GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 048

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 048

471). The number of ions produced from one molecule of K4Fe(CN)6 in aqueous solution is
A). 4
B). 3
C). 5
D). 1

Answer: 4


  
472). The formula which is used to calculate the maximum number of electrons in the principle quantum number is
A). n2
B). 2n2
C). 3n
D). 4n

Answer: 2n2



  
473). Trimethyl benzene is called
A). pyrogallol
B). catechol
C). mesityl oxide
D). mesitylene

Answer: mesitylene

  
474). The formula of plaster of paris is
A). CaSO4
B). CaSO4.H2O
C). CaSO4.1/2 H2O
D). CaSO4.2H2O

Answer: CaSO4.1/2 H2O



  
475). A white powder insoluble in water dissolves in ammonium hydroxide. It could be
A). silver chloride
B). aluminium oxide
C). calcium carbonate
D). barium sulphate

Answer: silver chloride



476). Mass number of an element represents
A). number of protons and neutrons
B). number of electrons and neutrons
C). number of protons and electrons
D). none of these .

Answer: number of protons and neutrons


  
477). Match the following correctly and select the answer using the codes given below:
Molecule                           Shape
a) Ammonia                     1) Linear
b) Water                         2) Planar
c) Boran trifluorlde            3) V-shaped
d) Carbon-di-oxide            4) Pyramid

Codes:
a b c d
A). 3 2 1 4
B). 3 1 4 2
C). 4 3 2 1
D). 1 2 3 4

Answer: 4 3 2 1


  
478). The commonly used refrigerant in fridges is
A). ammonia
B). liquid nitrogen
C). liquid oxygen
D). freons

Answer: freons


  
479). Match the items of list I with list II and select the correct answer using the codes given below the lists:
List - I                                    List . II
a) Tollen's reagent              1) Cupric acetate in acetic acid
b) Bardoed's reagent           2) Mixture of CuSO4 sodium citrate and Na2CO3
c) Molisch reagent              3) Ammonical silver nitrate solution
d) Benedict's solution          4) Alcoholic 2-naphthol and conc. H2SO4

Codes:
a b c d
A). 3 1 4 2
B). 2 1 4 3
C). 2 3 1 4
D). 4 3 1 2

Answer: 3 1 4 2

  
480). Match list I correctly with list ll and select your answer using the codes given below the lists
Codes:
List-I                           List-l                         List-ll
a) Antipyretics          a) Cinnabar                     1) PbS
b) Antimalarial           b) Zinc blende                 2) HgS .
c) Antibiotic             c) Galena                        3) Al2O3.2H2O
d) Antiseptic            d) Bauxite                       4) ZnS

a b c d
A). 2 1 4 2
B). 2 4 1 3
C). 1 3 4 2
D). 3 1 4 2

Answer: 2 4 1 3