A. magnessium ribbon does not burn.
B. magnessium oxide is obtained as ash.
C. magnessium ribbon burns without any flame like charcoal.
D. magnesium di oxide is obtained as solid residue
A. Hold the test tube with a test tube holder.
B. point the mouth of the test tube away from yourself.
C. brown fumes of nitrogen di oxide are formed.
D. Oxygen gas is produced.
A. Zinc, Zinc
B. Zinc, Silver nitrate
C. Silver nitrate, Silver nitrate
D. Silver, Zinc nitrate
A. neutral colour of litmus solution is purple and not green
B. cloth soaked in turmeric solution, is a colour indicator.
C. cloth soaked in chopped onion and then rinsed with water is a colour indicator.
D. vanilla essence is an olfactory indicator
A. Nothing happens
B. Colour of the solution in testube changes to green, while nothing happens in soap solution.
C. effervesence are seen in the test tube, while colour of soap solution changes to RED indicating the gas evolved is acidic.
D. effervescence is observed in test tube, soap bubbles are seen escaping out of soap solution.
A. A beaker full of vinegar
B. human blood
C. milk of magnesia
D. HCl solution made with a beaker full of distilled water. and 5 ml concentrated HCl.
A. It is called so due to evolution of chlorine, and production of an alkali.
B. It is electrolysis of brine.
C. hydrogen gas is liberated at Anode, and chlorine gas is liberated at cathode.
D. The alkali produced can be used in artificial fibres.
A. It is a hard substance used in plastering bones,which when heated to 373 K, produces gypsum.
B. It is a kind of hydrated sulphate salt of lime.
C. In its hydrated form, two molecules of calcium sulphate share 1 molecule of water of crystallisation.
D. It was earlier prepared from natural sources in Paris (France), and extensively used for plastering works. Hence, the name "Plaster of Paris".
A. Sodium and Potassium have very low melting point, hence they are stored under kerosene.
B. Gallium and Caesium have very low melting point, they would melt even if kept on palm.
C. Iodine is a lustrous metal.
D. All of the above
A. Both statements are true
B. Both statements are true, and Statement 2 is the correct explanation of Statement 1.
C. Only statement 1 is true
D. Only statement 2 is true
A. Calcium immediately starts floating and catches fire like sodium.
B. Calcium remains sunk and there is production of effervescence.
C. There is no reaction, unless water is heated.
D. Calcium immediately starts floating.
A. C, A
B. B, A
C. C, E
D. B, D
A. Only Statement 1 is correct.
B. Only statement 2 is correct.
C. Both Statements are correct.
D. Both statements are correct and Statement 2 is the correct explanation of statement 1.
A. Add drop by drop water to acid
B. Add drop by drop acid to water
C. Constantly stir the mixture
D. Place the mixture on ice pack
1. b, 2. b, 3. c, 4. c, 5. d, 6. a, 7. c,
8. a, 9. b, 10. a, 11. d, 12. b, 13. d, 14. b
