An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:
1. XO3, basic
2. XO3, acidic
3. X2O3, amphoteric
4. X2O3, basic
The order of basic character of given oxides is:
1. Na2O > MgO > Al2O3 > CuO
2. MgO > Al2O3 > CuO > Na2O
3. Al2O3 > MgO > CuO > Na2O
4. CuO > Na2O > MgO > Al2O3
An element R forms the highest oxide R2O5. R belongs to:
1. 13th group
2. 15th group
3. 16 th group
4. 2nd group
Which pair of elements is chemically most similar?
1. Na, Al
2. Cu, S
3. Ti, Zr
4. Zr, Hf
Which one of the following is an amphoteric oxide?
1. SO2
2. B2O3
3. ZnO
4. Na2O
Which one is a metalloid?
1. Tin
2. Germanium
3. Sulphur
4. Carbon
The correct order of acid strength is:
1.
2.
3.
4.
Consider the following information about element P and Q :
Period number Group number
P 2 15
Q 3 2
Then formula of the compound formed by P and Q element is :
(1) PQ
(2)
(3)
(4)
Which of the following compound is most acidic?
1. 2.
3. 4.
The correct order among the following options is:
1. F > N > C > Si > Ga - Non-metallic character.
2. F > Cl > O >N - Oxidising property.
3. C < Si > P > N - Electron affinity value.
4. All of the above.