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81. Some amount of air is kept in an open container at 27oC. At what temperature the container should 3 be heated in order to eliminate 3/8 th part of the air from the container? (NTSE West Bengal, Stage-I, 2015-16)
3070
2070
1070
1000
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82. The substance which is chemically resistant, and can hold aqua regia (NTSE Karnataka, Stage-I, 2015-16)
Ceramics
Glass
Fibre
Thermosetting plastic
83. China dish is (NTSE Karnataka, Stage-I, 2015-16)
Brittle and heat resistant
Durable and heat resistant
Brittle and corrosive
Durable and non-corrosive
84. Identify the correctly matched set (1) Foot ball inflated inside and then taken outside on a winter day shrinks slightly (a) Diffusion (2) Deep sea fish die when brought when diffusion brought to the surface (b) Graham's law o (3) A balloon filled with helium will deflate a little bit everyday (c) Charle's law (4) rα =1/√d (d) Boyle's law (NTSE Karnataka, Stage-I, 2015-16)
(1) - (b), (2) - (c), (3) - (a), (4) - (d)
(1) - (d), (2) - (c), (3) - (b), (4) - (a)
(1) - (c), (2) - (d), (3) - (a), (4) - (b)
(1) - (c), (2) - (d), (3) - (b), (4) - (a)
85. Which type of bond is present between carbon-carbon atoms in acetylene? (NTSE Madhya Pradesh, Stage-I, 2015-16)
Single covalent bond
Double covalent bond
Triple covalent bond
Electrovalent bond
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