Unit test- Revision 2
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15 questions
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- Q11. Which of the following statements about Dalton’s atomic theory are correct ? (i) Atoms are destructible and divisible . (ii)Atoms are indestructible ,indivisible and the smallest particle of an element. (iii)Atoms of the same element may not be alike . (iv)Atoms of the same element are alike in all respect.(iii) and (iv)(ii) and (iv)(i) and (iv)(i) and (ii)30s
- Q2In phosphoric acid ,the valency of phosphate radical is-2-3+3+130s
- Q3If two liquids have same boiling point and are completely soluble in each other. Which method would you use to separate them?Separating funnelChromatographyFractional distillationFiltration30s
- Q4Which of the following is true about a charged atom?anion has lost an electroncation is negatively chargedcation has gained an electronanion is negatively charged30s
- Q5Fractional distillation can be used to separate alcohol and water. This method of separation uses the fact that alcohol and watercontain different pigmentscontain different sized moleculesburn at different temperaturesboils at different temperatures30s
- Q6A few substances are arranged in the increasing order of their force of attraction between their particles. Which one of the following represents the correct arrangement ?oxygen,water,sugarwater,air,windsalt juice,airair,sugar,oil30s
- Q7Choose the correct statement from the following:conversion of solid state into liquid state is called sublimationconversion of solid state to liquid state on heating is called vapourisationconversion of liquid state to vapour state on heating is called liquefactionconversion of vapour state to liquid state on cooling is called liquefaction30s
- Q8An ideal method to separate water and chloroform isFractional distillationSeparating funnelSublimationDistillation30s
- Q9Variable valencies are used to indicate iongreater than -1greater than +1with more than 1 valency30s
- Q10Which one among the following most correctly determines the atomic number of an element?Number of protonsNumber of ionsNumber of protons and electronsNumber of nucleons30s
- Q11A radical with one atom of Sulphur and three atoms of oxygen isSulphiteSulphateBisulphite30s
- Q12A metal which is found in liquid state at room temperaturemercuryaluminiumpotassiumsodium30s
- Q13The most abundant element in the atmosphereoxygenargonnitrogen30s
- Q14Which of the following has minimum inter molecular space?LiquidsGasesSolids30s
- Q15Select the chemical formula of litharge from the following:NaOHPbOKOH30s