Which of the following statement is ...

Which of the following statement is CORRECT ?

At any instant ,99 % of ethane molecules have staggered and only about 1% have eclipsed conformation .

At any instant ,96% of ethane molecules have staggered and only about 4% have eclipsed condormation .

At any instant , 90% of ethane molecules have staggered and only about 10 % have eclipsed consformation .

At any instant . 95% of ethane molecules have staggered and only about 5% have eclipsed conformation .

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Choose the correct alternative : Which of the following statements is INCORRECT ?

nonmetals have 4 to 7 electrons in their outermost valace shell

nonmetals form anions by gaining electrons in their outermost shells

the oxides of nonmetals react with water to form acids

most of the nonmetals readily react with dilute acid

metals from cations by losing electrons from their outermost valence shells

metals react with oxygen to form basic oxides

most of the metals readily react with cold water to form metal hydroxides

most of the metals contain up to 3 electrons in their outermost valence shell

The ascending limb of loop of Henle Is impermeable to water.

The descending limb of loop of Henle is impermeable to water,

The ascending limb of loop of Henle is permeable to water.

The descending limb of loop of Henle is permeable to electrolytes.