1.
Which of the following is an anti-knocking compound that has been phased out in many countries so far?

2.
Argon is the third most common gas in the Earth’s atmosphere, at 0.93%. This gas is generated due to decay of which among the following isotopes in the Earth’s crust ?

3.
How can we prepare Hydrogen at our home?
1: Immersing alkali metals in water at room temperature
2: Pouring Sulphuric acid on a copper plate
3: Boiling zinc with caustic soda
4: Passing electric current through rainwater
Select the correct option from the codes given below:

4.
Consider the following matches:
1: Cassiterite – Tin
2: Halite – Sulphur
3: Guano – Phosphate
Which of the above is / are correct?

5.
Which among the following gas usually causes explosions in coal mines?

6.
After a nuclear disaster, the Strontium-90 becomes an health issue of great concern. What is the major concern about this particular isotope?

7.
Identify the element with the help of given information:
1: It was the first element to be discovered with a spectroscope
2: It remains liquid at room temperature
3: It reacts violently with water so it is kept under a layer of kerosene or mineral oil
4: It is the softest known metal on earth
Select the correct answer from options given below:

8.
Consider the following differences between metals and non-metals:
1: While the oxides of metals are basic in nature, oxides of non-metals are acidic in nature
2: While most of the metals are solid at room temperature, most of non-metals are gaseous at room temperature
Which of the above statements is/are correct?

9.
Consider the following statements about Zeolites:
1: Zeolites are a large group of natural and synthetic hydrated aluminium silicates
2: Zeolites are mainly found in low-temperature metamorphic rocks
Which of the above statements is/are correct?

10.
For most liquids, viscosity increases with increasing:
1: Pressure
2: Temperature
3: Surface tension
Select the correct option from codes given below:

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