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- 1. Multiple Choice
Metal M occurs in the Earth’s crust as its oxide M2O3. An alloy of this metal is used in making aircrafts. The ore of the metal M is
magnetite
haematite
bauxite
pyrolusite
- 2. Multiple Choice
Reaction between X and Y, forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?
Has high melting point
Has high melting point
Conducts electricity in Solid state
Occurs as solid
- 3. Multiple Choice
The atomic numbers of four elements P, Q, R and S are 5, 7, 10 and 15 respectively. The two elements which can react to form ionic bonds (or ionic compound) are:
A and D
A and C
B and D
B and C
- 4. Multiple Choice
Which of the following is an iron ore?
Rock salt
Haematite
Calamine
Cinnabar
- 5. Multiple Choice
Which of the following is an ore of mercury metal?
Rock salt
Cinnabar
Calamine
Haematite
- 6. Multiple Choice
The metal which is always present in an amalgam is:
iron
aluminium
mercury
magnes
- 7. Multiple Choice
Rock salt is an ore of one of the following metals. This metal is:
Mn
Na
Fe
Cu
- 8. Multiple Choice
1. The number of protons in an atom of an element A is 29 then, the number of electron in its ion A+ is:
28
29
26
27
- 9. Multiple Choice
1. In the given reaction,
Al2O3 + NaOH → ……X…… + H2O
What is element X?
NaAlO2
Na3Al
Na2O3
NaAl2O3
- 10. Multiple Choice
1. Which of the following represent the correct order of decreasing reactivity?
Mg > Al > Zn > Fe
Mg > Zn > Al > Fe
Al > Zn > Fe > Mg
Mg > Fe > Zn > Al
- 11. Multiple Choice
1. The 21st term of the AP whose first two terms are -3 and 4 is
17
137
143
-143
- 12. Fill in the Blank
What is the common difference of an AP in which a18 – a14 = 32?
- 13. Fill in the Blank
Two APs have the same common difference. The first term of one of these is -1 and that of the other is – 8. Then the difference between their 4th terms is
- 14. Multiple Choice
The famous mathematician associated with finding the sum of the first 100 natural numbers is:
Pythagoras
Newton
Gauss
Euclid
- 15. Multiple Choice
1. Which of the following are the nth terms of an AP.
1 + n + n2
3n2 + 5
2n – 3
None of these.
- 16. Fill in the Blank
Find the 20th term of the AP whose 7th term is 24 less than the 11th term, first term being 12.
- 17. Fill in the Blank
If the nth terms of the two APs: 9, 7, 5,… and 24, 21, 18,. .. are the same, find the value of n.
- 18. Fill in the Blank
How many numbers lie between 10 and 300, which when divided by 4 leave a remainder 31
- 19. Fill in the Blank
The first term of an AP is -5 and the last term is 45. If the sum of the terms of the AP is 120, then find the common difference.
- 20. Multiple Choice
If an = 3 – 4n, . find S20
-789
-780
-786
-760
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