RAMAN'S CLASS XI SCIENCE QUIZ CONTEST

The property of halogens which is not correctly matched is

• F > Cl > Br > I (Ionisation energy)

• F > Cl > Br > I (Electronegativity)

• I > Br Cl > F (Density)

• F > Cl > Br > I (Electron affinity)

What makes a valence electron more attracted to the nucleus?

• Adding more energy levels makes the further from the nucleus

• There are more valence electrons in the outer shell

• There are more protons in the nucleus

• There are less protons in the nucleus

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.0500 moles

• 1.81 x 10⁴⁶ moles

  
  

• 5.00 x 10²¹ moles

• 5.00 moles

Which of these is not a sign of chemical change?

• Bubbles

• Color change

• melting

• Bad smell

______________________ determines an atom's reactivity or chemical properties.

• electron

• neutron

• proton

• valence electron

This element is the only element on the left side of the periodic table that is a nonmetal.

• Hydrogen

• Nitrogen

• Bromine

• Chlorine

Factors affecting the ionisation enery

• Atomic radius

• Effective nuclear charge

• Shielding effect

• All of the above

Number of

chromosomes in new born baby is

• 46

• 47

• 48

• 49

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

• Semilunar valves close down after the blood flows into vessels from ventricles

• AV valves open up

• Ventricular walls vibrate due to gushing in of blood from atria

• AV node receives signal from SA node

Person with blood group AB is considered a universal recipient because he has

• both A and B antigens in the plasma but no antibodies

• both A and B antibodies in the plasma

• no antigen on RBC and no antibody in the plasma

• both A and B antigens on RBC but no antibodies in the plasma