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571.

Which one of the following is correct order in which the gases H2, Ne, O2 and N2 are evolved on fractional distillation of liquid air?
(a)H2, Ne, O2, N2
(b)H2, Ne, N2, O2
(c)N2, O2, Ne, H2
(d)O2, N2, H2, Ne
Comment
Answer is: B

572.

Consider the following statements
1. Nitrogen combines with metal to form nitride.
2. NO is formed on lighting.
3. HNO3 cannot be used as nitrogenous fertilizer.
Which of the statements given above are correct?
(a)Only 1
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

573.

Consider the following statements
1. Non metals are neither malleable nor ductile.
2. Non metals are bad conductor of heat and electricity except for graphite, which conduct electricity.
3. Non metals form negatively charged ions by gaining electrons when reacting with metals.
Which of the statements given above are correct?
(a)1 and 2
(b)1 and 3
(c)2 and 3
(d)1, 2 and 3
Comment
Answer is: D

574.

Consider the following statements
1. Boric acid is a mild antiseptic and is used as a food preservative.
2. Borax and other Borates are used in water treatment, Timber preservation, glass manufacture.
3. Sodium peroxoborate is an important constituent of washing powder.
Select correct statements.
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

575.

Which among the following elements is abundant on the lunar surface and holds the potential to put an end to the energy crisis of the earth?
(a)Helium I
(b)Helium II
(c)Helium III
(d)Helium IV
Comment
Answer is: C

576.

Consider the following statements
1. Euchlorine is a mixture of Cl2 and CO2.
2. Bromine gas turn starch iodine paper red.
3. Photographic plate are coated with a film of AgBr.
Which of the above is / are correct?
(a)Only 1
(b)1 and 2
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: C

577.

Consider the following statements
1. Borax is used as a flux in brazing and in silver soldering.
2. Borax is used in making enamel.
3. Borax is used in leather tanning.
Select right answer.
(a)Only 1
(b)Only 2
(c)2 and 3
(d)1, 2 and 3
Comment
Answer is: D

578.

Consider the following statements
1. Ozone is used as germicide, air and water purifiers, in making artificial, silk etc.
2. Bitterness in the onions is due to presence of sulphur compounds.
3. Helium is used in filling the tyres of the aircraft.
Which of the statements given above are correct?
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

579.

Consider the following statements
1. In laboratory, sulphur dioxide is prepared by Cu + H2SO4.
2. Carnallite is a source of sulphur.
3. Brinstone is another name of sulphur.
Which of the above is/are true about sulphur?
(a)Only 1
(b)1 and 3
(c)2 and 3
(d)1, 2 and 3
Comment
Answer is: B

580.

Consider the following statements
1. Dry ice is the solid form of CO2.
2. Dry ice is used primary as a cooling agent.
3. Water ice is colder than dry ice.
Which of the statement given above is/are correct?
(a)Only 1
(b)Only 2
(c)1 and 2
(d)1, 2 and 3
Comment
Answer is: C

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