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Chemistry Questions Answers
Gamma rays have —
zero mass and no charge
zero mass and positive charge
unit mass and zero charge
unit mass and negative charge
zero mass and no charge
Consider the following statements.
1. Plutonium-239 can be made artificially
2. Boron is used in a nuclear reactor to absorb unwanted neutrons
3. In nature, the availability of Uranium-238 is much more than that of Uranium-235
Which of these statements is/are correct?
1 only
1 and 2
2 and 3
1, 2 and 3
1, 2 and 3
The chemical name of the Aspirin used as pain reliever is
Acetyle salicylate
Acetyle salicylic acid
Methyl salicylate
Methyl salicylic acid
Acetyle salicylic acid
Chemically, soaps are —
acids
alkalies
paraffins
salts
salts
Hydrogen acts as an oxidising agent with —
Br2
Na
N2
O3
Na
Which one of the following chemical substances exists as a gas under ordinary conditions and room temperature?
CI2
CF4
CCI4
CBr4
CF4
Which one of the following is the oxidation state of oxygen in OF2?
+2
-2
+1
-1
+2
The chemical part of the dye that absorbs light and produces colour is called
neon
a chromophore
a photochrome
a pigment
a chromophore
Which one of the following pairs is correctly matched?
Uranium fission → Rutherford
Liquefaction of air → Linde
Telegraphy → Graham Bell
Laws of planetary motion → Galileo
Liquefaction of air → Linde
The Metal pins are used for holding together broken bones in modern surgery. This pin is made of
copper
aluminium
titanium
stainless steel
stainless steel