1) which of the following statement about hydrogen is incorrect? a) hydrogen ion,H3O+ exists freely in solution b) Dihydrogen acts as a reducing agent c) hydrogen has isotopes of which tritium is the most common d) hydrogen never act as cation in ionic salts 2) water gas is a) H2O b) CO+H2O c) CO+H2 d) CO+N2 3) Which one of the following statement is iincorrect with regard to ortho and paradi hydrogen? a) they are nuclear spin isomers b) Ortho isomer has zero nuclear spin whereas the para isomer has one nuclear spin c) the para isomer is favoured at low temperature d) the thermal conductivity of the para isomer is 50% greater than that of the Ortho isomer  4) Ionic hydrides are formed by a) Halogen b) chalogen c) inert gas d) group one elements 5) Tritium nucleus contains a) 1p+ 0n b) 2p+1n c) 1p+2n d) none of this  6) Non-stoichiometric hydrides are formed by a) Palladium,vanadium b) Carbon,nickel c) manganese ,lithium d) nitrogen, chlorine  7) Assertion: Permanent hardness of water is removed by treatment with washing soda.Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates a) Both assertion and reason are true and reason is the correct explanation of assertion. b) Both assertion and reason are true but reason is not the correct explanation ofassertion. c) Assertion is true but reason is false d) Both assertion and reason are false 8) If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen isreplaced with deuterium then the increase in body weight of the fish will be a) 1.2g b) 2.4g c) 3.6g d) 4.8g 9) The hardness of water can be determined by volumetrically using the reagent a) sodiumthiosulphate b) Potassium permanganate c) hydrogen peroxide d) EDTA 10) The cause of permanent hardness of water is due to a) Ca(HCO3)2 b) Mg(HCO3)2 c) CaCl2 d) MgCO3 11) Zeolite used to soften hardness of water is, hydrated a) Sodium aluminium silicate b) Calcium aluminium silicate c) Zinc aluminium borate d) Lithium aluminium hydride 12) A commercial sample of hydrogen peroxide marked as 100 volume H2O2 means that a) 1ml of H2O2 wil give 100 ml O2 at STP b) 1L of H2O2 will give 100ml O2 at STP c) 1L of H2O2 will give 22.4L O2 d) 1 ml of H2O2 will give 1 mole of O2 at STP 13) When hydrogen peroxide is shaken with an acidified solution of potassium dichromatein presence of ether, the ethereal layer turns blue due to the formation of  a) Cr2O3 b) CrO42- c) CrO(O^2)2 d) none of these  14) decolourisation of 1 mole of acidified KMnO4, the moles of H_{2}*O_{2} required is a) 1/2 b) 3/2 c) 5/2 d) 7/2 15) Volume strength of 1.5 N H2O2is a) 1.5 b) 4.5 c) 16.8 d) 8.4 16) hybridisation of oxygen atom is H2O and H2O2 are respectively a) sp and sp3 b) sp and sp c) sp and sp2 d) sp3 and sp3 17) the reaction H3PO2+D2O→H2DPO2+HDO indicates that hypo-phosphorus acid is a) tribasic acid b) dibasic acid c) Mono basic acid d) none of these  18) In solid ice, oxygen atom is surrounded a) tetrahedrally by 4 hydrogen atoms b) octahedrally by 2 oxygen and 4 hydrogen atoms c) tetrahedrally by 2 hydrogen and 2 oxygen atoms d) octahedrally by 6 hydrogen atoms 19) The type of H-bonding present in ortho nitro phenol and p-nitro phenol are respectively a) inter molecular H-bonding and intra molecular H-bonding b) intra molecular H-bonding and inter molecular H-bonding c) intra molecular H-bonding and no H-bonding d) intra molecular H-bonding and intra molecular H - bonding 20) Heavy water is used as a) modulator in nuclear reactions b) coolant in nuclear reactions c) both (a) and (b) d) None of this  21) water is a a) basic oxide b) acidic oxide c) amphoteric oxide d) None of these

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