH3.
Description : Which of the following is/are incorrect statements(s) for phosphine ?
Last Answer : Which of the following is/are incorrect statements(s) for phosphine ? A. It is less basic then ` ... burns in air forming predominantly `H_(3)PO_(4)`
Description : Phosphine is not obtained by the reaction
Last Answer : Phosphine is not obtained by the reaction A. White P is heated with NaOH B. Red P is ... D. Phosphorus trioxide is boiled with water under pressure
Description : Which of the following is used for refrigeration? (1) Sulphur dioxide (2) Chlorine (3) Freon (4) Phosphine
Last Answer : (3) Freon Explanation: Common refrigerants used in domestic refrigerators are Freon, neon and nitrogen. It flows through four components of refrigerator again and again.
Description : Give reasons i) H2O is a liquid but H2S a gas. ii) Ammonia has higher boiling point than phosphine ii) Krypton & xenon make compounds.
Last Answer : Ans: i) Hydrogen bond is found in H2O but not in H2S. ii) Hydrogen bond is found in NH3 but not in PH3. iii) Because they have low ionization energy.
Description : Why is phosphine weaker base than Ammonia?
Last Answer : Ans: P is bigger than N, therefore lone pair of electrons are less available on P than N.
Description : Both white phosphorous as well as red phosphorous (A) Are soluble in CS2 (B) Burns when heated in air (C) Reacts with hot caustic soda solution to give Phosphine (D) All (A), (B), and (C)
Last Answer : (B) Burns when heated in air
Last Answer : Freon
Description : Assertion :- A sol of `As_(2)S_(3)` prepared by the action of `H_(2)S` on `As_(2)O_(3)` is negatively charge. Reason :- Due to adsorption of `S^(-2)`
Last Answer : Assertion :- A sol of `As_(2)S_(3)` prepared by the action of `H_(2)S` on `As_(2)O_(3) ... Reason is False. D. If both Assertion & Reason are False.
Description : In the laboratory `H_(2)S` is prepared by the action of
Last Answer : In the laboratory `H_(2)S` is prepared by the action of A. Dil HCl on FeS B. Dil `H_(2)SO_(4) ` on ` ... )` C. water on `Al_(2)S_(3)` D. Water on FeS
Description : Pick out the wrong statement. (A) Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action (B) Soap powder is ... ., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc
Last Answer : (D) Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc