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CHEMISTRY

Chemistry
Of the following compounds of calcium, the one having highest covalent character is

Cacl2
CaBr2
CaF2
Cal2

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Chemistry
Which one of the following species has the highest bond order, shortest bond length and maximum bond strength

O-22
O-2
O2
O+2

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Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

3
4
1
2

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Chemistry
The structure of (HPO3)3 is

Octahedral
Cyclic
Tetrahedral
Linear

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Chemistry
Spontaneous change is one in there is:

Increase in free energy
A lowering of free energy
An increase in Internal energy
A lowering of entropy

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