GENERAL SCIENCE CHEMISTRY ONE LINERS FOR TNPSC UPSC SSC SET 036
351). Consider the following. pairs of ions or atoms :
1. Na^+ and Ne
2. Na^+ and K^+
3. K^+ and Cl^−
In which of these pairs are the ions/atoms isoelectronic with each other '?
A). 1, 2 and 3
B). 1 and 2
C). 2 and 3
D). 1 and 3
Answer: 1 and 3
352). At NTP, 5.6 litres of a gas has a mass of 60 g. The vapour density of the gas is
A). 30
B). 60
C). 120
D). 240
Answer: 120
353). A reaction between HCl and O2 is given by 4HCl+O2→2H2O+2Cl2. The equivalent weight of , HCl is equal to
A). its molecular weight
B). half of its molecular weight
C). twice its molecular weight
D). four times its molecular weight
Answer: its molecular weight
354). The pH of water at 25∘C is 7. When it is heated to 100∘C, the pH of water
A). increases
B). remains same
C). decreases
D). decreases up to 50∘C
and then it increases
Answer: decreases
355). What is the main constituent of natural gas?
A). Methane
B). Ethane
C). Butane
D). Hydrogen
Answer: Methane
356). Which one of the following is NOT a sulphate ore.
A). Barytes
B). Calamine
C). Gypsum
D). Epsom salt
Answer: Calamine
357). With reference to the chemical element with atomic number 17, consider the following statements
1. It belongs to second period in the periodic table of chemical elements
2. It forms anion with unit negative charge
Which of the statements given above is/are correct?
A). 1 only
B). 2 only
C). Both (a) and (b)
D). Neither (a) nor (b)
Answer: 2 only
358). Consider the following statements
1. Phosphorus exhibits oxidation states of 3 and 5
2. Iron exhibits oxidation state of 2 and 3
Which of the statements given above is/are correct?
A). 1 only
B). 2 only
C). Both (a) and (b)
D). Neither (a) nor (b)
Answer: Both (a) and (b)
359). Which one among the following is the most unreactive gas?
A). Hydrogen
B). Oxygen
C). Carbon dioxide
D). Nitrogen
Answer: Hydrogen
360). The conversion of Fe^++ to Fe^+++ is
A). oxidation
B). reduction.
C). ionisation
D). nuclear reaction
Answer: oxidation
1. Na^+ and Ne
2. Na^+ and K^+
3. K^+ and Cl^−
In which of these pairs are the ions/atoms isoelectronic with each other '?
A). 1, 2 and 3
B). 1 and 2
C). 2 and 3
D). 1 and 3
Answer: 1 and 3
352). At NTP, 5.6 litres of a gas has a mass of 60 g. The vapour density of the gas is
A). 30
B). 60
C). 120
D). 240
Answer: 120
353). A reaction between HCl and O2 is given by 4HCl+O2→2H2O+2Cl2. The equivalent weight of , HCl is equal to
A). its molecular weight
B). half of its molecular weight
C). twice its molecular weight
D). four times its molecular weight
Answer: its molecular weight
354). The pH of water at 25∘C is 7. When it is heated to 100∘C, the pH of water
A). increases
B). remains same
C). decreases
D). decreases up to 50∘C
and then it increases
Answer: decreases
355). What is the main constituent of natural gas?
A). Methane
B). Ethane
C). Butane
D). Hydrogen
Answer: Methane
356). Which one of the following is NOT a sulphate ore.
A). Barytes
B). Calamine
C). Gypsum
D). Epsom salt
Answer: Calamine
357). With reference to the chemical element with atomic number 17, consider the following statements
1. It belongs to second period in the periodic table of chemical elements
2. It forms anion with unit negative charge
Which of the statements given above is/are correct?
A). 1 only
B). 2 only
C). Both (a) and (b)
D). Neither (a) nor (b)
Answer: 2 only
358). Consider the following statements
1. Phosphorus exhibits oxidation states of 3 and 5
2. Iron exhibits oxidation state of 2 and 3
Which of the statements given above is/are correct?
A). 1 only
B). 2 only
C). Both (a) and (b)
D). Neither (a) nor (b)
Answer: Both (a) and (b)
359). Which one among the following is the most unreactive gas?
A). Hydrogen
B). Oxygen
C). Carbon dioxide
D). Nitrogen
Answer: Hydrogen
360). The conversion of Fe^++ to Fe^+++ is
A). oxidation
B). reduction.
C). ionisation
D). nuclear reaction
Answer: oxidation
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