Q. According to Mendeleev's periodic table, what was the atomic mass of Eka-aluminium which was later replaced by Gallium?
1) 95
2) 83
3) 68
4) 50
Q. In 1955, which synthetic element is provisionally named Mendeleev, who created one of the first periodic tables?
1) Element 90
2) Element 101
3) Element 103
4) Element 106
Q. Consider the following statements regarding the burning of magnesium ribbon in the air -
1. The white powder of MgO is formed.
2. It is an example of a combustion reaction.
3. Heat and light are produced.
Which of the statements given above is correct?
1) Only 1 and 2
2) Only 1 and 3
3) Only 2 and 3
4) All 1, 2 and 3
Q. Which of the following statements with regard to heating lead nitrate powder over a flame is correct?
1. Brown fumes of NO are released.
2. Colourless O2 gas is released.
3. It is an example of an oxidation reaction.
4. It is an example of thermal decomposition used for the production of NO2 gas.
Select the correct answer using the code given below -
1) 1 and 2
2) 2, 3 and 4
3) 1, 3 and 4
4) Only 2 and 4
Q. Which one of the following is not an oxidation reaction?
1) Rusting of iron
2) Opening of soda bottle
3) Rancidity
4) Combustion
Q. The hydrogen bomb and the uranium bomb are based, respectively on -
1) nuclear fusion and fission
2) fission and thermonuclear fusion
3) geothermal fission and fusion
4) geothermal fusion and fission
Q. What is the chemical composition of a soda-acid type fire extinguisher?
1) Solution of sodium hydrogen carbonate and sulfuric acid
2) Solution of sodium carbonate and sulfuric acid
3) Solution of carbon dioxide and sulfuric acid
4) Solution of sodium chloride and sulfuric acid
Q. Consider the following statements -
While diluting concentrated nitric acid solution
(1) the concentration of (H3O+) ions/volume increases
(2) water must be added slowly to concentrated acid
(3) acid must be added slowly to water
Which of the statements given above is/are correct?
1) All 1, 2, and 3
2) Only 1 and 2
3) Only 3
4) Only 2 and 3
Q. Which one of the following is the correct order of pH for the given substances?
1) Coffee < Lemon juice < Milk of magnesia < Blood
2) Milk of magnesia < Blood < Coffee < Lemon juice
3) Lemon juice < Blood < Coffee < Milk of magnesia
4) Lemon juice < Coffee < Blood < Milk of magnesia
Q. Which one of the following is not true for an anodizing process?
1) It makes aluminium corrosion resistant.
2) Metals like aluminium, titanium and magnesium can be anodized.
3) Clean aluminium article is the anode and oxygen gas is evolved at the cathode.
4) It is used in aircraft industry.