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20 questions
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
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
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
Which of the following is an iron ore?
Rock salt
Haematite
Calamine
Cinnabar
Which of the following is an ore of mercury metal?
Rock salt
Cinnabar
Calamine
Haematite
The metal which is always present in an amalgam is:
iron
aluminium
mercury
magnes
Rock salt is an ore of one of the following metals. This metal is:
Mn
Na
Fe
Cu
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
1. In the given reaction,
Al2O3 + NaOH → ……X…… + H2O
What is element X?
NaAlO2
Na3Al
Na2O3
NaAl2O3
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
1. The 21st term of the AP whose first two terms are -3 and 4 is
17
137
143
-143
What is the common difference of an AP in which a18 – a14 = 32?
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
The famous mathematician associated with finding the sum of the first 100 natural numbers is:
Pythagoras
Newton
Gauss
Euclid
1. Which of the following are the nth terms of an AP.
1 + n + n2
3n2 + 5
2n – 3
None of these.
Find the 20th term of the AP whose 7th term is 24 less than the 11th term, first term being 12.
If the nth terms of the two APs: 9, 7, 5,… and 24, 21, 18,. .. are the same, find the value of n.
How many numbers lie between 10 and 300, which when divided by 4 leave a remainder 31
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.
If an = 3 – 4n, . find S20
-789
-780
-786
-760
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