Metal and non metal

The electronic configuration of elements A, B, C and D are 6,8,10 and 12 respectively. The two elements which can react to form ionic compounds are

• A and D

• A and C

• B and D

• B and C

The elements whose oxides can turn phenolphthalein solution pink are

• Sodium and potassium

• Sodium and sulphur

• Potassium and Carbon

• Potassium and phosphorus

The elements whose oxides can turn red litmus solution blue are

• K and Mg

• C and S

• Na and C

• Mg and S

Which of the metals are refined by electrolytic refining

i) Ag ii) Cu iii) Na iv) K

• i and ii

• ii and iii

• i and iii

• ii and iv

In the experiment colour of copper sulphate changes to

• White

• Red

• Brown

• Pale green

Study the diagram given and identify the gas X formed in the reaction

• Carbon dioxide which extinguish burning candle

• Oxygen due to which candle burning more brightly

• Sulphur dioxide which produces a suffocating smell

• Hydrogen while burning candle produces a pop sound

Observe the diagram and reason out for the conduction of electricity in salt

solution not in sugar solution

• Salt water have free ions

• Salt water have static ions

• Salt water have static electrons

• Salt water have free electrons

Which option gives the process of extraction of mercury from its ore cinnabar?

• Cooling cinnabar in the absence of air

• Cinnabar it convert it into metal oxide then heating it again

• Cooling cinnabar converting it into metal oxide then heating it again

• Heating cinnabar in limited supply of air

A student adds an equal amount of copper sulphate solution in two beakers. He adds zinc in

beaker P and silver in beaker Q. The student observes that the color of the solution in beaker P

changes while no change is observed in beaker Q. Which option arranges the metals in

increasing order of reactivity?

• silver-zinc-copper

• zinc-copper- silver

• silver-copper-zinc

• copper-silver-zinc

The chemical reaction between a piece of copper and nitric acid is given by the chemical

equations,

Cu + HNO3 -> Cu(NO3)2 + H2

H2 + HNO3 -> H2O + NO2

What can be inferred from the chemical equation?

• Copper causes the oxidation of HNO3 to form NO2.

• Hydrogen gas gets oxidized by HNO3 to form water.

• Nitrate reacts with hydrogen to form NO2 and H2O.

• gas reacts with oxygen in the air to form water.