A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Atoms of an element differ from those of all other elements in :
A. atomic number and electronic configuration
B. atomic number and number of valance electrons
C. number of neutrons and electronic configuration
D. number of neutrons and number of valence electrons
2. When 'Y' is boiled with aqueous alkali forms Z.Z answers the iodoform test. The compound 'A' is
A. methoxyethane
B. ethoxyethane
C. Propan -1 -o1
D. Propan -2 -o1
3. Of the following substances, the one that cannot be used as an insecticide is
A. DDT
B. malathion
C. gammexane
D. bleaching powder
4. It is expected to behave as
A. a central metal in a coordination compound
B. a reducing agent
C. an oxidising agent
D. a chelating agent
5. The colour of sky is due to
A. wavelength of scattered light
B. absorption of light by atmospheric gases
C. transmission of light
D. All of these
6. A saturated solution at a particular temperature
A. is colourless
B. is highly coloured
C. does not dissolve any more of the solid solute
D. contains suspended solid particles
7. Detergents produce lather with hard water because
A. they are soluble in hard water
B. they are colourless substances
C. the calcium and magnesium salts of sulphonic acids are soluble in water
D. they form sodium carbonate with hard water
8. The number of nodal planes present in s * s antibonding orbitals is
A. 2
B. 3
C. 0
D. 1
9. 2 g of organic compound on Kjeldahilization liberates ammonia which consumes 30 cm3 of 1 N HCl. The percentage of nitrogen in the organic compound is
A. 30
B. 46.67
C. 35
D. 20.8
10. Glass is made of the mixture of :
A. quartz and mica
B. sand and salt
C. sand and silicates
D. none of these
11. Artificially, gasoline is prepared by an industrial process known as
A. Sabatier and Sendren's process
B. Friedel-Crafts reaction
C. Fischer-Tropsch process
D. l-laber's' process
12. Chlorination' is
A. a process of converting chlorides into chlorine
B. adding small amounts of chlorine to contaminated water
C. a chemical reaction in which chlorine is formed
D. the formation of a salt containing chlorine
13. When carbon monoxide is passed over solid caustic soda heated to 200°C, it forms
A. Na2CO3
B. CH3COONa
C. HCOONa
D. NaHCO3
14. Camphor can easily be purified by the process of
A. sublimation
B. distillation
C. crystallisation
D. sedimentation
15. The reagent used in Clemmenson's reduction is
A. Zn-Hg / con. HCl
B. aq. K0H
C. Con H2SO4
D. al KOH
16. An element with atomic number 21 is a
A. transition element
B. halogen
C. alkali metal
D. representative element
17. Which of the following has the maximum number of unpaired 'd' electrons?
A. Zn2+
B. Ni3+
C. Fe2+
D. Cu+
18. The industrial preparation of the metal aluminium from bauxite involves the process of
A. fractional crystallisation
B. fractional distillation
C. electrolysis
D. reduction
19. When compared to DG0 for the formation of Al2O3 , the AG0 for the formation of Cr2O3 is
A. unpredicted
B. same
C. lower
D. higher
20. The original compound is
A. tertiary alcohol
B. primary alcohol
C. carboxylic acid
D. secondary alcohol
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