Title 02. ACIDS BASES and SALTS.pdf ✅

TO DOWNLOAD ORIGINAL VERSION OF PDF CONTACT: +919206306398 PER CLASS PDF COST JUST Rs: 500 Only 02. ACIDS,BASES and SALTS WORKSHEET 1 (1.) Oxygen has an oxidation state of +2 in the compound : (1) H O2 2 (2) CO2 (3) H O2 (4) FO2 (2.) Which of the following is not basic in nature? (1) Saliva (before meal) (2) Toothpaste (3) Saliva (after meal) (4) Tap water (3.) Phenolphthalein is a synthetic indicator and its color in acidic and basic Solutions, respectively are: (1) red and blue (2) blue and red (3) pink and colorless (4) colorless and pink (4.) Magnesium hydroxide is a common base which is used ______ (1) In soap manufacturing (2) As foaming agent in fire extinguishers (3) Antacid to treat stomach acidity (4) To remove grease stains (5.) The difference in number of water molecules in gypsum and plaster of paris is (1) 5 / 2 (2) 2 (3) 1 / 2 (4) 3 / 2 (6.) In the equilibrium – 3 3 2 CH COOH HF CH COOH F + + + (1) F – is the conjugate acid of CH3COOH (2) F – is the conjugate base of HF (3) CH3COOH is the conjugate acid of 3 2 CH COOH+ (4) CH3COOH2 + is the conjugate base of CH3COOH (7.) Ferrous sulphate on heating produces – (1) ferric oxide (2) sulphur dioxide (3) oxygen (4) water (8.) Name of the organic acid present in tomato is : (1) tartaric acid (2) malic acid (3) lactic acid (4) oxalic acid (9.) Which of the following statements is not correct? (1) A chemical equation tells us about the substances involved in a reaction (2) A chemical equation informs us about the symbols and formula of substances involved in a reaction (3) A chemical equation tells us about the atom or molecules of the reactants and products involved in a reaction (4) A chemical equation represents energy changes during a reaction (10.) Which species among the following, can act as an acid and a base is (1) HSO4 − (2) 2 4 SO − (3) H3O + (4) Cl– (11.) Which one of the following types of medicines is used for treatment indigestion– (1) Antibiotic (2) Analgesic (3) Antacid (4) Antiseptic (12.) Which of the following statement is true (1) The conjugate base of a strong acid is a strong base (2) The conjugate base of a weak acid is a strong base
TO DOWNLOAD ORIGINAL VERSION OF PDF CONTACT: +919206306398 PER CLASS PDF COST JUST Rs: 500 Only (3) The conjugate base of a weak acid is a weak base (4) The base and its conjugate acid react to form a neutral solution (13.) Which of the following is weakly acidic? (1) 0.1MHCl (2) 0.1MNaCl (3) 0.1M HC H O 2 3 2 (4) 0.1M CH OH 3 (E) 0.1KOH (14.) According to Bronsted law, water is a/an (1) Base (2) Acid (3) Acid and base both (4) Salt (15.) Baking soda is used as as it is (1) an antacid, a base (2) disinfectant, anti-germs (3) oxidising agent, a bleach (4) a soap, a base (16.) The number of molecules of water of crystallization present in one molecule of ferrous sulfate is (1) 5 (2) 7 (3) 6 (4) 10 (17.) ( )( ) ( ) ( ) ( ) ( ) 2 3 1 4 2 2 3 2 2 2 2 4 5 A A A A Cu H O OH Al H O Cu H O Al H O O H + + + +              + → +     (1) A1 is an acid and A2 is a base (2) A1 is a base and A2 is an acid (3) A3 is conjugate acid of A1 and A4 is conjugate base of A2 (4) A3 is conjugate base of A1 and A4 is conjugate acid of A2 Oxidation number is defined as the charge which an atom of the element has in its ion or appears to have when present in the combined state with other atoms There are certain rules for assigning oxidation number. Some of these rules are given below. • The oxidation number of all the atoms of different elements in their respective elementary states and allotropic forms is taken to be zero. • The O.N. of a monoatomic ion is the same as the charge on it. • The O.N. of hydrogen is +1 when combined with non-metals and is –1 when combined with active metals called metal hydrides • The O.N. of alkali metals (Li, Na, K, etc.) is always 1 and that of alkaline earth metals (Be, Mg, Ca, etc.) is • The algebraic sum of the O.N. of all the atoms in a compound must be zero. In polyatomic ion, the algebraic sum of all the O.N.’s of atoms of the ion must equal the charge on the ion. (18.) What is the correct increasing order of oxidation state of nitrogen in following compounds : NH , N , NH OH, NO 3 2 2 2 (1) NH NO N NH OH 3 2 2 2    (2) NO NH NH OH NH 2 3 2 3    (3) NH NH OH NO N 3 2 2 2    (4) NH NH OH N NO 3 2 2 2    (19.) Hydrogen sulphide ( H S2 ) is a strong reducing agent. Which of the following reactions shows its reducing action – (1) Cd(NO ) H S CdS 2HNO 3 2 2 3 + → + (2) CuSO H S CuS H SO 4 2 2 4 + → + (3) 3 2 2 2FeC1 H S 2FeC1 2HC1 S + → + + (4) Pb(NO ) H S PbS 2CH COOH 3 2 2 3 + → + (20.) Baking soda is not used: (1) in baking. (2) as an ingredient in antacids. (3) in fire- extinguishers. (4) as a disinfectant.