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CHEMISTRY

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

CaBr2
Cal2
Cacl2
CaF2

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

O+2
O-2
O-22
O2

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

3
1
4
2

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Chemistry
The structure of (HPO3)3 is

Tetrahedral
Linear
Octahedral
Cyclic

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Chemistry
Spontaneous change is one in there is:

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

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