111. When water freezes its density-
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Answer: Decreases
112. Atoms of
the same element, i. e., having the Same atomic number that differ in atomic
Weight, are called-
Answer: Isotopes
113. The metal
that is present in Photo Films is–
Answer: Silver
114. Which of
the following is not a neutral oxide ?
Answer: Sulphur
Dioxide
115. The
manufacture of iron ore Involves the process of-
Answer: Reduction
116. Which of
the following is in liquid form at room temperature ?
Answer: Francium
117. Which of
the following is used in making smoke bombs ?
Answer: Phosphorus
118. Which of
the following has the strongest Bleaching property?
Answer: Chlorine
119. The
property of a substance to absorb moisture from the air on exposure is called–
Answer: Deliquescene
120. Caustic
Soda is —
Answer: NaOH
121. Nitric
acid does not react with-
Answer: Gold
122. Brass
gets discoloured in air due to the presence of which gas in air–
Answer: Hydrogen
Sulphide
123. Which of
the following is not a bleaching agent?
Answer:
Carbon dioxide
124. Oxygen
is manufactured by the fractional Evaporation of-
Answer: Liquid
air
125. Quartz
crystals normally used in quartz clocks etc. is chemically–
Answer: Silicon
dioxide
126. The gas
usually filled in electric bulb is —
Answer: Nitrogen
127. Sodium
burns in air to give-
Answer: Sodium
peroxide
128. Which of
the following elements is non-radioactive?
Answer: Zirconium
129. Heavy
water is —
Answer: Deuterium
oxide
130. Argon
gas was discovered by-
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