MCQs Olympiad NSO Science

1. Ethene is produced when :
(a) Ethanol reacts with ethanoic acid in presence of few drops of conc. H2SO4
(b) Ethanol is oxidized with acidified potassium dichromate
(c) Ethanol is heated with excess of conc. H2SO4 at 443 K
(d) Ethanol reacts with sodium metal                                                                                                                     
Ans (c)
2.   Rasika mixed sugarcane juice with yeast and kept in covered and sealed pot for a few days. After opening the pot she noticed that the juice started giving a strong smell. She filtered the juice and filled it in bottles. What is the name of the process and what is the product formed ?
(a) Fermentation, Ethyl alcohol                                                 
(b) Decomposition, Glucose
(c) Esterification, Fructose                                                          
(d) Fermentation, Acetic acid                    
Ans (a)
3.   The portion left after removing a hydrogen atom from an alkane is called :
(a) Functional group                                                                      
(b) Alkenyl group
(c) Alkyl group                                                                                  
(d) Phenyl group                                             
Ans (b)
4.   The compound which gives brisk effervescene with sodium metal but not with sodium hydrogen carbonate is :
(a) Ethanol                                                                                         
(b) Ethanoic acid
(c) Both (a) & (b)                                                                             
(d) None of these                                           
Ans (a)
5.   Mark the wrong statement among the following.
(a) People sleeping in closed room with coal fire burning inside have died due to CO2 poisoning.
(b) Flame is only produced when gaseous substances burn.
(c) Fullerenes are allotropes of carbon.
(d) Intake of methyl alcohol can cause death.                                                                                                    
Ans (a)
6. Elements which lie in the same ______ have similar ______ and same number of ______ and the elements are arranged in the increasing order of number of _______.
(a) Period, Valence electrons, Shells, Electrons
(b) Group, Electronic configuration, Valence electrons, Shells
(c) Group, Shells, Electrons, Valence electrons
(d) Period, Properties, Electrons, Shells                                                                                                                
Ans (b)
7.   An element X has electronic configuration 2, 8, 2. It forms ionic compounds with ions like nitrate, sulphate and phosphate. What will be the formulae of these compounds ?
(a) X2NO3, X2SO4, X2(PO4)3                                          
(b) X2NO3, XSO4, X3PO4
(c) XNO3, XSO4, XPO4                                                     
(d) X(NO3)2, XSO4, X3(PO4)2                                        
Ans (d)
8.   Which of the following elements will form an acidic oxide ?
(a) An element with atomic number                      
(b) An element with atomic number 3
(c) An element with atomic number 12                 
(d) An element with atomic number 19                
Ans (a)
9.   Which of the following properties generally shows a decreasing trend along a period ?
(a) Atomic size                                                                 
(b) Electron affinity
(c) Ionisation energy                                                     
(d) Electronegativity                                                      
Ans (a)
10.   The oxide of which of the following elements is not acidic ?
(a) Cl                                                                                     
(b) S
(c) N                                                                                     
(d) Li                                                                                     
Ans (d)
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