GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 040

GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 040

391). Which one of the following elements is a metalloid ?
A). P
B). Al
C). As
D). Po

Answer: As


   
392). Analysis shows that a binary compound of X (atomic mass =10) and Y (atomic  mass = 20) contains 50% X. What is the formula of the compound ?
A). XY
B). X2Y
C). XY2
D). X2Y3

Answer: X2Y


   
393). Which one of the following pairs of correctly matched?
A). Major components of air : Nitrogen and oxygen gases
B). Components of air responsible for photosynthesis : Carbon dioxide and water  vapours
C). Components of air responsible for air pollution : Rare gases
D). Component of air essential for growth and development of plant : Nitrogen gas

Answer: Components of air responsible for air pollution : Rare gases


   
394). Why is nitrogen molecule chemically less active?
A). It has small atomic radius
B). It has high electronegativity
C). It has high dissociation energy
D). It has stable electronic configuration

Answer: It has high dissociation energy


   
395). What is the Answer:increasing order of electronegativity for the most common  oxidation States among the following elements?
A). F
B). O
C). C


Answer: C
   


396). What is the Answer:order of oxidation states of sulphur in anions
SO3^−2,S2O4^2−4 andS2O6^2−

A). S2O4^−2 < SO3^2− < S2O6^2−
B). S2O6^2− < S2O4^2− < SO3^2−
C). SO3^2− < S2O4^2− < S2O6^2−
D). S2O4^2− < S2O6^2− < SO3^2−

Answer: S2O4^−2 < SO3^2− < S2O6^2−


   
397). Yellow colour of usual nitric acid is due to the presence of which one of the  following ?
A). N2O
B). NO
C). N2O5
D). NO2

Answer: NO2



   
398). Which one of the following salts when dissolved in water makes the solution basic?
A). Sodium chloride
B). Copper sulphate
C). Ferric chloride
D). Sodium acetate

Answer: Sodium acetate

   
399). Consider the following statements .
1. Among the fertilizers used, urea contains maximum % of N
2. The mixture of calcium sulphate and calcium dihydrogen phosphate is known as  superphosphate of lime
3. Potassium magnesium sulphate is called the muriate of potash
A). 1 and 2 only
B). 2 and 3 only
C). 1 and 3 only
D). 1, 2 and 3

Answer: 1 and 2 only

   
400). Which one of the following is Answer:? Due to continuous use of calcium 
superphosphate as fertilizer in soil, the pH of soil becomes
A). more than 7
B). less than 7
C). equal to 7
D). cannot be predicted

Answer: equal to 7