Chemistry A level multiple choice Questions with Correct Answers Merged

1. which element is in the d-block of the periodic table? A- -Selenium B- -Antimony C- -Tantalum D- -Lead - Ans .C 2. There are 392mol of pure gold in a bar measuring 10cm by 109cm by 40cm. What is the denisty of the gold? A- -193 B- -19.3 C- -1.93 D- -0.193 - Ans .B 3. Which species contains an element with oxidation state of +4? A- -NO2+ B- -ClO3- C- -H2SO3 D- -PCl5 - Ans .C 4. Ions of 2 isotops of Iron are: 53Fe2+ and 56Fe2+ Which statement in correct? A- -The ions of both the isotopes have electronic configuration 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6. B- -The ions of both the isotopes contains 26 neutrons. C- -53Fe2+ has fewer protons than %6Fe2+ D- -After acceleration to the same kinetic energy 56Fe2+ will move more slowly than 53Fe2+. - Ans .D 5. Which of these decreases down group 2? A- -first ionisation energy B- -Atomic radius C- -number of protons D- -reactivity of water - Ans .A 6. K2Cr2O7 + 3H2C2O4 +_H2SO4 -> Cr2(SO4)3+_H2O + ^CO2+K2SO4 In the balanced equation the mole ratio for sulfuric acid to water is...? A- -1:4 B- -1:2 C- -4:7 D- -4:9 - Ans .C 7. K2Cr2O7 + 3H2C2O4 +_H2SO4 -> Cr2(SO4)3+_H2O + ^CO2+K2SO4 What is the reducing agent in this reaction? A- -H+ B- -C2O42- C- -K+ D- -Cr2O72- - Ans .B 8. Which substance exists as a macromolecule? A- -Cu B- -SiO2 C- -P4O10 D- -MgO - Ans .B 9. A pale brown mixture of NO2 and N2O4 is allowed to reach equilibrium in a sealed gas syringe according to the following equation. 2NO2(g) ⇌ N2O4(g) When the plunger is pushed further into the syringe the pressure increases and the mixture becomes paler in colour. When the syringe is placed in a hot oven the mixture becomes darker in colour. Which of the following statements is correct? A- -NO2 is brown and the forward reaction is exothermic. B- -NO2 is brown and the forward reaction is endothermic. C- -NO2 is colourless and the forward reaction is exothermic. D- -NO2 is colourless and the forward reaction is endothermic. - Ans .A 10. In which one of the following reactions is a heterogeneous catalyst not used? A- -N2 + 3H2 → 2NH3 B- -CO + NO → CO2 + 1/2N2 C- -CO2 + C → 2CO D- -SO2 + 1/2O2 → SO3 - Ans .C 11. Which one of the following can exhibit both geometrical and optical isomerism? A- -(CH3)2C=CHCH(CH3)CH2CH3 B- -CH3CH2CH=CHCH(CH3)CH2CH3 C- -(CH3)2C=C(CH2CH3)2 D- -CH3CH2CH(CH3)CH(CH3)C=CH2 - A